Accession Number : AD0615040

Title :   STUDY OF ADSORPTION OF GASES ON SOLIDS IN THE HIGH VACUUM RANGE.

Descriptive Note : Final rept. for 1 Jan 62-31 Dec 64,

Corporate Author : GENERAL TELEPHONE AND ELECTRONICS LABS INC BAYSIDE N Y

Personal Author(s) : Bliven,C. M. ; Florio,J. V. ; Baird,D. H.

Report Date : 28 FEB 1965

Pagination or Media Count : 60

Abstract : Investigation of the interaction of N2 with a hot W filament showed that a chemical pumping effect occurs and that the magnitude of this effect varied with temperature. The sticking probability of N2 on W was measured as a function of surface coverage. The data at lower coverages represents the temperature variation in the sticking probability. The surface concentration of N2 at saturation varied with the equilibrium pressure. In studies of the adsorption of O2 on Mo, the sticking probability and Mo work function changes were calculated as a function of O2 surface coverage. For the adsorption of CO on Mo, the calculated value of initial sticking probability and total number of adsorbed molecules are considerably smaller than expected, due to reversible sorption processes. Following the adsorption of CO on polycrystalline W, the subsequent introduction of O2 results in an increase in work function (from 5.2 eV to 6.4 eV) which indicates that a surface previously saturated with CO will not prevent the subsequent adsorption of O2. The retarding field technique for measuring work functions was applied to a silicon semiconductor surface. (Author)

Descriptors :   (*ADSORPTION, GASES), (*WORK FUNCTIONS, SOLIDS), LOW PRESSURE, SURFACE PROPERTIES, OXYGEN, NITROGEN, CARBON COMPOUNDS, MONOXIDES, TUNGSTEN, MOLYBDENUM, SILICON

Distribution Statement : APPROVED FOR PUBLIC RELEASE