This article summarizes technical advances contained in the fifth major release of the Q-
Chem quantum chemistry program package, covering developments since 2015. A …

In quantum materials, emergent functional properties resulting from strong correlations or
electronic topology offer opportunities for new applications. Over the past decade, ultrafast …

Recent progress in high power ultrafast short-wave and mid-wave infrared lasers has
enabled gas-phase high harmonic generation (HHG) in the water window and beyond, as …

Since the first demonstration of the generation of attosecond pulses (1 as= 10− 18 s) in the
extreme-ultraviolet spectral region, several measurement techniques have been introduced …

Femtosecond mode-locked lasers producing visible/infrared frequency combs have steadily
advanced our understanding of fundamental processes in nature. For example, optical …

The possibility to excite and control charges in matter on ultrafast timescales is a key
requisite to overcome the current limits of information transfer and data processing. The …

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 …

High harmonic generation (HHG) enables coherent extreme-ultraviolet (XUV) radiation with
ultra-short pulse duration in a table-top setup. This has already enabled a plethora of …

The electronic character of photoexcited molecules can abruptly change at avoided
crossings and conical intersections. Here, we report direct mapping of the coupled interplay …

The ability to perform attosecond-pump attosecond-probe spectroscopy (APAPS) is a
longstanding goal in ultrafast science. While first pioneering experiments demonstrated the …