Accession Number : AD0479988

Title :   THEORETICAL STUDIES OF HEAVY ION EXCHANGE IN AIR.

Descriptive Note : Technical rept.,

Corporate Author : GEOPHYSICS CORP OF AMERICA BEDFORD MA

Personal Author(s) : Dalgarno, Alexander ; Florance, Edwin T. ; Macomber, H. Kent ; Webb, T. Gordon

Report Date : MAR 1966

Pagination or Media Count : 92

Abstract : The previous Brinkman-Kramer results for the charge exchange between aluminum and argon have been transformed to the impact parameter representation. The discrepancy between theoretical and experimental cross sections has been reduced by truncating the capture probability in those cases where it becomes unphysical. The above reaction has also been treated by a multistate approximation involving an expansion in atomic eigenfunctions. This report presents the formulation of the multistate equations and a description of the computer code under test. To facilitate calculation of rearrangement matrix elements in the multistate quantal approach, a semi-empirical extrapolation procedure has been developed to incorporate the effects of momentum transfer. Application of extrapolated matrix elements to resonance charge exchange cross sections has been shown to give satisfactory agreement with other treatments. The Thomas classical impulse approximation is compared with experimental data, and the improvement due to Bates and Mapleton is shown to predict capture cross sections quite well for intermediate velocities. (Author)

Descriptors :   *AIR), (*ION EXCHANGE, ELECTRON CAPTURE, ALUMINUM, ARGON, FUNCTIONS(MATHEMATICS), SCATTERING, INTEGRALS, EQUATIONS OF MOTION, ATMOSPHERES, DIFFERENTIAL CROSS SECTIONS, ELECTRONS, INTEGRAL EQUATIONS.

Subject Categories : Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE