Date of Award

Spring 1972

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Physics

First Advisor

Bills, Francis A.

Second Advisor

Greene, J. B.

Third Advisor

Tani, Smio

Abstract

Surface diffusion coefficients have been determined by several groups of investigators who have all assumed that the coefficient is independent of concentration. This however, is not a valid assumption in the case of atoms migrating over a surface. In certain cases, an appropriate' change of variables reduces the general diffusion equation to an equation with a single independent variable, and allows one to obtain a solution involving the concentration- dependent diffusion coefficients. The atomic beam method offers a new experimental approach to the study of surface migration. From measurements of the concentration of potassium atoms migrating along a stainless steel surface, concentration-dependent surface diffusion coefficients are determined.

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