Excitation plus ionization in electron-atom collisions to $He^+$ (n=2): (e, 2e), (e, $egamma$ ) and (e,2e$gamma$) studies

Abstract

Simultaneous excitation-ionization of helium atoms by electron impact is observed by the coincidence detection of the outgoing particles. The relationship between (e,2e), (e,$egamma$ ) and (e,2$egamma$ ) experiments is discussed.