A critical analysis of the experimental L-shellCoster–Kronig and fluorescence yields data

摘要

A critical analysis of the methods used to determine the L-shell Coster–Kronig and fluorescence yield data are given. The collected data sets have a large scatter, indicating methodological issues. The Ka-L coincidence technique and the synchrotron ionization methods are analyzed in detail, and it is demonstrated that both methods have unrecognized systematic errors. It is emphasized that the synchrotron measurements clearly show deviations from the exclusively used exponential form of the energy dependence of the photoionization cross-section. Thus, the far-range extrapolation introduces an error, which magnitude is difficult to assess. Comment on the use of polarization-sensitive devices to detect polarized X-ray is offered. New strategies are recommended for the measurement of these parameters.