Physics Commons^™

Absolute Cross Sections For The Ionization-Excitation Of Helium By Electron Impact, S. Bellm, J. Lower, E. Weigold, I. Bray, D. V. Fursa, K. Bartschat, Don H. Madison, Allison L. Harris

Physics Faculty Research & Creative Works

In a recent publication we presented detailed experimental and theoretical results for the electron-impact-induced ionization of ground-state helium atoms. The purpose of that work was to refine theoretical approaches and provide further insight into the Coulomb four-body problem. Cross section ratios were presented for transitions leading to excited states, relative to those leading to the ground state, of the helium ion. We now build on that study by presenting individual relative triple-differential ionization cross sections (TDCSs) for an additional body of experimental data measured at lower values of scattered-electron energies. This has been facilitated through the development of new electron-gun …