Adsorption Of Nitrogen, Hydrogen, Oxygen, and Carbon Monoxide on a Beryllium Film

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Abstract
Results of measurements of sticking coefficients of nitrogen, hydrogen, oxygen, and carbon monoxide on beryllium thick films at room temperature are described. Beryllium was vapor deposited onto glass substrates and the sticking coefficient of the impinging gas molecules was measured as a function of quantity adsorbed. No adsorption was observed with either nitrogen or hydrogen. A sticking coefficient of 0.4 for oxygen was measured with a total coverage of 8.4×1014 molecules/cm2. Carbon monoxide displayed some pressure dependence and the initial sticking coefficient was found to be roughly proportional to the square root of the pressure. In the 10−8 Torr range a sticking coefficient of 0.1 was measured with a total coverage of 4.0×1013 molecules/cm2; in the 10−7 Torr range a sticking coefficient of 0.5 was measured with a total coverage of 2.4×1014 molecules/cm2.

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