Over the last 20 years, XUV and X-ray free-electron lasers have enabled a wide variety of
time-resolved experiments that have dramatically advanced our understanding of ultrafast …

Pump–probe experiments with subfemtosecond resolution are the key to understanding
electronic dynamics in quantum systems. Here we demonstrate the generation and control …

The study of onset and decay, as well as control of ultrafast quantum coherence in many-
electron systems is in the focus of interest of attosecond physics. Interpretation of attosecond …

Attochemistry aims to exploit the properties of coherent electronic wavepackets excited via
attosecond pulses to control the formation of photoproducts. Such molecular processes can …

Ultrafast laser sources in the far ultraviolet (100–300 nm) have been the subject of intense
experimental efforts for several decades, driven primarily by the requirements of advanced …

The concomitant motion of electrons and nuclei on the femtosecond time scale marks the
fate of chemical and biological processes. Here we demonstrate the ability to initiate and …

Ultrafast H2+ and H3+ formation from ethanol is studied using pump-probe spectroscopy
with an extreme ultraviolet (XUV) free-electron laser. The first pulse creates a dication …

We report the measurement of impulsive stimulated x-ray Raman scattering in neutral liquid
water. An attosecond pulse drives the excitations of an electronic wavepacket in water …

The exposure of molecules to attosecond extreme-ultraviolet (XUV) pulses offers a unique
opportunity to study the early stages of coupled electron–nuclear dynamics in which the role …

We study the ultrafast dynamics initiated by a coherent superposition of core-excited states
of nitrous oxide molecule. Using high-level ab initio methods, we show that the decoherence …