During the past decade, the Ratip program has been developed to calculate the electronic
structure and properties of atoms and ions. This code, which is now organized as a suite of …

The two single-pass, externally seeded free-electron lasers (FELs) of the FERMI user facility
are designed around Apple-II-type undulators that can operate at arbitrary polarization in the …

Quantum optics with X-rays has long been a somewhat exotic activity, but it is now rapidly
becoming relevant as precision x-ray optics and novel X-ray light sources, and high-intensity …

Electronic structure computations of atoms and ions have a long tradition in physics with
applications in basic research, spectroscopy, life sciences and technology. Various …

The progress and the chronology in understanding the influence of electron correlations on
the electronic structure of atoms and the dynamics of atomic processes is reviewed focusing …

High-accuracy calculations of atomic properties of the superheavy elements (SHE) up to
element 122 are reviewed. The properties discussed include ionization potentials, electron …

Atomic cascades are ubiquitous in nature and they have been explored within very different
scenarios, from precision measurements to the modeling of astrophysical spectra, and up to …

Ultrafast extreme ultraviolet and X-ray free-electron lasers are set to revolutionize many
domains such as bio-photonics and materials science, in a manner similar to optical lasers …

Inner-shell 2 p 3/2 photoionization of high-Z neutral atoms by linearly polarized light and
subsequent L α 1 (3 d 5/2→ 2 p 3/2), L α 2 (3 d 3/2→ 2 p 3/2), and L ℓ (3 s 1/2→ 2 p 3/2) …

A general expression for the angular correlation function of the two emitted photoelectrons in
sequential two-photon double ionization of atoms is derived and discussed. The expression …