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BROWSE VOLUMES

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Volume 9

Issue 6 | Nov | pp. 1301-1474

Issue 5 | Sep | pp. 1237-1274

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1971

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Sep 1972

Volume 9, Issue 5, pp. 1237-1274

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Some Tests on Noncooled Zeolites

A. Luches and A. Zecca

J. Vac. Sci. Technol. 9, 1237 (1972); http://dx.doi.org/10.1116/1.1317018 (4 pages)

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Tests were performed to investigate the trapping and pumping properties of two kinds of zeolite as a function of temperature and duration of baking. Residual gas spectra were also recorded. The results showed that a vacuum system made up by a rotary pump and a noncooled zeolite trap can reach pressures down in the 10⁻⁶-Torr range without oil or water vapor contamination.

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68.08.-p	Liquid-solid interfaces
68.43.-h	Chemisorption/physisorption: adsorbates on surfaces
07.30.Bx	Degasification, residual gas

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Gas Adsorption by Refractory Metal Single Crystals

V. S. Ageikin, B. A. Chuikov, Yu. G. Ptushinskii, and N. P. Vas’ko

J. Vac. Sci. Technol. 9, 1241 (1972); http://dx.doi.org/10.1116/1.1317019 (7 pages)

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The results are considered of a mass spectrometric investigation of the low-pressure oxygen interaction with surfaces of tungsten and molybdenum single crystals of different crystallographic orientation. It has been established that oxygen thermodesorption occurs only in the form of unbound oxygen atoms (atomic phase) and a set of metal oxides (oxide phase); and that the oxygen quantities in the atomic and the oxide phases are comparable. A correlation is discussed between quantitative data on the surface concentration, the sticking probability and the adsorption heat of oxygen on tungsten, and the atomic structure of different faces of a single crystal. The problem is considered of a correspondence between the composition of thermodesorption products and that of the adsorbed film. Some data are also considered on the inhibition of the adsorption ability of the surface of the single crystal of tungsten in respect to carbon monoxide or nitrogen when that surface is partially covered with electronegative or electropositive adatoms. The analysis of the results shows that the inhibition effect of the adsorption ability largely depends on the charge state of the adatoms and the electron structure of the adsorbed molecules.

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68.03.Fg	Evaporation and condensation of liquids
68.43.Mn	Adsorption kinetics
73.20.Hb	Impurity and defect levels; energy states of adsorbed species

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Kinetic Theory of a Modified Knudsen’s Absolute Manometer

Yau Wu and Birendra Dutt

J. Vac. Sci. Technol. 9, 1248 (1972); http://dx.doi.org/10.1116/1.1317020 (5 pages) | Cited 2 times

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The revised theory of thermal transpiration by Wu has been applied to the case of a modified Absolute Manometer for any temperature ratios and arbitrary accommodation coefficients on the boundaries of the three plates. According to the Lockenvitz’s approximate theory the pressure on the central vane is independent of its temperature. This paper explicitly shows that the pressure on the central vane is dependent on its temperature. A comparison of both theories has been discussed extensively for arbitrary temperature on the central plate.

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07.30.Dz

Vacuum gauges