Effect of hydrogen chemisorption on the photoionization threshold of isolated transition metal clusters

M. R. Zakin, D. M. Cox, R. L. Whetten, D. J. Trevor, A. Kaldor

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Large increases in the photoionization threshold energies of small Vx, NBx, and Fex clusters (x = 3-25) induced by chemisorption of H2 have been observed using photoionization time-of-flight mass spectrometry of a molecular beam. These shifts exhibit a definite dependence both on the number of atoms constituting the bare metal cluster and on the number of chemisorbed hydrogens, and are particularly large (≳ 0.8 eV) for multiple-H2 chemisorption on small clusters. A simple frontier orbital model for the chemisorption process predicts the direction of adsorbate-induced shifts in cluster ionization threshold for both H2 and NH3 as adsorbates.

Original languageEnglish (US)
Pages (from-to)223-228
Number of pages6
JournalChemical Physics Letters
Volume135
Issue number3
DOIs
StatePublished - Apr 3 1987
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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