Photoemission Cross Sections

Abstract

Photoabsorption cross sections have been studied extensively for many years, both experimentally and theoretically. Detailed tabulations1-4 are available over large energy regions. In the vacuum ultraviolet and soft X-ray spectral regions, however, much less attention has been paid to the energy dependence of photoionization cross sections of the atomic subshells. From a spectroscopic point of view, this is a very important spectral region,5 and knowledge of the energy dependence of subshell photoionization cross sections is of great value and necessity for a large number of spectroscopic experiments on atomic and molecular gases, physi- and chemisorbed atoms and molecules, solids, and liquids.