Spin-Orbit Coupling Effects in Parameters that Describe Electron-Photon Coincidence Experiments

Abstract

Parameters are introduced to characterize the electron-photon coincidence rate for atoms where spin-orbit interaction is present in the radiating target state. It is shown that two of these parameters (called $\ensuremath{\Delta}$ and $\ensuremath{\epsilon}$) obey rigorous selection rules which require that they go to $\frac{\ensuremath{\pi}}{2}$ at 0\ifmmode^\circ\else\textdegree\fi{} and 180\ifmmode^\circ\else\textdegree\fi{} electron scattering angles in the presence of spin-orbit coupling while their limit in the $\mathrm{LS}$-coupled case is 0. Numerical results are presented.