-
Steven Johnson (PSI - Paul Scherrer Institut)21/09/2026, 08:30Tutorial
The short wavelength and high photon energy of x-rays offers unique opportunities to selectively probe coherent dynamics in solids. In this talk I will give a brief overview of how x-ray diffraction and absorption spectroscopy can, in combination with selective pump pulses ranging from THz to UV, identify coherent spin and lattice dynamics on different length scales. I will present as an...
Go to contribution page -
Giacomo Ghiringhelli (Politecnico di Milano)21/09/2026, 09:10Invited
Resonant inelastic x-ray scattering (RIXS) is a premier tool for the investigation of quantum materials with strong electronic correlation. It is used to study high-energy spin excitations, charge transfer and orbital excitations, charge order and its associated fluctuations, electron-phonon coupling and hybrid modes among the listed ones. At synchrotron x-ray sources, high resolution RIXS has...
Go to contribution page -
Wei-Sheng Lee (SLAC National Accelerator Lab.)21/09/2026, 09:35Invited
Unravelling the response of microscopic degrees of freedom in photoexcited cuprates is a central challenge in ultrafast materials science. While the charge response has been extensively investigated via time-resolved (tr-) optical spectroscopy and tr-ARPES, the nonequilibrium dynamics of magnetic degrees of freedom remain largely unexplored due to the lack of a direct probe. The advent of...
Go to contribution page -
Zeinab Ebrahimpour (Elettra Sincrotrone Trieste S.C.p.A.)21/09/2026, 10:00
Silicon undergoes a sub-picosecond non-thermal melting transition when excited by intense femtosecond laser pulses. This talk demonstrates how soft X-ray absorption spectroscopy (XAS), performed at the seeded FERMI free-electron laser (FEL), effectively captures this process by resolving the ultrafast electronic structure dynamics of silicon with a temporal resolution on the 10 fs...
Go to contribution page -
Jakub Vonka (PSI - Paul Scherrer Institut)21/09/2026, 10:15
Diffraction-before-destruction schemes rely on collecting data before radiation damage develops. This condition is readily satisfied for atomic motion, making serial femtosecond crystallography highly successful in investigating photoinduced structural changes in both organic and inorganic matter. It is less clear, however, whether the condition also holds for the electronic contributions to...
Go to contribution page -
Hans Jakob Wörner (ETH Zürich)21/09/2026, 11:00
The recent capability of creating soft-X-ray attosecond pulses at free-electron lasers has opened the possibility of performing element-specific measurements of electronic dynamics on their natural time scale. I will present recent results from four user beam times at LCLS. Combining attosecond soft-X-ray pulses and circularly polarized infrared pulses, we have measured attosecond...
Go to contribution page -
Benoît Richard (Hamburg Center for Ultrafast Imaging / EuXFEL)21/09/2026, 11:25
Heisenberg uncertainty principle does not allow atoms in a molecule to have perfectly well-defined positions. Thus, each measurement of a molecular geometry probes a slightly different structure, even in the ground state. These quantum fluctuations are collective in essence: the atoms do not fluctuate independently relative to each other, but follow concerted patterns, usually described by...
Go to contribution page -
Robert Radloff (Institut für Experimentalphysik, Universität Hamburg)21/09/2026, 11:50
When X-ray fluorescence is excited by X-ray pulses with durations approaching the coherence time of the fluorescence, it encodes spatial information about the structure of the fluorescing volume and temporal information about the excitation pulse. Both spatial and temporal information can be revealed by analyzing intensity correlations in the emitted fluorescence, a method sometimes referred...
Go to contribution page -
Ulf Saalmann (Max Planck Institute for the Physics of Complex Systems)21/09/2026, 12:05
Rabi oscillations in resonantly driven two-level systems produce an Autler-Townes doublet, whose components can be selectively addressed with chirped pulses and probed via photo-electron spectra. We previously showed [1] that the ionization step depends strongly on the chirp direction — unlike rapid adiabatic passage, where near-complete population inversion occurs regardless of chirp sign....
Go to contribution page -
Suddhasattwa Mandal (Paul Scherrer Institut PSI)21/09/2026, 12:20
The investigation of light-matter interaction with weakly-bound van der Waals clusters of atoms bridges the gap between the photophysics of isolated atoms and bulk materials. When exposed to intense ultrashort laser pulses, these clusters can efficiently absorb the energy, and transform into dense, short-lived plasma. This leads to the emission of energetic electrons and highly charged ions,...
Go to contribution page -
Saikat Nandi (Institut Lumière Matière, CNRS)21/09/2026, 12:35Invited
Free-electron lasers (FELs) providing coherent light pulses ranging from mid-infrared to hard X-ray domain have opened up novel ways to study fundamental aspects of light-matter interactions. The ultrashort (10$^{-15}$ s to 10$^{-18}$ s) and ultra-intense (>10$^{13}$ W/cm$^2$) nature of these pulses allow probing the coherent nature of these interactions. One such example is the Rabi...
Go to contribution page -
Nanna Holmgaard List (KTH Royal Institute of Technology; University of Birmingham)21/09/2026, 14:00Invited
Can nonadiabatic molecular dynamics simulations predict a photochemical experiment before it is performed? I will discuss this question through the recent cyclobutanone prediction challenge, in which several theory groups predicted the photochemistry and ultrafast electron diffraction signal following 200 nm excitation. The results showed that current methods can often capture the main...
Go to contribution page -
Dr Xinhua Xie (PSI - Paul Scherrer Institut)21/09/2026, 14:25Invited
Photodissociation of cyclobutanone following 200 nm excitation has been extensively studied as a model system for nonadiabatic dynamics in cyclic ketones. Previous studies have shown that excitation populates the S₂ state, followed by rapid internal conversion through S₁ to the ground state S0 via conical intersections. The resulting vibrationally hot ground-state molecules undergo ring...
