Determination of L-subshell Coster–Kronig and fluorescence yields of lanthanum and praseodymium by synchrotron radiation photoionization

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 La and Pr L subshells. The energy of the primary radiation was set at approximately 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 foil of Ti was used for normalization purposes and the Ti K fluorescence lines were also recorded with the same solid state detector. Fitting the measured fluorescence intensities vs. primary energy with the photoelectric cross-sections derived the Coster–Kronig coefficients and fluorescence yields. The obtained yields were compared with tabulated data and a good agreement among them was found.