Elastic Scattering of Slow Ions in Gases

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Abstract
Differential cross sections for the elastic scattering of slow ions by neutral atoms or molecules have been calculated by numerical integration of the classical equations of motion. The model used for the ion-neutral potential energy function consists of three terms: an r—4 attraction, an r—6 attraction, and an r—12 repulsion. The attractive terms are theoretically sound, but the repulsive term is empirical. Quantum effects have been ignored, but an approximate formula indicates at what point the classical calculations begin to fail in any particular case. The results should be of most use in the very low energy region where experimentation is difficult.

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