A recent rejuvenation of experimental and theoretical interest in the physics of few-body
systems has provided deep, fundamental insights into a broad range of problems. Few-body …

Owing to their unique physical and chemical properties, transition metal compounds,
especially transition metal oxides, nitrides, carbides and sulfides, have been the subject of …

This review presents an overview of the X-ray absorption spectra of 3d transition metals and
their compounds. The emphasis is on the description of the X-ray absorption process and …

Multichannel atomic spectra frequently exhibit such extraordinary visual complexity that they
appear at first glance to be uninterpretable. The present review discusses how to unravel …

A comprehensive review is given on photoionization of rare gas atoms using
monochromatized synchrotron radiation. Emphasis is put upon the general experimental …

Developments in the application of hyperspherical coordinates in a unified treatment of
bound states and resonances of two-electron atomic systems and other general Coulomb …

Since the first attempts to calculate the helium ground state in the early days of Bohr-
Sommerfeld quantization, two-electron atoms have posed a series of unexpected …

We describe extensive results on the 1 P o double-excitation resonances of He below the
N= 2–9 ionization thresholds obtained recently by high-resolution photoionization …

We calculate and analyse S-wave resonances of helium up to an energy of-0.02 au applying
the complex rotation technique. Rydberg series converging to the hydrogenic thresholds of …

Using theoretical results from complex rotation calculations and data from experimental
photoionization cross sections, the quantum defects, the widths, the oscillator strengths and …