Free-electron lasers produce extremely brief, coherent, and bright laser-like photon pulses
that allow to image matter at atomic resolution and at timescales faster than the …

The advent of free electron laser (FEL) facilities capable of delivering high intensity pulses in
the extreme-UV to X-ray spectral range has opened up a wide vista of opportunities to study …

Attosecond chronoscopy is central to the understanding of ultrafast electron dynamics in
matter from gas to the condensed phase with attosecond temporal resolution. It has …

Photons have fixed spin and unbounded orbital angular momentum (OAM). While the former
is manifested in the polarization of light, the latter corresponds to the spatial phase …

Two-color, single-shot time-of-flight electron spectroscopy of atomic neon was employed at
the Linac Coherent Light Source (LCLS) to measure laser-assisted Auger decay in the x-ray …

We describe the optical pump–probe laser system at the XUV free-electron laser FLASH at
DESY. A growing interest in optical laser pulses combined with the free-electron laser (FEL) …

In pump-probe experiments employing a free-electron laser (FEL) in combination with a
synchronized optical femtosecond laser, the arrival-time jitter between the FEL pulse and the …

First experiments on atomic photoionization and molecular dissociation have been
performed by taking advantage of the unprecedented characteristics of the free electron …

FLASH, the free electron laser at DESY in Hamburg, is the first facility of its kind providing
intense, femtosecond radiation pulses in the vacuum ultraviolet and soft X-ray range for user …

For the investigation of processes happening on the time scale of the motion of bound
electrons, well-controlled X-ray pulses with durations in the few-femtosecond and even sub …