Go to contribution page -
Seonggon Lee (ETH Zurich)21/09/2026, 14:50
A central tenet of attochemistry is charge-directed reactivity: ionization launches a valence hole whose motion and eventual localization across a molecule can predetermine the ensuing dynamics [1]. Yet, despite successes in capturing attosecond electron dynamics, their causal link to reaction dynamics, particularly in liquid solutions, has remained experimentally elusive. Concentrated aqueous...
Go to contribution page -
Elisa Pauline Pascale Collet (IMDEA Nanoscience)21/09/2026, 15:05
Semiconductor CuInS$_2$ (CIS) quantum dots (QDs) are highly promising for optoelectronic applications for their low toxicity, excellent charge-transport properties, and remarkable photoluminescence features. To develop our fundamental understanding of nanoscale photo-physics and optimize the design of devices, several mechanisms of recombination in CIS QDs have been proposed, modelling the...
Go to contribution page -
Antoine Sarracini (PSI - Paul Scherrer Institut)21/09/2026, 15:20
Proton-coupled electron transfer (PCET) is a fundamental class of photochemical reactions in which the absorption of light triggers both charge transfer and a change in hydrogen bonding on the excited state potential surface in molecules where a hydrogen donor and acceptor group are in close proximity to one another. The distinct proton and electron transfer steps may occur sequentially or...
Go to contribution page -
John Bozek (Synchrotron SOLEIL)21/09/2026, 16:00
A Scienta EW4000-6kV hemispherical analyzer has been commissioned at the SQS instrument of the European XFEL. Conceived as a high-resolution electron spectrometer for gas phase studies, TRESOR was installed and first used at euXFEL in spring 2026. With a delay line anode on the detector, the spectrometer can take advantage of the high repetition rate available at euXFEL to overcome problems...
Go to contribution page -
Eloisa Manetti (PSI - Paul Scherrer Institut)21/09/2026, 16:01
Abstract: Understanding X-ray induced dynamics is relevant for a broad field of applications, ranging from X-ray imaging of materials, to medical application of X-rays. Due to the large amount of energy imparted by an absorbed X-ray photon, the triggered relaxation processes typically take place on ultrafast time scales. Water molecules in the gas phase have been studied at the Maloja...
Go to contribution page -
Dr Vladimir Lipp (European XFEL)21/09/2026, 16:02
Femtosecond laser direct writing (LDW) using ultraviolet, visible or infrared lasers is a maskless subtractive manufacturing approach that is widely used for precision surface processing due to the strong spatial confinement of laser energy it provides and the minimal collateral damage it causes. Here, we present a conceptual scheme for high-precision machining of semiconductor materials using...
Go to contribution page -
81. Status and future prospects of FHI FEL: A two-color dual-oscillator infrared free-electron laserWieland Schöllkopf (Fritz-Haber-Institut der Max-Planck-Gesellschaft)21/09/2026, 16:03
We report on the design, performance and applications of FHI FEL, a dual-oscillator two-color infrared free-electron laser which we operate at the Fritz Haber Institute (FHI) in Berlin, Germany [1]. It includes a 50 MeV normal-conducting linac supplying two oscillator FEL branches; a mid-infrared (MIR) FEL (commissioned in 2013) and a new far-infrared (FIR) FEL. What makes the FHI FEL unique...
Go to contribution page -
Tom von Scheven (University of Rostock)21/09/2026, 16:04Poster
Single-shot coherent diffractive imaging (CDI) enables the capture of a full diffraction image of a nanostructure using a single flash of XUV or X-ray light. The resulting scattering image encodes both the geometry and the optical properties of the target. So far, this method has mainly been employed for ultrafast structural characterization [1]. However, CDI can also be utilized to resolve...
Go to contribution page -
Maura Münier21/09/2026, 16:05
Understanding the dynamics underlying the interaction of ultrashort intense laser pulses with metals is of key interest for advancing controlled laser-based material processing. The irradiation of metal targets with intense laser pulses triggers a variety of physical processes, including the initial laser heating of the electrons, energy transfer between the electronic and lattice system and...
Go to contribution page -
Sang Han Park (Pohang Accelerator Laboratory, Pohang University of Science and Technology (POSTECH))21/09/2026, 16:06
Understanding charge carrier dynamics at p–n heterojunctions is essential for designing high-efficiency photo-catalysts. Here, we investigate ultrafast charge transfer pathways in a layered CuO/TiO2 heterostructure using time-resolved soft X-ray absorption spectroscopy (tr-XAS) with PAL-XFEL for probing transient electronic structure with elemental and orbital sensitivity.
Go to contribution page
By tracking... -
Cagri Erciyes (Max Planck Institute for Nuclear Physics)21/09/2026, 16:07
Free-electron lasers (FELs) produce intense, coherent light pulses spanning the infrared to hard X-rays, enabling ultrafast studies of matter on atomic scales. Extending FEL operation toward gamma-ray photon energies requires extremely high peak currents, yet in conventional electron beams such compression generates a steady space-charge field that distorts the beam energy and quenches...
Go to contribution page -
21/09/2026, 16:08Invited
Unravelling the response of microscopic degrees of freedom in photoexcited cuprates is a central challenge in ultrafast materials science. While the charge response has been extensively investigated via time-resolved (tr-) optical spectroscopy and tr-ARPES, the nonequilibrium dynamics of magnetic degrees of freedom remain largely unexplored due to the lack of a direct probe. The advent of...
Go to contribution page -
Mr Ruslan Kurta (European XFEL)21/09/2026, 16:09Poster
Fluctuation X-ray scattering (FXS) offers a complementary approach to imaging of nano- and bioparticles at X-ray free-electron lasers (XFELs) by extracting structural information from statistical moments of large ensembles of measured scattering patterns.
