L2,3 and M2,3 level widths and fluorescence yields of copper

Subshell-resolved M and L level widths and fluorescence yields are derived from high-resolution Kα1,2 and Kβ1,3 x-ray emission spectra of copper. As the contribution of spectator hole satellites was removed from the spectra by computer fits based on an ab initio calculated transition array, the widths and yields obtained pertain to pure one-hole states and single-electron diagram transitions. A considerable improvement in the agreement with theoretical widths and yields is observed for all levels studied. A significant contribution of Coster-Kronig transitions to the L2 level width is confirmed. Individual M2 and M3 widths and yields are derived from x-ray spectra. They are in good agreement with recent theoretical Dirac-Hartree-Slater calculations, but the widths are consistently larger than those measured for the same subshells by photoelectron spectroscopy. 3d spectator holes are found to broaden the widths of the corresponding x-ray emission lines by up to a few tenths of an eV.