FIRST ADSORBED LAYER OF NITROGEN ON PYREX AT 77.4° K

Abstract

A measure of the nitrogen adsorption isotherm on pyrex (Corning 7740) at 77.4° K has been made for pressures above the adsorbed layer ranging from 10−3 to 10−9 mm Hg. Ultrahigh-vacuum techniques were used. Geometric adsorbing areas were 60 and 32 cm2. Coverages ranged approximately from 0.001 to 0.3 monolayer. Full equilibrium was probably not achieved but the data could be represented by the Dubinin–Radushkevich equation,[Formula: see text]for P/P0 from 10−6 to 10−11, where σ is the amount adsorbed.