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Title: Rotational coupling in ion-atom collisions

The effects of rotational coupling are examined in two low energy charge exchange collisions. A justification for a semi-classical treatment of the collisions is presented and it is then shown that for low incident velocity the impact parameter treatment reduces to the Perturbed Stationary State method. Thus the ion-atom system is treated as a quasi-molecule. During the collision the internuclear axis rotates and this rotation is treated as a perturbation which couples certain states in the quasi-molecule. This approach is used to derive expressions for the scattering amplitudes of the ..sigma.., PI, and ..delta.. states of the He + -He system. This derivation suggests that the phase difference between the ..sigma.. and PI states exhibits small amplitude oscillations about ninety degrees. The molecular states for the H/sup +/ + Xe system are determined and the scattering amplitudes for low energy proton-Xenon collisions are calculated. It is shown that a molecular model leads to the prediction of spin polarized hydrogen in accordance with the earlier work of Shakeshaft and Macek.
Authors:
Publication Date:
OSTI Identifier:
6375079
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Publisher:
Univ. of Nebraska,Lincoln, NE
Research Org:
Nebraska Univ., Lincoln (USA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; HELIUM; ION-ATOM COLLISIONS; HELIUM IONS; HYDROGEN IONS; XENON; CHARGE EXCHANGE; COUPLING; ENERGY LEVELS; MOLECULES; PSS METHOD; ROTATION; SCATTERING AMPLITUDES; AMPLITUDES; ATOM COLLISIONS; CHARGED PARTICLES; COLLISIONS; ELEMENTS; FLUIDS; GASES; ION COLLISIONS; IONS; MOTION; NONMETALS; RARE GASES 640304* -- Atomic, Molecular & Chemical Physics-- Collision Phenomena