Effect of Surface Coverage and Temperature on the Sticking Coefficient

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Abstract
A theoretical equation is derived that quantitatively describes the peculiar shape of the curves relating the sticking coefficients for the adsorption of nitrogen and carbon monoxide on tungsten as a function of the amount adsorbed and the temperature. The model used to describe chemisorption into a β state with a high binding energy involves a precursor state of low binding energy as assumed by others. However, emphasis is placed on the importance of nonsteady state of the precursor for low coverage and very high coverage. It is found that if the precursor state is actually the α states (for N2 and CO) discovered by Ehrlich, the experimental curves can be predicted within experimental error.

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