Go to contribution page
This poster reviews basic concepts behind FXS from the perspective of rotational invariants. Further more, we employed our software suite... -
Mikako Makita (European XFEL GmbH)21/09/2026, 16:10Poster
We present our pulse-multiplexing studies – one of the mid-term strategies at the European X-ray Free Electron Laser (European XFEL). The activity is motivated by hallmark XFEL properties—ultra-high intensity and a high degree of spatial coherence [1-2]—as well as a “MHz repetition rate” that can deliver approximately 400 pulses per each undulator-branch, at 220 ns intervals within a 10 Hz...
Go to contribution page -
Guy Matmon (PSI - Paul Scherrer Institut)21/09/2026, 16:11
Abstract:
Go to contribution page
Short, coherent pulses from infrared free electron lasers has been used extensively for studying population dynamics, and to a lesser extent coherence, of bound carrier states in semiconductors. Here we focus specifically on the hydrogen atom-like states of single donors and acceptors. Several challenges beset characterisation: the ladder of excited bound states is closely spaced in... -
Juliette Leroux (University of Hamburg)21/09/2026, 16:12
Chirality is a fundamental structural feature of many molecules and plays an important role in biological processes as well as in chemical synthesis via lock-and-key-type interactions. Although macroscopic methods exist to determine the enantiomeric excess of chiral molecules in chemical and biological environments, a full microscopic understanding of chirality-specific responses of individual...
Go to contribution page -
Prof. Fernando Martin (IMDEA)22/09/2026, 08:30Tutorial
-
Arikta Saha (Elettra Sincrotrone Trieste)22/09/2026, 09:10
Abstract: The phase-locked extreme ultraviolet (XUV) harmonic comb generated by the UV-seeded free-electron laser (FEL) FERMI provides intense attosecond pulse trains (APTs) with controllable temporal waveforms [1]. The high degree of coherence, along with the tunability in wavelength and harmonic intensity of a seeded FEL, makes these APTs ideally suited for scanning across spectral features...
Go to contribution page -
Loïc Lucien Cédric Bassement (PSI - Paul Scherrer Institut)22/09/2026, 09:25
Development of new machine modes at large scale facilities like Free-Electron Lasers (FEL) opened new experimental possibilities to study X-ray induced dynamics. With the “fresh slice method”, two intense femtosecond X-ray pulses can be produced with independent and tunable photon energy and time delay. This beam mode can be used in pump-probe schemes, exploiting the high target specificity...
Go to contribution page -
Gergana D. Borisova (Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany; Department of Physics, Lund University, 221 00 Lund, Sweden;)22/09/2026, 09:40
The helium atom is the ideal prototype system to investigate the role of the initial state and its electronic correlation in the ionization process with high experimental and theoretical accuracy. Here, we present an XUV-pump-IR-probe coincidence spectroscopy study of strong-field ionization from doubly excited states (DES) in helium, with a particular focus on the role of dynamic electron...
Go to contribution page -
Felix Ritzkowsky (DESY)22/09/2026, 10:05
Free-electron lasers (FELs) are opening new regimes of light–matter interaction[1-3], and the advent of spectro-temporal shaping of intense XUV to X-ray pulses[4,5] is enabling quantum-control and non-perturbative photoexcitation in a previously inaccessible spectral range[6,7]. Rapid adiabatic passage (RAP) is a particularly robust quantum control protocol, providing efficient photoexcitation...
Go to contribution page -
Thomas Lane (DESY)22/09/2026, 11:00Tutorial
-
Kalyani Chordiya (University of Hamburg)22/09/2026, 11:40
Understanding the ultrafast response of proteins and large biomolecules to intense X-ray pulses is essential for advancing their structural and dynamical studies. A critical question for larger systems (>1000 atoms) is whether a complete Coulomb explosion can develop before electron trapping suppresses it. In this work, we examine the competitive dynamics between Coulomb explosion and electron...
Go to contribution page -
Jasper van Thor (Imperial College London)22/09/2026, 11:55Invited
Time-resolved X-ray crystallography requires intense, short laser pulses to achieve ultrafast time resolution. It is currently not known to what extent double optical excitation as a result of intense laser illumination, can contribute to measured signals. We present a separation of weak and strong response from pump-probe data of photoactive yellow protein crystals collected at a single...
Go to contribution page -
Dusan Turk (Jozef Stefan Institute)22/09/2026, 12:20Oral
Analysis of diffraction data from time-resolved experiments suggests
incoherent addition of populations of statesCurrent refinement of crystal structures with excited-state
Go to contribution page
populations commonly relies on extrapolated data sets (Schmidt et al.,
2003; De Zitter et al., 2022). These are derived from differences
between diffraction data collected from crystals containing mixed
ground-... -
Filipe Maia (Uppsala University)22/09/2026, 12:35Invited
The quest to image single molecules played a crucial role in the development of X-ray free-electron lasers (XFELs). The ultra-bright, ultrafast pulses of XFELs enable the recording of a particle’s diffraction pattern before radiation damage destroys it—a concept first proposed by Neutze et al. ([Nature, 2000][1]) and experimentally demonstrated at FLASH over a decade ago ([Chapman et al.,...
Go to contribution page -
Roman Mankowsky (PSI - Paul Scherrer Institut)22/09/2026, 14:00Invited
-
Tommaso Venanzi (TU Dresden)22/09/2026, 14:25Invited
Coulomb-bound quasiparticles, such as excitons and trions in transition metal dichalcogenide monolayers, feature high binding energies on the order of 100s of meV, exhibit strong light-matter coupling, and can store quantum information in spin-valley degrees of freedom. Realizing strategies for external control of the excitonic states on ultrafast timescales thus emerged as an important avenue...
