Potential-Barrier Effects in Photoabsorption. I. General Theory

Authors

Anthony F. Starace, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

March 1972

Comments

Published by American Physical Society. Phys. Rev. B 5, 1773 (1972). http://prb.aps.org. Copyright © 1972 American Physical Society. Permission to use.

Abstract

This paper combines parts of the theories of spectroscopy, collisions, and autoionization to provide a unified framework for a quantitative theory of experimental data on 4d-shell photoabsorption in rare earths. The calculations by atomic theory are intended for tentative application to solids. The theory should also apply to 3p-shell photoabsorption in the transition metals and to other cases where the effect of a potential barrier is crucial. A prescription is given for the ab initio numerical calculation of total and partial photoabsorption cross sections, as well as of the profiles, energies, and widths of resonances. A sum rule is derived for transitions of the type l_i^4l _i⁺²l_f^N →l_i^4l _i⁺¹l_f^N+1, which yields the integrated strength of observed absorption spectra.