M(alpha) and M(beta) X-Ray Emission Spectra of Au Atoms upon Photoionization of L Subshells

摘要

The structure and relative intensity of the M(alpha) and M(beta) X-ray fluorescence spectra of Au atoms are studied experimentally at the energies of absorbed photons both below and above the ionization thresholds of L subshells (K(alpha)_(1,2) radiation of Cr, Cu, and Mo). The M_(5)N and M_(4)N high-energy satellites are separated from the total spectral profiles and their relative intensities are determined. A model of the M emission is proposed that allows one to take into account the main channels of vacancy transfer from L to M subshells, which are responsible for the generation of double vacancy (M_(4,5)N and M_(4,5)O) and triple vacancy (M_(4,5)N~(2), M_(4,5)NO, and M_(4,5)O~(2)) states. Comparison of the experimental relative intensities of separated M_(5)N and M_(4)N satellites excited by the Mo K(alpha)_(1,2) radiation with the calculated results indicates the correctness of the model used. The partial and total M emission cross sections of Au in the absorbed photon energy range of 5-30 keV are calculated. It is found that, in the photon energy region above the ionization threshold of the L_(3) subshell, our results noticeably differ from the data calculated by other authors. Possible reasons for these discrepancies are discussed.