Physisorption of Xenon and Krypton on Glass and on Molybdenum Films

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Abstract
Physisorption of room temperature xenon and krypton at low pressures (10−9−10−4 Torr) on Pyrex® and on molybdenum films at 77 ° and 87 °K has been investigated. The initial sticking probabilities are close to unity, and the adsorbate shows high surface mobility. The steady-state data, which can be shown to differ little from equilibrium data, fit the Polyani potential theory and the Dubinin-Radushkevich isotherm. For the films, the isotherm slopes (which are related to the isosteric heats of adsorption) increase with film age; for old films, they approach the values found for physisorption of xenon and krypton on Pyrex and on zirconium films. Constancy of isotherm slopes for argon on widely different adsorbents has been noted previously. Thus, the physisorption forces in these systems appear to be unrelated to specific properties of the sorbing surfaces, except in the case of highly porous adsorbents.

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