Accession Number : AD0451983

Title :   INELASTIC ATOMIC COLLISIONS INVOLVING THE PSEUDO-CROSSING OF POTENTIAL ENERGY SURFACES,

Corporate Author : QUEEN'S UNIV BELFAST (NORTHERN IRELAND)

Personal Author(s) : Bates,D. R. ; Johnston,H. C. ; Stewart,I.

Report Date : 09 JUN 1964

Pagination or Media Count : 9

Abstract : The coupled equations of the semi-classical twostate approximation (with velocity of relative motion treated as constant) are considered. It is shown that the probability of a transition occurring for given impact parameter may be ex pressed in terms of the solutions to these equations at the point where the colliding atoms are closest. The formula obtained is rather similar to, but has revealing differences from, the corresponding formula of the Landau-Zener approximation. The significance of the differences is discussed. Detailed calculations are carried out on H + Be2(+) yields H(+) + Be(+) and on H + Mg2(+) yields H(+) + Mg(+). The crosssection-energy curve for the first has a single peak, the magnitude of which is almost twice that given by the Landau-Zener approximation; that for the second has two widely separated peaks. (Author)

Descriptors :   (*NUCLEAR REACTIONS, ELECTRON TRANSITIONS), (*PROTON BOMBARDMENT, ELECTRON TRANSITIONS), HYDROGEN, BERYLLIUM, MATHEMATICAL PREDICTION, EQUATIONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE