A combined EELS-XPS Study of Molecularly Chemisorbed Oxygen on Silver Surfaces: Evidence for Superoxo and Peroxo Species

Prabhakaran, K and Rao, CNR (1987) A combined EELS-XPS Study of Molecularly Chemisorbed Oxygen on Silver Surfaces: Evidence for Superoxo and Peroxo Species. In: Surface Science, 186 (3). L575-L580.

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Abstract

Both superoxo and peroxo species are formed when oxygen is adsorbed on a polycrystalline Ag surface as evidenced by the characteristic O-O stretching frequencies in the EEL spectra. Based on temperature-variation studies of the vibration bands in the EELS and of the O(ls) core level peaks in the XPS, characteristic O(ls) binding energies are assigned to the two molecular species; the superoxo species is associated with a significantly higher binding energy as expected. The superoxo species appears to be relatively less thermally stable than the peroxo species, being associated with a \sim 1300 $cm^{-1}$ stretching vibration, the highest O-O stretching frequency observed so far due to a chemisorbed species.

Item Type:	Journal Article
Publication:	Surface Science
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	11 Aug 2008
Last Modified:	19 Sep 2010 04:47
URI:	http://eprints.iisc.ac.in/id/eprint/14907

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