Ionization of Molecular Hydrogen by Low-Energy Electron Impact

Doubly-differential cross sections for the ionization of H$_2$ by low-energy electron impact have been measured at incident energies ranging from 17.6~eV to 40~eV and scattering angles of $20^\circ$ to $120^\circ$. The calibration of the electron analyzer during these measurements employed the recent doubly- differential cross section measurements of helium.\footnote{E.\ Schow, K.\ Hazlett, J.\ G.\ Childers, C.\ Medina, G.\ Vitug, I.\ Bray, D.\ V.\ Fursa, and M.\ A.\ Khakoo, {\em Phys.\ Rev.\ A} {\bf 72}, 062717 (2005).} Comparisons will be made to recent theoretical calculations.