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Adsorption of oxygen on W/100/ - Adsorption kinetics and structureThe adsorption of oxygen on W(100) single-crystal surfaces is studied by Auger electron spectroscopy (AES), flash desorption, low-energy electron diffraction (LEED), and retarding-field work-function measurements. The AES results reveal stepwise changes in the sticking coefficients in the coverage range 0 to 1 and activated adsorption at higher coverages. Upon room-temperature adsorption, a series of complex LEED patterns is observed. In layers adsorbed at 1050 K and cooled to room temperature, the p(2 x 1) structure is the first ordered structure observed. This structure shows a reversible order-disorder transition between 700 and 1000 K and is characterized by a work function which is lower than that of the clean surface. Heating room-temperature adsorbates changes their structure irreversibly. At temperatures below 750 K, some new structures are observed.
Document ID
19770027681
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bauer, E.
(NASA Ames Research Center Moffett Field, Calif.; Clausthal, Technische Universitaet, Clausthal, Germany)
Poppa, H.
(NASA Ames Research Center Moffett Field, Calif., United States)
Viswanath, Y.
(NASA Ames Research Center Moffett Field, Calif.; Missouri, University, Rolla, Mo., United States)
Date Acquired
August 8, 2013
Publication Date
August 1, 1976
Publication Information
Publication: Surface Science
Volume: 58
Issue: 2, Au
Subject Category
Inorganic And Physical Chemistry
Accession Number
77A10533
Funding Number(s)
CONTRACT_GRANT: NCA2-OR450-602
CONTRACT_GRANT: NASA ORDER R-05-030-001
Distribution Limits
Public
Copyright
Other

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