1s-2p Excitation of Atomic Hydrogen by Electron Impact Studied Using the Angular Correlation Technique

Abstract

Excitation of the $2p$ state of atomic hydrogen by electron impact was studied using the electron-photon angular correlation technique with the aim of resolving a long-standing and serious discrepancy between theories and previous experiments at large scattering angles. At a scattering angle of 100\ifmmode^\circ\else\textdegree\fi{}, where the discrepancy was greatest, the present result shows excellent agreement with the theoretically predicted correlations.