Interaction of H2, CO and O2 with a vanadium (111) surface

M. Beutl1, J. Lesnik1, E. Lundgren2, C. Konvicka2, P. Varga2, K.D. Rendulic1

1Institut für Festkörperphysik, Technische Universität Graz, A-8010 Graz, Austria
2Institut für Allgemeine Physik, Technische Universität Wien, A-1040 Wien, Austria

Surf. Sci. 447 (2000) 245-258

Adsorption of hydrogen and deuterium on V(111) is governed by dynamical steering at low molecular energies whereas at high beam energies direct adsorption is observed. Strong rotational effects and clear isotope effects in the adsorption dynamics of H2 and D2 can be seen. At elevated surface temperatures hydrogen dissolves in the bulk; the absorption coefficient is strongly dependent on surface temperature. For CO a large fraction dissociates upon adsorption. At the clean surface an intrinsic precursor facilitates adsorption and at finite coverages an extrinsic precursor leads to a sticking coefficient independent of coverage. Oxygen can adsorb up to a saturation coverage of 3.8 monolayers followed by surface oxidation. For all three gases calibration procedures for surface coverages are presented as well as quantitative values for the sticking coefficients.

Corresponding author: K.D. Rendulic (Graz). Reprints also available from P. Varga (varga< encoded email address >).

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