Stephan Fritzsche

TL;DR: An extension to the RACAH program is presented in which the properties and the algebraic rules of the Wigner D-functions and reduced rotation matrices are implemented and care has been taken to combine the standard knowledge about the rotationMatrices with the previously implemented rules for the Clebsch–Gordan coefficients,Wigner n − j symbols, and the spherical harmonics.

TL;DR: In this paper, the contribution of screening and relativistic effects to the photoelectron angular distribution was evaluated using the independent particle approximation and second-order perturbation theory, and a simple nonrelativistic expression for the angle-differential cross section in dipole approximation for two-photon ionization by elliptically polarized photons, and its limitations are analyzed numerically.

TL;DR: In this article, the Coulomb excitation of highly charged few-electron ions in relativistic collisions with protons and low-$Z$ atoms is studied within the framework of first-order perturbation theory and the multiconfiguration Dirac-Fock method.

TL;DR: In this article, the Auger cascades following the resonant $1s\ensuremath{\rightarrow}np$ ($n=3,4$) excitation of neutral neon are studied theoretically.

TL;DR: In this article, the magnetic dipole line strength between the fine-structure levels of the ground configurations in B-, F-, Al-, and Cl-like ions are calculated for the four elements argon, iron, molybdenum, and tungsten.