Go to contribution page -
Nidhi Adhlakha (Assistant Professor, National Institute of Technology Karnataka, Surathkal -575025)22/09/2026, 14:50
Black Phosphorous (BP) represents a very unique two dimensional (2D) material due to its tunable infrared band gap and its anisotropic conduction properties. It has been emerged as an attractive material with a huge potential for future nanoelectronics and nanophotonic applications [1]. BP also shows the optical signatures of pressure induced Lifshitz transition from a semiconductor to a Dirac...
Go to contribution page -
Dorothee Mader (Fritz-Haber-Institut der Max-Planck-Gesellschaft)22/09/2026, 15:05
In this talk infrared-visible sum-frequency generation (SFG) spectro-microscopy using the FHI-FEL is introduced. This method combines benefits from second harmonic generation imaging such as local information on structural symmetry and benefits from sum-frequency generation spectroscopy such as details of the atomic structure and bonding via vibrational resonances.
We demonstrate an...
Go to contribution page -
Naman Agarwal (FERMI FEL, Elettra Sincrotrone Trieste, Trieste, Italy)22/09/2026, 15:20
Nanoscale ultrafast all-optical tuning of magneto-acoustic devices is of significant scientific and technological interest, particularly in areas of energy efficient data storage and information processing. Ultrafast generation and control of high frequency nanoscale surface acoustic waves (SAWs) in the first order magneto structural phase transitions can be used to precisely control such...
Go to contribution page -
Angel Rodriguez Fernandez (Diamond Light Source Ltd.)22/09/2026, 15:35
Material processing with femtosecond lasers has attracted enormous interest over the past decades due to the countless potential applications in technology and industry. One key aspect of their performance is the reduced thermal load, enabling the fabrication of smaller and sharper feature sizes, as well as enabling surface and sub-surface processing of transparent materials. This advantage...
Go to contribution page -
Alexander Paarmann (Fritz-Haber-Institut der Max-Planck-Gesellschaft)22/09/2026, 16:30Invited
Phonon polaritons are hybrid light-matter quasiparticles in polar crystals that enable waveguiding of light on length scales much smaller than the photon wavelength [1]. Here, we introduce the hafnium dichalcogenides HfS2 and HfSe2 as new van der Waals materials that supports phonon polaritons in the terahertz (THz) spectral range. Using THz near-field optical microscopy coupled to the...
Go to contribution page -
Dr Omkar Rambadey (Max Planck Institute for the Structure and Dynamics of Matter)22/09/2026, 16:55
The melting of metallic nanoparticles under optical excitation has been one of the puzzling processes, wherein photoexcited electrons deposit their energy into the lattice via electron-phonon coupling on sub-picosecond time scales and consequent phonon dynamics takes over. While previous attempts [1,2] on gold nanoparticles have elucidated the electronic dynamics and the shape transformations,...
Go to contribution page -
Karina Kazarian (PSI - Paul Scherrer Institut)22/09/2026, 17:10
We present the status and capabilities of the pulsed magnetic field setup that is currently being comissioned at the Cristallina-Quantum experimental station of the Aramis hard X-ray beamline branch at SwissFEL. The setup is based on a split-pair coil magnet, providing a vertical magnetic field with wide horizontal scattering angle access and compatible with cryogenic sample environments. The...
Go to contribution page -
Rasmus Buchin (CFEL/UHH)22/09/2026, 17:35
Ultrafast and intense X-ray free electron laser (XFEL) pulses can visualize non-equilibrium dynamics on the femtosecond time scale with high spatial resolution at single nanoparticle (NP) level . Single exposure coherent diffraction imaging (CDI) of individual nanospecimen has been so far limited to a few nanometers. The limiting factor is sample bleaching through photo-ionization and...
Go to contribution page -
Alessandra Milloch22/09/2026, 17:50
Thermoelastic properties at the nanoscale play a central role in condensed matter physics and nanostructured materials, yet remain challenging to probe experimentally. Extreme ultraviolet (EUV) transient grating (TG) technique has recently enabled access to these dynamics at selected wavevectors in the tens-of-nanometers range, providing insight into nanoscale thermal transport and acoustic...
Go to contribution page -
V. N. Strokov (Center of Photon Science, Paul Schererr Institute, Villigen-PSI, Switzerland)22/09/2026, 18:05
We report pilot time-resolved X-ray photoemission spectroscopy (tr-XPS) experiments performed at the SXP (Soft X-ray Photoemission) instrument [1] of the European XFEL. The samples were pumped with 1.5 eV laser pulses at fluences up to 2 mJ/cm⁻² and probed with XFEL pulses of 1 keV with a fluence of ~5 μJ/cm⁻², a temporal resolution of ~60 fs and an energy resolution of ~100 meV. We explored...
Go to contribution page -
Martin Weik (IBS)23/09/2026, 08:30Tutorial
Photoreceptor proteins utilise the absorption of light to elicit a biological response in a variety of processes, including vision, circadian rhythms and plant development. The focus of current research is the understanding of how the initial photochemical events at the receptor's chromophore funnel through space and time into the desired photobiological event.
Go to contribution page
In order to visualise... -
Kirill Kovalev (European Molecular Biology Laboratory)23/09/2026, 09:10Invited
Abstract:
Go to contribution page
Proton transfer underlies enzymatic catalysis, ion transport, and energy conversion across biology, often involving short, strong H-bonds in which the proton is delocalized between two functional groups. Such low-barrier H-bonds (LBHBs) have been shown in protein active sites, but their dynamics are difficult to capture in this environment because LBHBs unfold on ultrafast... -
Katerina Dörner (European XFEL)23/09/2026, 09:35Oral
The European XFEL (EuXFEL) facilitates high-resolution structural studies of biological systems at MHz pulse repetition rates. Serial femtosecond crystallography (SFX) - next to scattering and imaging techniques - is the most common approach. Time-resolved structural studies are enabled with optical pump-probe or mixing experiments. To accommodate the MHz repetition rate, sample delivery...
