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 $\Delta$ and $\epsilon$) obey rigorous selection rules which require that they go to $\frac{\pi }{2}$ at 0° and 180° 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.