ANHARMONICITY EFFECTS IN THE COLLINEAR COLLISION OF 2 DIATOMIC-MOLECULES

The collinear collision of two diatomic molecules is studied. Six different systems - namely N2 + N2, N2 + CO, N2 + OC, N2 + O2, H2 + H2, and H2 + HBr - are selected as samples and compared to each other. In addition, the effect of anharmonicity on the vibrational excitation is investigated. Exact quantum-mechanical transition probabilities are calculated, the Morse and harmornic binding potentials being considered in each case. It is shown that anharmonicity often decreases the TV transition probabilities by a large factor, whereas it has only a small effect on VV transition probabilities. The results are interpreted on the basis of previous ideas on atom-diatom and diatom-diatom collinear collisions. © 1979.