L-subshell fluorescence yields for elements with 73≤Z≤83

An analysis of the L x-ray spectra, induced by ∼50 keV electron impact and recorded with a curved crystal spectrometer, has been performed based on a calculation model that takes into account all physical events taking place during the initial ionization and inner-vacancy processes. The L-subshell fluorescence yields ${\mathrm{\omega }}_1$, ${\mathrm{\omega }}_2$, and ${\mathrm{\omega }}_3$ for ten elements with atomic number Z=73–83 were obtained. They are all in good agreement with recent measurements but display an appreciable disagreement with the semiempirically compiled data for the elements around Z=80. These experimental values of ${\mathrm{\omega }}_1$ are approximately 20% larger than the compiled data and 55% larger than the latest theoretical calculation for the elements with Z≊80.