Photoelectron spectroscopy of transition-metal clusters: Correlation of valence electronic structure to reactivity

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作者：

J Conceicao，RT Laaksonen，LS Wang，T Guo，RE Smalley

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摘要：

Photoelectron spectra of negatively charged iron, cobalt and nickel clusters in the size range of 5 to 20 (4 to 26) and 5 to 20 atoms respectively have been obtained. The electron affinity (E.A.) values along with the reported ionization potential (I.P.) have been used as a probe of the valence electronic structure of these clusters. This information is further used to understand the reactivity of the neutrally charged counterpart clusters of iron, cobalt and nickel with dihydrogen. An excellent anticorrelation between an empirically determined quantity called Ep, defined as IP $-$ EA $-$ e$\sp2$/r, and the reactivity of these clusters is observed. Ep is a direct measure of the polarizability of the clusters; The excellent anticorrelation is consistent with the Pauli Repulsion mechanism and is found to be a significant factor in controlling the reactivity of these clusters.

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关键词：

AROMATICS CHEMISORPTION LOW ENERGY ELECTRON DIFFRACTION (LEED LOW INDEX SINGLE CRYSTAL SURFACES RUTHENIUM

DOI：

10.1103/PhysRevB.51.4668

被引量：

101

年份：

1995