We present an experimental demonstration of a stable, low-loss, large X-ray cavity operating
at 1.2 Å wavelength. The cavity consists of four separate high-reflectivity single crystal …

Resonant oscillators with stable frequencies and large quality factors help us to keep track of
time with high precision. Examples range from quartz crystal oscillators in wristwatches to …

Despite tremendous progress in x-ray free-electron laser (FEL) science over the last decade,
future applications still demand fully coherent, stable x rays that have not been …

A cavity-based X-ray free-electron laser (CBXFEL) is a possible future direction in the
development of fully coherent X-ray sources. CBXFELs consist of a low-emittance electron …

The combination of isochoric heating of solids by free-electron lasers (FELs) and in situ
diagnostics by X-ray Thomson scattering (XRTS) allows for measurements of material …

Resonant inelastic x-ray scattering (RIXS) is a widely used spectroscopic technique,
providing access to the electronic structure and dynamics of atoms, molecules, and solids …

Ultrafast heating of solids with modern x-ray free electron lasers (XFELs) leads to a unique
set of conditions characterized by the simultaneous presence of heated electrons in a cold …

Ångstrom and attosecond are the fundamental spatiotemporal scales for electron dynamics
in various materials. Although attosecond pulses with wavelengths comparable to the atomic …

Single bubble sonoluminescence (SBSL) is the phenomenon of synchronous light emission
due to the violent collapse of a single spherical bubble in a liquid, driven by an ultrasonic …

A reliable characterization of x-ray pulses is critical to optimally exploit advanced photon
sources, such as free-electron lasers. In this paper, we present a method based on machine …