Go to contribution page -
Briony Yorke (School of Chemistry)23/09/2026, 09:50Invited
The eye lens has evolved to retain transparency throughout the organismal lifespan in the absence of cellular regeneration. The crystallin proteins that constitute the lens remain folded and soluble for more than 50 years in humans despite daily exposure to ultraviolet (UV) radiation. Human γD-crystallin (HGD) is one of the principal structural proteins of the lens. Long regarded as a passive...
Go to contribution page -
Jörg Standfuss (PSI - Paul Scherrer Institut)23/09/2026, 10:15Oral
Jörg Standfuss
representing collaborators at PSI Center for Life Sciences, PSI Center for Photon Science, LeadXpro AG, Institute for Advanced Chemistry of Catalonia, Stanford Cancer Institute, SLAC National Accelerator Laboratory, and University of Zurich
Abstract:
Go to contribution page
The advent of next-generation synchrotrons and X-ray free-electron lasers enables time-resolved structural biology at... -
Joost Bakker (HFML-FELIX & Radboud University)23/09/2026, 11:00
Gas-phase metal clusters can act as idealized model systems for the active sites of more complex catalysts, allowing for studies aimed at a fundamental understanding of metal-molecule interactions. In these experiments, we focus on understanding the adsorption of simple molecules on the model catalysts and establish the influence of local geometric and electronic structure as well as elemental...
Go to contribution page -
Björn Senfftleben (ETH Zürich)23/09/2026, 11:25
Achieving a molecular-level understanding of complex chemical reactions requires a detailed mapping of their elementary dynamics. Among these, charge transfer during two-body molecular dissociation has been investigated in pioneering experiments as a function of the distance between the two separating fragments (see e.g., Erk et al. 2014 and Schnorr et al. 2014). Here we build upon a study by...
Go to contribution page -
Paola Di Pietro (Elettra-Sincrotrone Trieste)23/09/2026, 11:40
Ultrafast nonlinear terahertz (THz) spectroscopy is applied at the TeraFERMI beamline of the Italian FERMI free electron laser (FEL), where intense (multi MV/cm peak field), broadband (up to 4 THz) and ultrashort (< ps) THz pulses are generated by coherent transition radiation from the relativistic electron bunches of the FEL [1].
Go to contribution page
The beamline allows addressing the THz nonlinear properties of... -
Jae Hyuk Lee (Pohang Accelerator Laboratory)23/09/2026, 11:55
The Femtosecond X-ray Liquidography (FXL) endstation at PAL-XFEL is dedicated to femtosecond X-ray studies of solution-phase and condensed-phase samples. It combines femtosecond XFEL pulses with synchronized optical laser excitation and supports time-resolved X-ray scattering, X-ray absorption spectroscopy, X-ray emission spectroscopy, and time-resolved crystallography over an X-ray energy...
Go to contribution page -
Eleonora Spurio (CNR)23/09/2026, 12:10
Metal oxides exhibit remarkable catalytic properties that make them promising candidates for efficient photoelectrochemical applications. Carrier lifetime and mobility play a key role in determining their catalytic performance, making it crucial to investigate the ultrafast electronic and structural dynamics induced by photoexcitation. In CeO₂, functionality relies on the reversible exchange...
Go to contribution page -
Andre Al Haddad (PSI - Paul Scherrer Institut)23/09/2026, 12:25Oral
The K edges of light elements reveal the crucial role of the ligands in mediating ultrafast decay cascades. In this talk, I will present our investigation of a prototypical spin crossover complex, iron II trisbipyridine. Upon optical excitation, the ensemble of molecules undergoes a cascade of relaxation processes starting from the singlet states, intersystem crossing to the triplet state, and...
Go to contribution page -
Tais Gorkhover23/09/2026, 14:00
Coherent diffractive imaging of individual nanoparticles at FELs faces fundamental constraints due to rapid, dose-induced sample bleaching. This talk presents the first X-ray diffraction imaging experiments on individual nanoparticles utilizing intense, sub-femtosecond (sub-fs) pulses. At extreme peak power densities up to 10^20 W/cm², our data indicates that sub-fs exposures unlock novel...
Go to contribution page -
Hankai Zhang (EPFL)23/09/2026, 14:25
Abstract
Go to contribution page
Ultrafast imaging enables the investigation of nanoscale dynamics in single particles using individual X-ray pulses. Accurate interpretation of such images requires understanding the strong interaction between the X-ray pulse and the sample, particularly when the electronic structure effects is of interest. We investigate ultrafast X-ray–induced dynamics in sodium iodide (NaI)... -
Zhou Shen (Max-Planck-Institut für Struktur und Dynamik der Materie)23/09/2026, 14:40
The high repetition rate of X-ray free-electron lasers (XFELs) enables the collection of massive single-particle diffraction datasets, providing unprecedented opportunities to investigate nonequilibrium structural dynamics in nanoparticle ensembles. Here, we apply XFEL single-particle imaging to large ensembles of gold nanoparticles undergoing nonequilibrium processes including growth and...
Go to contribution page -
Paul Tuemmler (University of Rostock)23/09/2026, 14:55
Single-shot coherent diffractive imaging with intense XUV and soft X-ray pulses offers the exciting possibility of retrieving both the 3D structure and optical properties of nanoscale objects from a single diffraction pattern. Achieving this, however, requires an accurate description of the underlying wide-angle scattering and propagation effects, which are significantly more complex than in...
