Abstract
Physisorption isotherms have been measured for nitrogen on 304 stainless steel in the temperature range 77–90 K and in the pressure range 10−9−10−4 Torr. A static technique was used to obtain the isotherms whereby the pressure change of nitrogen in a constant volume system was measured on immersion of the test surface in different cryogenic baths. The Dubinin-Radushkevich equation provided a good correlation of the data and the extrapolated value for monolayer coverage of 6.6×1014molecules/cm2 indicated a roughness factor near unity for stainless steel. The isosteric heat of adsorption of nitrogen on stainless steel remained constant at about 4.4 kcal/mole in the range of surface coverages from 0.02–0.08.
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