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Adsorption of oxygen on clean and barium covered copper surfaces: an XPS, UPS and AES study

Ayyoob, M and Hegde, MS (1984) Adsorption of oxygen on clean and barium covered copper surfaces: an XPS, UPS and AES study. In: Surface Science, 147 (3). pp. 361-376.

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Abstract

XPS studies of oxygen on barium covered copper surface show two types of dissociatively chemisorbed species, viz. $O^{x-}$ (529.5 eV) and $O^{y-}$ (531.6 eV) (x) < y < 2). This is supported by He II spectra which show two peaks at 6 and 9.2 eV below $E_F$. While dissociatively chemisorbed oxygen on clean copper seen at 530 eV is strongly held even up to 700 K, the oxygen on barium covered surface starts desorbing at 450 K. The surface stoichiometry of oxygen to barium has been estimated both as functions of barium coverage and of temperature for a given barium concentration. The $Cu(L_3VV)/Cu(L_3M_{23}M_{23})$ Auger ratio technique has been employed to show charge transfer from barium to copper on the barium covered surface and from copper to oxygen on subsequent oxygen adsorption.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science B.V.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 26 Mar 2008
Last Modified: 19 Sep 2010 04:43
URI: http://eprints.iisc.ernet.in/id/eprint/13497

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