Fluorescence Yields and X-Ray Production from Atomic Inner Shells

摘要

In this paper we briefly review the theory of photon emission in energetic atomic transition, with special emphasis on relativistic effects and gauge dependence. We review present-day ab initio calculations of the total widths of atomic hole states and point out some frustrating difficulties that remain unresolved. The consequent limitation on theoretical fluorescence yields of single-vacancy states are outlined, and some general principles regarding ther fluorescence yields of multiply ionized systems are noted. (Author)