Go to contribution page -
Boris Sorokin (University of Augsburg, Helmholtz-Zentrum Berlin, PSI - Paul Scherrer Institut)23/09/2026, 15:10
Synchrotrons and X-ray free electron lasers (XFEL) are intrinsically pulsed sources of light, which makes them ideal tools for time-resolved measurements. A wide range of ultrafast X-ray imaging techniques have been well established, and are now being widely utilized at numerous facilities worldwide. However, all of these methods require an averaging over an extended period of time (or a large...
Go to contribution page -
Alessandro Colombo (ETH Zurich)23/09/2026, 15:25
Capturing movies of ultrafast processes in nanomatter has been a driving force for the development of X-ray Free Electron Lasers (XFELs). Since the first demonstration of Coherent Diffraction Imaging (CDI) at an XFEL facility [1], the technique has moved from a niche proof-of-concept to a well-established, standard tool, allowing for snapshot imaging of fragile and transient structures, from...
Go to contribution page -
Alexei Maznev (MIT)23/09/2026, 16:30Invited
Laser-induced transient grating (TG) spectroscopy, in which two crossed short laser pulses produce a spatially periodic material excitation whose dynamics are monitored via diffraction of a time-delayed probe pulse, is a well-established optical technique used to study a wide range of phenomena. The extension of this technique into the EUV and x-ray spectral ranges accomplished in the past...
Go to contribution page -
Ana Sofia Morillo Candas (Max Planck Institute fur Kernphysik)23/09/2026, 16:55
We present the experimental demonstration of coherent four‑wave mixing in the X‑ray regime (XFWM). We first demonstrate the process in neon near the K‑edge (870 eV) using single broadband SASE pulses from the Swiss Free Electron Laser [1]. A square spatial mask splits the incoming beam into three cut‑out beams arranged in a ‘folded BOX’ geometry, enabling background‑free signal detection. The...
Go to contribution page -
Peter Miedaner (MIT)23/09/2026, 17:20
Transient grating with EUV and soft X-rays has recently emerged as a powerful way to excite and detect nanoscale dynamics. Short penetration depths at these wavelengths have generally limited these experiments to thin films in a transmission geometry. In reflection, near normal incidence, the signal is entirely dominated by surface displacements. Here, we show that soft X-ray TG in a grazing...
Go to contribution page -
Christina Boemer (DESY)23/09/2026, 17:35Invited
Spontaneous parametric down-conversion (PDC) of photons is a gateway into the quantum realm – thoroughly studied in nonlinear optics and ubiquitously used to generate non-classical states of light.
Go to contribution page
Here, we present a study of the effect in the x-ray regime and report the observation of a novel hybrid-state of light and matter that emerges from this fundamental nonlinear process. In our... -
Nadia Berndt (MIT Chemistry)23/09/2026, 18:00
Ever brighter x-ray laser sources give rise to the possibility of using ultrafast hard x-rays to directly drive nanoscale lattice and magnetic dynamics. Recently, hard x-ray excitation of phonons was demonstrated using the x-ray transient grating (XTG) technique [1], but driving of magnetic dynamics in this regime has remained unexplored. In this work, we use XTG to excite magnetic precession...
Go to contribution page -
Prof. Ichiro Inoue (The University of Tokyo)23/09/2026, 18:15
Tight focusing of XFEL pulses is a straightforward and effective approach to increase their fluence and peak intensity. At most XFEL facilities, nanofocusing optics are treated as permanent beamline components and installed in dedicated vacuum chambers to minimize environmental disturbances such as mechanical vibrations and thermal fluctuations. However, their fixed installation often limits...
Go to contribution page -
Gopika Paduvil (Albert-Ludwigs-Universität Freiburg)23/09/2026, 18:50
Abstract: Intense attosecond pulse trains generated by the seeded FEL FERMI have been temporally characterized using a covariance-based approach with single-shot photoelectron spectra [1,2]. Due to the high intensities achieved by FEL pulses, such attosecond pulse trains are ideal candidates for investigating nonlinear processes and, eventually, controlling them by varying the phase of...
Go to contribution page -
Claudio Cirelli (PSI - Paul Scherrer Institut)23/09/2026, 18:55
Understanding photoinduced structural and electronic dynamics in chemical and biological systems requires experimental tools with femtosecond time resolution and sensitivity at the atomic scale. In this context, we describe the Alvra instrument at the Swiss X-ray free-electron laser (SwissFEL), which was developed to address these challenges by combining time-resolved X-ray spectroscopy and...
Go to contribution page -
Jan Leutloff (Universität Hamburg)23/09/2026, 19:00Poster
Self-assembly of gold nanoclusters produces nano- to mesoscale structures with enhanced optical and electronic properties, making them promising building blocks for functional nanomaterials and plasmonic devices. These properties are commonly investigated using spectroscopic techniques, which typically provide only indirect information about the underlying structure. Directly characterizing...
Go to contribution page -
Mathias Sander (PSI - Paul Scherrer Institut)23/09/2026, 19:05Poster
Experimental Setup of the Grazing Incidence chamber
Go to contribution page -
Bill Francesco Pedrini (PSI - Paul Scherrer Institut)23/09/2026, 19:10
Traditionally, neutron scattering has been the main technique to study spin order and excitations, such antiferromagnetism of LiErF4 [1]. However, exceptional improvements in terms of brilliance of accelerator-based X-ray sources have elevated X-ray scattering as an effective complementary technique that enables elemental sensitivity via electronic resonance effects, as well as the ability to...
Go to contribution page -
Rajan Mishra (UGC-DAE Consortium For Scientific Research,Indore M.P. India)23/09/2026, 19:20
Oxygen vacancies are not merely defects in materials but play a crucial role in determining their mechanical, optical, electrical, and catalytic properties.[1] Understanding and controlling these vacancies is essential for the development of advanced energy conversion and storage technologies.[2] SrCoO₂.₅ exhibits a brownmillerite structure with alternating layers of metal–oxygen octahedra and...
