Coster-Kronig, fluorescence, and Auger yields of the Ag-47 L subshells measured through synchrotron photoionization

摘要

The decay of individual L subshell vacancies in,Ag has been investigated through selective photoionization by monochromatized synchrotron radiation. By tuning the radiation energy over the L edges, the ionization of particular subshells can be turned off and on. The corresponding subshell ionization cross sections including the subtle structure caused by electron correlations are known from our previous studies. The x-ray fluorescence emitted in the vacancy decay was recorded by a Si (Li) detector. Advanced fitting techniques were employed to extract the intensities of lines originating from different subshells. The extracted line intensities were plotted versus energy of the primary radiation. The relative jumps of the line intensities occurring at the edges directly correspond to the Coster-Kronig yields, whereas the absolute values of the total subshell fluorescence give the fluorescence yields. The following Coster-Kronig yields were obtained: f(12) = 0.14(3), f(13) = 0.58(5), and f(23) = 0.18(3). Adopting the value omega(3) = 0.056(7) from literature, the following fluorescence yields are obtained: omega(1) = 0.013(2) and omega(2) = 0.067(9). The results agree reasonably with theoretical calculations. In particular, the rather large value of f(13) indicates that the L-1-L3M4,5 Coster-Kronig channel is well allowed. [S1050-2937(99)05005-2]. [References: 29]