B. Obst

Valence satellite and 3p photoelectron spectra of atomic Fe and Cu

The 3p photoelectron spectra of atomic Fe and Cu, and the Fe outer-shell satellites have been investigated. The complex multiline structure of the Fe spectra has been resolved using high-resolution electron spectroscopy. The thresholds of the direct 3p photoionization have been determined and are compared with experimental results from photoabsorption measurements and Auger spectra, and with the multiplet structures calculated taking into account intershell and configuration interaction. The stepwise decay of highly excited Fe states into has been verified by the detection of satellite lines with binding energies above the lowest ionization threshold.

The decay of the 2p resonances of atomic scandium studied by photoelectron spectroscopy

Using the atomic beam technique and photon excitation with monochromatized synchrotron radiation, the photoelectron spectra from the decays of the 2p → nd resonances of atomic Sc in the region between 397 and 410 eV were investigated. The analysis of the photoelectron spectra was performed with Hartree–Fock calculations for the excitation and the decay of the 2p resonances. Good agreement between experimental and theoretical spectra enabled us to assign the main structures of the spectra to definite transitions, with the participation of electrons from the inner 3s and 3p subshells, as well as from the 3d and 4s valence subshells.

INFLUENCE OF THE IONIC STATE ON O(2P) PHOTOELECTRON ANGULAR DISTRIBUTIONS

The angular distribution parameter was measured for all final ionic states (4S, 2D and 2P) of the 2p-ionization of atomic oxygen in the photon energy range from 24 to 70 eV. Deviations from the LS-independent model were observed. This effect may be caused by final-state electron-ion interaction and many-electron correlation. It was predicted by calculations.

Determination of Ca 2p ionization thresholds by high-resolution photoelectron spectroscopy

The energies of the closely spaced Ca 2p thresholds have been determined by crossing an atomic beam of calcium with the monochromatized synchrotron radiation from the high-resolution undulator beamline SX 700 - BW3 at HASYLAB and analysing the kinetic energy of the outgoing photoelectrons with a high-resolution SCIENTA SES 200 electron analyser. The experimental results are compared to the predictions of different theoretical approaches and the strong influence of electron correlation in the core ionized state is demonstrated.

High resolution spectroscopy of 2p6→2p53d resonantly excited atomic Ca

Abstract Free calcium atoms were excited in the energy region about 10 eV below the 2p thresholds. For the excitation, synchrotron radiation from the high resolution undulator beamline BW3 (HASYLAB, Hamburg) equipped with a SX-700 monochromator was used. The excited atoms were studied by means of ion as well as electron spectroscopy. Two lines could be resolved within one of the two dominating features of the 2 p →3 d resonance. Resonance enhanced 3 p −1 photoelectron spectra resolving the 2 P 1 2 and 2 P 3 2 lines are presented.