DISSOCIATION OFO2ON Fe(110)

G. Worthy, C. Cottrell, A. Wight and A. Hodgson
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G. Worthy: Surface Science Research Centre, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK
C. Cottrell: Surface Science Research Centre, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK
A. Wight: Surface Science Research Centre, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK
A. Hodgson: Surface Science Research Centre, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK

Surface Review and Letters (SRL), 1994, vol. 01, issue 04, 501-503

Abstract: The initial sticking coefficient for dissociative chemisorption ofO2on Fe(110) has been measured as a function of translational energy, incidence angle, and surface temperature. Dissociation is activated at translational energies above 100 meV, with the sticking probability rising from 0.26 at low energy to>0.9for energies above 400 meV. At low energies the sticking probability increases as the surface temperature and the normal component of the momentum are reduced, indicating dissociation proceeds via trapping into a molecular precursor state. The initial saturation coverage at room temperature, calibrated from the ordered LEED phases, is 2.2 monolayers with both the saturation coverage and the uptake kinetics being sensitive to the surface temperature.

Date: 1994
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DOI: 10.1142/S0218625X94000527

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