摘要:

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 the10−6-Torr range without oil or water vapor contamination.

ISSN:0022-5355    

DOI:10.1116/1.1317018

出版商:American Vacuum Society    

年代:1972

数据来源: AIP

摘要:

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.

ISSN:0022-5355    

DOI:10.1116/1.1317019

出版商:American Vacuum Society    

年代:1972

数据来源: AIP

摘要:

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.

ISSN:0022-5355    

DOI:10.1116/1.1317020

出版商:American Vacuum Society    

年代:1972

数据来源: AIP

ISSN:0022-5355    

DOI:10.1116/1.1317021

出版商:American Vacuum Society    

年代:1972

数据来源: AIP

ISSN:0022-5355    

DOI:10.1116/1.1317022

出版商:American Vacuum Society    

年代:1972

数据来源: AIP

ISSN:0022-5355    

DOI:10.1116/1.1317023

出版商:American Vacuum Society    

年代:1972

数据来源: AIP

ISSN:0022-5355    

DOI:10.1116/1.1317024

出版商:American Vacuum Society    

年代:1972

数据来源: AIP

ISSN:0022-5355    

DOI:10.1116/1.1317025

出版商:American Vacuum Society    

年代:1972

数据来源: AIP