Go to contribution page -
Adrian Rutschmann (PSI - Paul Scherrer Institut)23/09/2026, 19:25
We have developed an all-electronic setup for synchronizing X-ray free-electron laser (XFEL) pulses in phase with microwave pulses at carrier frequencies up to 40 GHz, achieving sub-picosecond timing jitter. We demonstrate the capabilities of this synchronization scheme performing X-ray-detected ferromagnetic resonance experiments at an XFEL. In this experiment, conducted at the Maloja...
Go to contribution page -
Dadian Guo (The University of Tokyo Graduate School of Frontier Sciences)23/09/2026, 19:30Poster
Over the past decade, intense femtosecond X-ray pulses generated by XFELs have greatly advanced structure determination of radiation-sensitive samples through the “diffraction-before-destruction” approach. The ultrashort duration of XFEL pulses allows diffraction data to be collected before significant structural changes occur, thereby enabling determination of atomic structures beyond the...
Go to contribution page -
Carole Michellod (ETH Zurich)23/09/2026, 19:35
Affiliation: Nanostructures and Ultrafast X-Ray Science, Laboratory for Solid State Physics, ETH Zurich
Email: cmichellod@student.ethz.chAuthors : Carole Michellod, Indrani Dey, Isabelle Bolliers, Alessandro Colombo, Ehsan
Go to contribution page
Hassanpour-Yesaghi, Linos Hecht, Bruno Langbehn, Jannis Lehmann, Mario Sauppe,
Nora Sigrist, Janick Schrodt, Lea Schuepke, José Gòmez Torres, Frederic Ussling,... -
Ichika Harima (Department of Applied Physics, School of Engineering, The University of Tokyo)23/09/2026, 19:45
Attosecond science with ultrafast optical pulses has revolutionized our understanding of electron dynamics, enabling direct observation of charge migration, electron correlation effects, and field-driven phenomena on their intrinsic timescales. Recent advances in electron accelerator technologies at XFEL facilities have extended attosecond techniques into the hard X-ray regime [1,2], allowing...
Go to contribution page -
Dr Balazs Nagyilles (DESY)23/09/2026, 19:50
The pulse-length preserving double grating monochromator beamline FL23 at the XUV/soft x-ray free-electron laser FLASH went into user operation beginning of 2024. The beamline is designed to work in the soft X-ray regime covering the spectral range between 60-950 eV with a spectral resolving power of approximately 2000 [1]. A flexible microfocus at the experimental station is provided by a...
Go to contribution page -
Ralf Röhlsberger (Helmholtz Institut Jena)24/09/2026, 08:30Invited
the abstract, based on the word template given on this website, is provided in the attachment section of this page.
Go to contribution page -
Dr Miriam Gerharz (Max-Planck-Institut für Kernphysik)24/09/2026, 09:10Invited
Mössbauer spectroscopy is well established across the natural sciences. The exceptionally narrow linewidths of Mössbauer nuclei (e.g. 4.7 neV for Fe57) also make them a promising platform for x-ray quantum optics. These narrow transitions feature long lifetimes, but on the other hand also allowed to only study single excitations for decades. This limitation changed with the advent of X-ray...
Go to contribution page -
Carlo Callegari (Elettra - Sincrotrone Trieste S.C.p.A.)24/09/2026, 09:35
FERMI is the seeded free electron laser (FEL) facility in operation for international users within the Elettra – Sincrotrone Trieste research center. The adoption of a seeded design provides FERMI with the desirable qualities one expects from a laser: reproducibility, stability, spectral purity, synchronization, spatial and temporal coherence [1]. The latter implies that the electric field of...
Go to contribution page -
Dr Wojciech Błachucki (Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland)24/09/2026, 10:00
X-ray free electron lasers (XFELs) have revolutionized the study of matter, yet traditional optical pump - X-ray probe spectroscopy remains limited by arrival time jitter and probe pulse duration, often restricting temporal resolution to tens of femtoseconds. While current methods rely mainly on spectral changes and momentum transfer the ongoing development of time tools, for instance THz...
Go to contribution page -
Dr Daniel Charles Haynes (PSI - Paul Scherrer Institut)24/09/2026, 10:15
Attosecond pulse modes at XFELs, such as those employing slotted-spoiler devices, low bunch charge, or photocathode shaping, are increasingly available at facilities around the world [1-3]. The intensity and photon energy of attosecond XFEL pulses greatly exceed those of conventional attosecond HHG pulses, granting the potential to study a much wider range of systems and processes than have...
Go to contribution page -
Harald Sinn (EuXFEL), Patrick Rauer (Deutsches Elektronen-Synchrotron DESY)24/09/2026, 11:00Invited
Cavity-based X-ray Free Electron Lasers (CBXFELs) promise to transform the field of hard X-ray science by delivering radiation with exceptional brilliance, stability,and full three-dimensional coherence. At the European XFEL, we have recently achieved lasing with multi-pass gain in a proof-of-concept CBXFEL featuring a 132.8m round-trip hard X-ray cavity using diamond crystals in Bragg...
Go to contribution page -
Dr Zhaoheng Guo (École Polytechnique Fédérale de Lausanne (EPFL), PSI - Paul Scherrer Institute)24/09/2026, 11:25
We demonstrate the generation of both soft and hard X-ray attosecond pulses at SwissFEL, based on the temporal shaping of the photocathode laser pulses [1]. Through flexible bunch compression schemes, the electron beam current profile evolves from a double-Gaussian shape with 10 ps duration into a femtosecond-scale isolated high-current spike in the core of a tens-of-femtosecond-long electron...
