Zeitschrift für Physik D Atoms, Molecules and Clusters

, Volume 40, Issue 1, pp 327–330

Fragmentation of clusters induced by collision with a solid surface: comparison of antimony and bismuth cluster ions

Authors

  • T.M. Bernhardt
    • Walther-Nernst-Institut für Physikalische und Theoretische Chemie der Humboldt-Universität zu Berlin
  • B. Kaiser
    • Walther-Nernst-Institut für Physikalische und Theoretische Chemie der Humboldt-Universität zu Berlin
  • K. Rademann
    • Walther-Nernst-Institut für Physikalische und Theoretische Chemie der Humboldt-Universität zu Berlin
Article

DOI: 10.1007/s004600050219

Cite this article as:
Bernhardt, T., Kaiser, B. & Rademann, K. Z Phys D - Atoms, Molecules and Clusters (1997) 40: 327. doi:10.1007/s004600050219

Abstract

Mass-selected antimony cluster ions Sbn+ (n = 3-12) and bismuth cluster ions Bi{ntn}+ (n = 3-8) are allowed to collide with the surface of highly oriented pyrolytic graphite at energies up to 350 eV. The resulting fragment ions are analysed in a time-of-flight mass spectrometer. Two main fragmentation channels can be identified. At low impact energies both Sbn+ and Bin+ cluster ions lose neutral tetramer and dimer units upon collision. Above about 150 eV impact energy Sb3+ becomes the predominant fragment ion of all investigated antimony clusters. The enhanced stability of these fragment clusters can be explained in the framework of the polyhedral skeletal electron pair theory. In contrast, Bin+ cluster scattering leads to the formation of Bi3+, Bi2+ and Bi+ with nearly equal abundances, if the collision energy exceeds 75 eV. The integral scattering yield is substantially higher in this case as compared to Sbn+ clusters.

PACS

33.15.Ta34.50.Dy36.40.Qv

Copyright information

© Springer-Verlag 1997