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 …

Electron transfer from valence to conduction band states in semiconductors is the basis of
modern electronics. Here, attosecond extreme ultraviolet (XUV) spectroscopy is used to …

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 …

Quantum coherent evolution, interference between multiple distinct paths,,, and phase-
controlled sequential interactions are the basis for powerful multi-dimensional optical and …

Present performance and future development of the free-electron lasers (FELs) in Hamburg—
FLASH for the extreme ultraviolet and the European XFEL for the soft and hard x-ray …

Nanostructures exposed to ultrashort waveform-controlled laser pulses enable the
generation of enhanced and highly localized near fields with adjustable local electric field …

High-harmonic generation spectroscopy is a powerful tool for ultrafast spectroscopy with
intrinsic attosecond time resolution. Its major limitation—the fact that a strong infrared driving …

A split-and-delay unit for the extreme ultraviolet and soft X-ray spectral regions has been
built which enables time-resolved experiments at beamlines FL23 and FL24 at the Free …

The angular distribution of photoelectrons ejected during the ionization of Ne atoms by
extreme ultraviolet (XUV) free-electron laser radiation in the presence of an intense near …

We use the soft-photon approximation, formulated for finite pulses, to investigate the effects
of the dressing pulse duration and intensity on simulated attosecond pump–probe …