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Rhodium-Cluster Reactivity: Sticking Probabilities Of Some Diatomic Molecules

Author

Listed:
  • M. ANDERSSON

    (Department of Physics, Chalmers University of Technology and Göteborg University, S-412 96 Göteborg, Sweden)

  • L. HOLMGREN

    (Department of Physics, Chalmers University of Technology and Göteborg University, S-412 96 Göteborg, Sweden)

  • A. ROSÉN

    (Department of Physics, Chalmers University of Technology and Göteborg University, S-412 96 Göteborg, Sweden)

Abstract

The reactivity of neutral rhodium clusters towardsD2,N2,O2,CO, andNOhas been investigated and the absolute sticking probability (S) of the first molecule onRh10–Rh50(Rh10–Rh35forD2) was determined. ForO2, the absolute sticking probability of the second molecule was measured. The reactions were made under single-collision-like conditions where the clusters make only one or a few collisions with reactive gas molecules. All molecules butN2react with a high sticking probability on most cluster sizes.N2molecules adsorbed on clusters produced in a liquid-nitrogen-cooled cluster source, while cooling the cluster source did not significantly change S for the other molecules. The sticking probability ofO2andNOonRhnlooked almost the same, monotonically increasing from 0.2/0.4 atn=10to 0.8/0.9 atn=25, and the high S also remains for larger clusters. The sticking probability of CO shows small variations aroundS=0.6over the entire size range. The sticking probability is somewhat lower forD2and substanitially lower forN2(also on cool clusters), and these two molecules display the most distinct variations in S as a function of cluster size, often with coinciding maxima and minima.

Suggested Citation

  • M. Andersson & L. Holmgren & A. Rosén, 1996. "Rhodium-Cluster Reactivity: Sticking Probabilities Of Some Diatomic Molecules," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 3(01), pages 683-686.
    • Handle: RePEc:wsi:srlxxx:v:03:y:1996:i:01:n:s0218625x96001236
    DOI: 10.1142/S0218625X96001236
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