A COMPARATIVE-STUDY OF THE PHOTODISSOCIATION OF PHYSISORBED O-2 ON PT(111) AND GRAPHITE

Authors
SILLER L BENNETT SL CRABTREE HM BENNETT RA WILKES J LAMONT CLA MACDONALD MA PALMER RE FOORD JS
Citation
L. Siller et al., A COMPARATIVE-STUDY OF THE PHOTODISSOCIATION OF PHYSISORBED O-2 ON PT(111) AND GRAPHITE, Journal of physics. Condensed matter, 9(27), 1997, pp. 5815-5822
Citations number
27
Categorie Soggetti
Physics, Condensed Matter
Journal title
Journal of physics. Condensed matter → ACNP
ISSN journal
09538984
Volume
9
Issue
27
Year of publication
1997
Pages
5815 - 5822
Database
ISI
SICI code
0953-8984(1997)9:27<5815:ACOTPO>2.0.ZU;2-R
Abstract
A comparative study of photodesorption from physisorbed oxygen layers on (highly oriented pyrolytic) graphite and Pt(111)surfaces has been c arried out using continuously tuneable synchrotron radiation in the en ergy range 13-35 eV. The photodesorption of both O+ and O- species is detected. Through monitoring the ion yields as a function of the photo n energy and coverage we have proposed a new mechanism for photodesorp tion of O- ions induced by inelastic scattering and attachment of phot oelectrons originating from the adsorbate layer in the photon energy r egion between 25 and 30 eV.