The development of femtosecond lasers brought entirely new possibilities into the practice of
timeresolved spectroscopy, for both UV-vis and IR-Raman spectroscopies. In addition, it has …

In this contribution, we highlight the state of the art in the determination of structures with
ultrafast electrons and X‐rays. We provide our perspectives and reflections on the principles …

Excitation localization involving dynamic nanoscale distortions is a central aspect of
photocatalysis, quantum materials and molecular optoelectronics. Experimental …

We present the advances in x-ray femtosecond pulse generation and the most recent
discoveries in the field of ultrashort (femtosecond) x-ray science. Nowadays x-rays show …

This review discusses picosecond ultrasonics experiments using ultrashort hard x-ray probe
pulses to extract the transient strain response of laser-excited nanoscopic structures from …

X-ray diffraction with femtosecond time-resolution represents a direct probe of ultrafast
structural changes in condensed matter. The generation of ultrashort X-ray pulses in laser …

Photoexcited molecules are quintessential reactants in photochemistry. Structures of these
photoexcited molecules in disordered media in which a majority of photochemical reactions …

Transmission electron diffraction is naturally sensitive to the detection of shear-type
deformations in single-crystalline structures due to the effective tilting of the lattice planes …

The dynamics of lattice vibrations govern many material processes, such as acoustic wave
propagation, displacive phase transitions, and ballistic thermal transport. The maximum …

Non-equilibrium phonons have been discussed for almost six decades. Here, the nature of
the longitudinal optical mode, particularly in polar materials, is discussed along with its …