Average L shell fluorescence yields

Abstract

The average L shell fluorescence yield ω L can be calculated from the three L subshell effective fluorescence yields v i ( i = 1, 2, 3) and a knowledge of the subshell ionisation cross sections σ i 1. Experimental effective fluorescence yields v i have been tabulated by Krause (1979) for elements with 12 ⩽ Z ⩽ 110. Recently, Cohen and Harrigan (1985) calculated L subshell ionisation cross sections for protons and helium ion energies between 100 keV and 10 MeV and selected targets between 18 ⩽ Z ⩽ 96. Here we present results which combine these two tabulations to produce average L shell fluorescence yields ω L for all elements from Ni to Cm. These results are also fitted to standard polynomials in Z and compared to earlier results of Bambynek et al. and Mitchell and Barfoot.