Conveners
AMO Physics
- Kirsten Andrea Schnorr (PSI - Paul Scherrer Institut)
AMO Physics
- Andre Al Haddad (PSI - Paul Scherrer Institut)
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Hans Jakob Wörner (ETH Zürich)21/09/2026, 11:00AMO PhysicsInvited
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...
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Benoît Richard (Hamburg Center for Ultrafast Imaging / EuXFEL)21/09/2026, 11:25AMO PhysicsInvited
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...
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Robert Radloff (Institut für Experimentalphysik, Universität Hamburg)21/09/2026, 11:50AMO PhysicsOral
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...
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Ulf Saalmann (Max Planck Institute for the Physics of Complex Systems)21/09/2026, 12:05Quantum ScienceOral
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....
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Suddhasattwa Mandal (Paul Scherrer Institut PSI)21/09/2026, 12:20AMO PhysicsOral
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,...
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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...
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Prof. Fernando Martin (IMDEA)22/09/2026, 08:30Tutorial
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Arikta Saha (Elettra Sincrotrone Trieste)22/09/2026, 09:10AMO PhysicsOral
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...
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Loïc Lucien Cédric Bassement (PSI - Paul Scherrer Institut)22/09/2026, 09:25AMO PhysicsOral
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...
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Gergana D. Borisova (Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany; Department of Physics, Lund University, 221 00 Lund, Sweden;)22/09/2026, 09:40AMO PhysicsOral
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...
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Felix Ritzkowsky (DESY)22/09/2026, 10:05AMO PhysicsInvited
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...
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