C. Vallance et al., QUANTUM-MECHANICAL CALCULATION OF MAXIMUM ELECTRON-IMPACT SINGLE IONIZATION CROSS-SECTIONS FOR THE INERT-GASES AND SMALL MOLECULES, Journal of physical chemistry, 100(37), 1996, pp. 15021-15026
Quantum mechanical calculations based on a simple concept of electron
impact single ionization have been carried out for the inert gases and
several molecules in order to determine maximum electron impact ioniz
ation cross sections. For molecular targets, cross sections are calcul
ated as a function of the electron-molecule approach geometry and then
averaged over all orientations for the total ionization cross section
, These have shown promising agreement with experimentally measured cr
oss sections for randomly oriented molecules and also with existing th
eoretical methods. The effect of a quantum mechanical method and basis
set on the calculated cross section has been found to follow systemat
ic trends.