Photoeffect from theLShell

Abstract

The differential cross section for photoeffect from an atomic shell is shown to be almost independent of principal quantum number, apart from normalization, for energies well above threshold. The high-energy limits of the total cross sections for the three $L$ subshells are calculated exactly with methods previously applied to the $K$ shell, and extrapolations are made to cover the entire high-energy region. A procedure is indicated to account for the effects of electron screening. It is found that the contribution from the $p$ subshells is not negligible in heavy elements. Agreement with experiment is good.