Applied Physics B

, Volume 73, Issue 4, pp 417–423

Stability patterns and ionization potentials of CrnOm clusters (n=3-50, m=0,1,2)

  • X. Wang
  • S. Neukermans
  • F. Vanhoutte
  • E. Janssens
  • G. Verschoren
  • R.E. Silverans
  • P. Lievens

DOI: 10.1007/s003400100690

Cite this article as:
Wang, X., Neukermans, S., Vanhoutte, F. et al. Appl Phys B (2001) 73: 417. doi:10.1007/s003400100690
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Abstract.

Chromium and chromium oxide clusters (CrnOm, n=3–50, m=0,1,2) were produced by a laser vaporization cluster source, and investigated by laser photoionization spectroscopy and photofragmentation spectroscopy in combination with mass spectrometry. Ionization potentials for CrnOm clusters (m=1,2) deduced from photoionization spectroscopy measurements show a smoothly decreasing trend with size similar to the behavior of other transition metals. Superimposed on this is a diffuse step from 8 to 11 chromium atoms, possibly indicating a structural transition. Mass-abundance spectra recorded with low-fluence, high-photon-energy ionization (6.4 eV) reveal stability steps for CrnOm clusters (n=3–50, m=1,2), corresponding to icosahedral geometrical shell closings insensitive to the oxygen content. These magic numbers are also found for CrnOm+ clusters (n=3–50, m=0,1,2) investigated with photofragmentation.

PACS: 36.40.Cg; 36.40.Mr; 36.40.Qv

Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • X. Wang
    • 1
  • S. Neukermans
    • 1
  • F. Vanhoutte
    • 1
  • E. Janssens
    • 1
  • G. Verschoren
    • 1
  • R.E. Silverans
    • 1
  • P. Lievens
    • 1
  1. 1.Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, Celestijnenlaan 200D, 3001 Leuven, BelgiumBE