Le rendement de fluorescence

Abstract
It is shown that when allowance is made for screening and relativistic eflects the variation with Z of the fluorescence yield ω, is expected to be of the form [FORMULE] where the constant A includes the effect of screening and C that of relativity. Values of A, B and C are determined from a least squares fit of the K series fluorescence yield experimental data and values in good agreement with theoretical expectations are obtained. Values of A and B (assuming C = o) are also obtained from a least square fit of the rather meagre L series data. The best values for L and M series yield are also discussed.