Go to contribution page -
Akash Chandra Behera (Fritz Haber Institute of the Max Planck Society)24/09/2026, 11:40
The infrared free-electron laser (IR-FEL) at the Fritz Haber Institute recently commissioned a two-color upgrade, enabling simultaneous lasing with two IR FEL oscillators with independently tunable wavelength. This is realized by employing a high-frequency (500 MHz) kicker cavity to feeding alternating electron bunches from within the 1 GHz bunch train into the two separate IR FEL oscillators....
Go to contribution page -
Joerg Hallmann (European XFEL)24/09/2026, 11:55
-
Amirmostafa Amirjani (Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium)24/09/2026, 12:15
Metasurfaces, planar arrays of engineered subwavelength structures, enable unprecedented control over light’s amplitude, phase, and polarization, driving innovations in imaging, sensing, and active nanophotonics. For the optical characterization of these structures, tabletop optical parametric oscillators (OPOs) and amplifiers (OPAs) are widely used, as they provide rich information on linear...
Go to contribution page -
Thomas Cowan (HZDR)24/09/2026, 12:30Tutorial
-
Harald Sinn (EuXFEL)24/09/2026, 12:50
-
Marc Guetg24/09/2026, 14:00
-
Markus Gühr (FLASH)24/09/2026, 14:10
-
Daria Gorelova24/09/2026, 14:30Invited
-
Eugenio Ferrari (Deutsches Elektronen-Synchrotron DESY)24/09/2026, 14:50
-
Peter Susnjar (ELLETRA)24/09/2026, 15:10Invited
The FERMI FEL, as an externally seeded facility, provides extraordinary temporal coherence, pulse-to-pulse stability, and spectral purity, overcoming the stochastic limitations inherent in self-amplified spontaneous emission (SASE). However, its maximum photon energy is primarily limited by the achievable harmonic multiplication before energy spread and microbunching degradation disrupt the...
Go to contribution page -
24/09/2026, 15:30
-
Philipp Dijkstal (PSI - Paul Scherrer Institut)24/09/2026, 16:45
-
Cornelius Strom (DESY)24/09/2026, 17:05
-
Giacomo Griseri (INFN-LNF)24/09/2026, 17:25Invited
ARIA will be the second free-electron laser beamline of the plasma-based accelerator facility EUPRAXIA@SPARC_LAB, hosted at Laboratori Nazionali di Frascati. Designed as a seeded FEL operating in the ultraviolet spectral range, ARIA will complement FERMI, providing radiation in the range 50-180nm.
Leveraging the capability of EUPRAXIA@SPARC_LAB to generate ultrashort electron...
Go to contribution page -
Eduard Prat Costa (PSI - Paul Scherrer Institut)24/09/2026, 17:45Invited
-
24/09/2026, 18:10
-
Tais Gorkhover, Tais Gorkhover (Universität Hamburg)25/09/2026, 08:30
-
Agostino Marinelli (SLAC National Laboratory)25/09/2026, 08:50Invited
-
Philipp Amstutz (DESY)25/09/2026, 09:10Invited
-
25/09/2026, 09:40
-
Mikako Makita (European XFEL GmbH)25/09/2026, 11:25
-
River Robbles (SLAC)25/09/2026, 11:50
-
P. Rebernik25/09/2026, 12:10
-
Giovanni Perosa25/09/2026, 12:30
-
Filippo Sottocorona (DESY)
-
Giovanni Campri (Elettra-Sinctrotrone Trieste S.C.p.A.)
-
Modeling Talbot-based X-ray Transient Grating Spectroscopy for X-ray Free-Electron Lasers
Andrii Goloborodko¹,², Carles Serrat3
¹ Tieto Poland Sp. z o.o., Szczecin, Poland, ² PWGP Labs, Bucha, Ukraine
3 Universitat Politècnica de Catalunya-BarcelonaTech (UPC), Terrassa, Spaincarles.serrat-jurado@upc.edu
Go to contribution page -
Nicolas Delnour (Physics Department, Centre for the Physics of Materials, McGill University)
Word template attached to the submission.
Only the abstract:
Go to contribution page
The emergence of extreme-ultraviolet free-electron-laser (EUV FEL) sources has made possible transient grating (TG) spectroscopy at nanometer length scales, enabling studies of nanoscale thermal transport and bulk and surface coherent phonons with nanoscale wavelengths [1]. Here, we report very recent EUV TG measurements... -
Tim van Driel (SLAC National Accelerator Laboratory)
-
Silja Schmidtchen (European XFEL)
The degradation and Carbon contamination of X-ray optics is a well-known problem in X-ray beamlines with harmful effects on beamline performance. This is particularly problematic, as such optics are usually highly specialized and coated with various materials. Consequences of such contamination include the distortion of the wavefront, reduction in focusing power and resolution, and loss of...
Go to contribution page -
Carles Serrat (Polytechnic University of Catalonia)
Small-angle X-ray scattering (SAXS) measurements of aqueous L-cysteine solutions were performed at the SPB/SFX instrument of the European XFEL using train-resolved acquisition with the AGIPD detector. Detecting weak sample-dependent signals under XFEL conditions is challenging because the measured contrast is often dominated by normalization uncertainties, beam fluctuations, detector effects,...
Go to contribution page -
Markus Scholz (Deutsches Elektronen Synchrotron DESY)Invited
It is a long-standing goal of surface and interface science to simultaneously image atomic positions, molecular orbital wavefunctions, and electronic-state dynamics as bonds and bands rearrange in time. Here, we realize this in a single experimental scheme by combining four modalities of time-resolved photoelectron spectroscopy: trARPES, tr-orbital tomography, trXPS, and trXPD—using ultrashort...
Go to contribution page -
Patrick Rauer (Deutsches Elektronen-Synchrotron DESY)Invited
Choose timezone
Your profile timezone: