Science@FELS

Session

X-ray coherent imaging

23 Sept 2026, 14:00

Auditorium (WHGA/001) (Paul Scherrer Institut)

Conveners

X-ray coherent imaging

• Christoph Bostedt (PSI - Paul Scherrer Institut)

94. From X-ray damage reversal to single-exposure 3D nanoscale imaging via intense sub-femtosecond pulses

Tais Gorkhover

23/09/2026, 14:00

Nonlinear X-ray science

Invited

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...

9. Ultrafast Resonant Single-Particle Imaging with Attosecond XFEL Pulses

Hankai Zhang (EPFL)

23/09/2026, 14:25

AMO Physics

Oral

Abstract
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)...

21. High-Throughput Single-Particle Imaging of Nonequilibrium Nanoparticle Ensembles Using Geometry-Constrained Reconstruction

Zhou Shen (Max-Planck-Institut für Struktur und Dynamik der Materie)

23/09/2026, 14:40

AMO Physics

Oral

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...

23. Fast Simulation of Wide-Angle Coherent Diffractive Imaging

Paul Tuemmler (University of Rostock)

23/09/2026, 14:55

AMO Physics

Oral

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...

62. Coherent Correlation Imaging at XFELs: Enabling X-ray Imaging of Ultrafast Stochastic Processes

Boris Sorokin (University of Augsburg, Helmholtz-Zentrum Berlin, PSI - Paul Scherrer Institut)

23/09/2026, 15:10

Oral

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...

79. Two-color X-ray Coherent Diffraction Movies

Alessandro Colombo (ETH Zurich)

23/09/2026, 15:25

AMO Physics

Invited

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...