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 …

Over more than a century, X-rays have transformed our understanding of the fundamental
structure of matter and have been an indispensable tool for chemistry, physics, biology …

We report on the first demonstration of femtosecond x-ray absorption spectroscopy, made
uniquely possible by the use of broadly tunable bending-magnet radiation from “laser …

Accelerator-based light sources such as storage rings and free-electron lasers use
relativistic electron beams to produce intense radiation over a wide spectral range for …

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 …

Femtosecond electron diffraction (FED) has the potential to directly observe transition state
processes. The relevant motions for this barrier-crossing event occur on the hundred …

We report on the temporal and spatial stability of the first tunable femtosecond undulator
hard–x-ray source for ultrafast diffraction and absorption experiments. The 2.5–1 Å output …

At the 1.7-GeV electron storage ring BESSY II, a first source of synchrotron radiation with
100 fs pulse duration, variable (linear and circular) polarization, tunable photon energy (300 …

In this study, we perform steady-state and time-resolved X-ray absorption spectroscopy
(XAS) on the iron K-edge of [Fe (tren (py) 3)](PF6) 2 dissolved in acetonitrile solution. Static …

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 …