Free-electron lasers and high-harmonic-generation table-top systems are new sources of
extreme-ultraviolet to hard X-ray photons, providing ultrashort pulses that are intense …

This review is focused on free-electron lasers (FELs) in the hard to soft x-ray regime. The
aim is to provide newcomers to the area with insights into: the basic physics of FELs, the …

X-ray free-electron lasers (XFELs) and table-top sources of x-rays based upon high
harmonic generation (HHG) have revolutionized the field of ultrafast x-ray atomic and …

Fully coherent, soft X-ray attosecond pulses are now available through high-order harmonic
generation (HHG); however, the output energy is insufficient for various applications, such …

Free-electron lasers provide a source of x-ray pulses short enough and intense enough to
drive nonlinearities in molecular systems. Impulsive interactions driven by these x-ray pulses …

Recent developments in extreme ultraviolet (XUV) and x-ray radiation sources have pushed
pulse energies and durations to unprecedented levels that opened up the era of non-linear …

Untargeted toxicological screening is an analytical challenge, given the high number of
molecules and metabolites to be detected and the constant appearance of new …

Calculations of first-order response wave functions in the X-ray regime often diverge within
correlated frameworks such as equation-of-motion coupled-cluster singles and doubles …

X-ray two-photon absorption (TPA) spectrum of metallic copper is measured using a free-
electron laser (XFEL). The spectrum differs from that measured by the conventional one …

To shorten the duration of x-ray pulses, we present a nonlinear optical technique using
atoms with core-hole vacancies (core-hole atoms) generated by inner-shell photoionization …