NDLI: Gas surface interactions occurring on materials within ultrahigh vacuum. ph.d. thesis - va. polytechnic inst.

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Gas surface interactions occurring on materials within ultrahigh vacuum. ph.d. thesis - va. polytechnic inst.

Content Provider	NASA Technical Reports Server (NTRS)
Author	Outlaw, R. A.
Copyright Year	1972
Description	The physical adsorption of nitrogen on the chemically cleaned surfaces of Pyrex, 347 stainless steel and polycrystalline nickel was investigated over the pressure range 1 x 10 to the minus 12th power to 3 x 10 to the minus 7th power torr and for temperatures 77.4 and 87.4 K. The adsorption data were linearized by the Dubinin-Radushkevich equation. The metal surfaces were cleaned by electron impact desorption (EID) and the desorbed gases analyzed by mass spectrometry. Work function measurements were also used to indicate changes in the surface condition following an EID dose. At least a monolayer of gas was observed to desorb from the metal surfaces. The isotherms revealed that the metal surfaces were very heterogeneous and that the Pyrex surface had been leached. The calculated isosteric heats of adsorption indicated that the relative order of the physical binding of nitrogen to the solids was 347 stainless steel Pyrex nickel. A relationship was observed to exist in the dynamic technique between the equilibration time and the pressure above the absorbed layer. The slope of the log-log plot of these parameters was found to be sensitive to the surface heterogeneity and may be related to the activation energy for surface diffusion of physically absorbed molecules.
File Size	3230887
Page Count	127
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19720020923
Archival Resource Key	ark:/13960/t8dg1hd7w
Language	English
Publisher Date	1972-05-01
Access Restriction	Open
Subject Keyword	Materials, Nonmetallic Work Functions Adsorption Nitrogen Steels Ultrahigh Vacuum Activation Energy Borosilicate Glass Gas-metal Interactions Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Thesis

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