Angular and energy dependence of cross sections for ejection of electrons from water vapor. II. 15-150-keV proton impact.

Abstract

Absolute values of cross sections for electron ejection by protons of 15--150 keV energy have been measured as a function of the angle and energy of the electrons. The range of angles was 10\ifmmode^\circ\else\textdegree\fi{} to 160\ifmmode^\circ\else\textdegree\fi{} and the electron energy range was 1--300 eV. The doubly differential cross sections were also integrated over energy or angle to obtain singly differential and total cross sections and also average ejected electron energies. Good agreement is obtained with Senger's DDCS-MT (doubly differential cross section--mixed treatment) theoretical treatment using the Salin factor.