Barium L subshells Coster–Kronig and fluorescence yields by the subshell selective photoionization method

Abstract

The method of selective photoionization of individual subshells by monochromatized synchrotron radiation has been employed to measure independently all Coster–Kronig and fluorescence yields of the Ba L subshells. The energy of the primary radiation was set at about 50 energy points in the range of the L edges. At each setting, the induced L fluorescence radiation was recorded by a Si(Li) detector. A pure Ti foil was used for normalization purposes and the Ti K fluorescence lines were also recorded under the same geometrical conditions as the Ba sample. Fitting the measured fluorescence intensities versus primary energy with the photoelectric cross-sections derived the Coster–Kronig coefficients and fluorescence yields. The obtained yields were compared with tabulated data.