摘要:

The Hansen–Morse model of the linearized Wang Chang–Uhlenbeck equation is used to study the thermal transpiration and mechanocaloric effects for rarefied polyatomic gases in a cylindrical annulus, where boundary conditions are characterized by diffuse reflection. Phenomenological coefficients at all degrees of rarefaction are reported for physical parameters that represent helium, hydrogen, carbon dioxide, and air. Comparisons with isothermal flow data are given.

ISSN:0734-2101    

DOI:10.1116/1.572182

出版商:American Vacuum Society    

年代:1983

数据来源: AIP

摘要:

The problem of calculating the total molecular flow conductance of ductwork made up of series connections of elements of known conductance is discussed from the transmission probability point of view. Cases in which there is a discontinuity in cross section between adjacent elements are included. Two criteria for evaluating methods for this calculation are discussed and applied to two such methods. One method, which includes a short procedure for treating discontinuities in duct cross section, is shown to satisfy both evaluation criteria.

ISSN:0734-2101    

DOI:10.1116/1.572183

出版商:American Vacuum Society    

年代:1983

数据来源: AIP

ISSN:0734-2101    

DOI:10.1116/1.572184

出版商:American Vacuum Society    

年代:1983

数据来源: AIP

摘要:

An electrochemical source for the reproducible generation and dosing of halogens in UHV systems is described. This approach minimizes corrosion damage to vacuum hardware and lends itself to the study of both submonolayer and multilayer halogen adsorption. The corrosive action of halogens on ultrahigh vacuum components has necessitated the development of molecular halogen beam sources, which allowinsitugeneration and dosing of fluorine, chlorine, bromine, and iodine, with a negligible increase in vacuum chamber background pressure. This communication describes the chlorine and bromine sources developed and routinely used in our laboratory. Iodine dosing may be accomplished using a source of similar design. Fluorine, however, because of its highly reactive nature, requires a somewhat different design of source, such as that recently described in detail by Bechtold.1

ISSN:0734-2101    

DOI:10.1116/1.572185

出版商:American Vacuum Society    

年代:1983

数据来源: AIP

摘要:

A simple and convenient method for baking a vacuum system is described which requires less power and shorter bakeout time as compared to conventional baking methods.

ISSN:0734-2101    

DOI:10.1116/1.572186

出版商:American Vacuum Society    

年代:1983

数据来源: AIP

ISSN:0734-2101    

DOI:10.1116/1.572187

出版商:American Vacuum Society    

年代:1983

数据来源: AIP

摘要:

A carousel transfer system for a UHV surface analysis chamber has been designed and built. (AIP)

ISSN:0734-2101    

DOI:10.1116/1.572188

出版商:American Vacuum Society    

年代:1983

数据来源: AIP

ISSN:0734-2101    

DOI:10.1116/1.572189

出版商:American Vacuum Society    

年代:1983

数据来源: AIP

ISSN:0734-2101    

DOI:10.1116/1.572263

出版商:American Vacuum Society    

年代:1983

数据来源: AIP

ISSN:0734-2101    

DOI:10.1116/1.572264

出版商:American Vacuum Society    

年代:1983

数据来源: AIP