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Metal Cluster Oxidation: Sticking Probabilities and Ionization Potential Shiffs

Published online by Cambridge University Press:  15 February 2011

Mats Andersson ,
Lotta Holmgren ,
John L. Persson ,
ThorbjÖrn Åklint  and
Arne RosÉn
Mats Andersson
Affiliation:
Department of Physics, Chalmers University of Technology and University of Göteborg, S-412 96 Göteborg, Sweden
Lotta Holmgren
Affiliation:
Department of Physics, Chalmers University of Technology and University of Göteborg, S-412 96 Göteborg, Sweden
John L. Persson
Affiliation:
Department of Physics, Chalmers University of Technology and University of Göteborg, S-412 96 Göteborg, Sweden
ThorbjÖrn Åklint
Affiliation:
Department of Physics, Chalmers University of Technology and University of Göteborg, S-412 96 Göteborg, Sweden
Arne RosÉn
Affiliation:
Department of Physics, Chalmers University of Technology and University of Göteborg, S-412 96 Göteborg, Sweden
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Abstract

This study deals with the initial oxidation of some 3d metal clusters in gas phase. In the experiments neutral metal clusters in a supersonic beam are made to collide with one or a few oxygen molecules in a reaction cell. The reaction products are detected with photoionization and mass spectrometry. By comparing the abundance of unreacted and reacted clusters, absolute sticking probabilities (S) can be determined. Transition metals with open d shells, e.g. Ni, have high, almost constant S for O2 on clusters containing more than 20 atoms. The size evolution of S for Cu, on the other hand, shows repeated minima and maxima. Cluster sizes which have high ionization potentials (IPs) and closed electronic shells, according to the spherical jellium model, are the ones with the lowest S. The IPs of CunO2 clusters have also been investigated. Compared with the IPs of the pure Cu clusters, the IPs of the oxidized clusters are generally higher and the large drops at the shell openings are less distinct.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 351: Symposium V – Molecularly Designed Ultrafine/Nanostructured Materials , 1994 , 299
Copyright
Copyright © Materials Research Society 1994

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References

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