ELECTRONIC-TRANSITIONS IN THE ION-MOLECULE REACTION (AR++H2]--]AR+H2+)-]ARH++H

A collinear reactive study of the ion-molecule system (Ar + H2+, Ar+ + H2, ArH+ + H) is presented. The main emphasis was directed towards the two reactions Ar++H2(=0)ArH++H and Ar+H2+(=2)ArH++H, which exhibit avoided-crossing features. It is shown that reactive transition probabilities obtained from an exact collinear treatment which incorporated a large number of vibrational states to ensure convergence are reproduced by simple reactive curve-crossing models. © 1979 The American Physical Society.