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- W4231459426 endingPage "431" @default.
- W4231459426 startingPage "323" @default.
- W4231459426 abstract "This chapter elaborates the physical processes, technology, and applications of ultrahigh vacuum (UHV). Ultrahigh vacuum may be considered as the region of pressure below 10-8 Torr. No accommodation coefficient measurements have been done in UHV systems, although the results of Schäfer and Gerstacker explicitly show that the accommodation coefficient depends upon the degree of outgassing of the surface. For many materials in a vacuum system the residual pressure will be the vapor pressure of the material. All the secondary effects discussed in this chapter show radical dependence on the presence of adsorbed gases, making a large fraction of early experiments of questionable quantitative value. Only the ionization gauge, in its various forms, has adequate sensitivity for the measurement of total pressure in the UHV region. A less general, but highly sensitive method for partially analyzing the gases in UHV has been described by Redhead. Great advances have been made in the past few years in achieving UHV in the large and complex systems required for controlled thermonuclear machines." @default.
- W4231459426 created "2022-05-12" @default.
- W4231459426 creator A5029577931 @default.
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- W4231459426 date "1963-01-01" @default.
- W4231459426 modified "2023-10-05" @default.
- W4231459426 title "Ultrahigh Vacuum" @default.
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