The Scattering of Lithium Ions by a Polycrystalline Nickel Surface

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Abstract
Positive ions scattered by a nickel target were measured both as to energy and quantity in various directions. The ions are scattered in a forwardly directed beam whose width at one-half the maximum intensity is about 45°. The direction of the maximum is independent of the incident energy and nearly so of the angle of incidence. The ratio of the most probable energy of the scattered ions to that of the incident ions is found to decrease as the total angle of scattering increases and to be independent of the energy or the angle of incidence. To a first approximation the energy distribution is found to be the same as that for projectiles of macroscopic size undergoing elastic impacts at a rough surface with a small coefficient of restitution.

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