High-resolution Laboratory Measurements of K-shell X-Ray Line Polarization and Excitation Cross Sections in Helium-like S XV Ions

Calculation of the photoionization with de-excitation cross sections of He and helium-like ions

We discuss the results of the calculation of the photoionization with de-excitation of excited He and helium-like ions Li+ and B3+ at high but non-relativistic photon energies ω. Several lower 1S and 3S states are considered. We present and analyze the ratios R d of the cross sections of photoionization with de-excitation, σ (d)(ω), and of the photo-ionization with excitation, σ +∗(ω). The depe...

Measurements of absolute K-shell ionization cross sections and L-shell x-ray production cross sections of Ge by electron impact

Results from measurements of absolute K-shell ionization cross sections and La x-ray production cross sections of Ge by impact of electrons with kinetic energies ranging from the ionization threshold up to 40 keV are presented. The cross sections were obtained by measuring Ka and La x-ray intensities emitted from ultrathin Ge films deposited onto self-supporting carbon backing films. Recorded x...

X-ray radiation from ions with K-shell vacancies

New types of space resolved X-ray spectra produced in light matter experiments with high intensity lasers have been investigated experimentally and theoretically. This type of spectra is characterised by the disappearance of distinct resonance line emission and the appearance of very broad emission structures due to the dielectronic satellite transitions associated to the resonance lines. Atomi...

Measurements of stopping cross sections of liquid water for fast protons and helium ions

S-states of helium-like ions

Two-electron atoms or ions present an excellent testing ground for checking new calculational methods and for studying photoelectron and other atomic processes. A large variety of techniques have been developed to obtain the non-relativistic bound energies and wave functions for the mentioned systems. An excellent review on this topic can be found in [1, 2]. The double basis set method in Hylle...