Coherence analysis and tensor polarization parameters of (γ,eγ) photoionization processes in atomic coincidence measurements

摘要

Photoionization of atoms can be linked to the original discovery of the photoelectric effect by Hertz (1887) and almost simultaneously by Hallwachs (1888) in the 19th century. Sophisticated investigations on photoionization of free atoms were first primarily related to total and differential cross-section measurements. Photoelectron spectroscopy refers to measurements of energies and intensities often including their angular distributions (Berkowitz, 1979). So-called complete or perfect atomic collision and photoionization experiments were based on analysis of particle-photon-, particle-particle-coincident correlations and electron- and atomic spin and orientation effects. References to recent developments of such investigations can be linked to the monograph by Schmidt (1997) and the conference report by Becker and Crowe (2001).