Photoelectron spectroscopy of tin and lead cluster anions: Application of halogen-doping method

Y. Negishi, H. Kawamata, A. Nakajima, K. Kaya

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Abstract

Electronic properties of tin (Sn) and lead (Pb) cluster anions were studied using photoelectron spectroscopy (PES) with a magnetic bottle-type electron spectrometer, where the feasibility of a halogen-doping method we recently developed was explored. The binary cluster anions containing a chlorine atom (Cl) were produced by a laser vaporization of a target rod in a He carrier gas mixed with a small amount of CCl4 gas. Comparing the PES of SnnCl- and those of Sn- n, it was found that the doped Cl atom in SnnCl- deprives each Sn- n cluster of the excess electron without any serious rearrangement of the Snn framework, which is similar to our previous work on SinF- and GenF-. The halogen-doping method enables us to reveal the HOMO-LUMO gap of the corresponding neutral cluster of the Snn clusters, showing that the Snn clusters are semiconductor clusters, especially below n=30, similar to the Sin and the Gen clusters. For the Pbn clusters, however, the halogen-doping method was inapplicable, which implies that the Pbn clusters are different from the other group-14 clusters, probably exhibiting a metallic nature.

Original languageEnglish
Pages (from-to)117-125
Number of pages9
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume106
Issue number2-3
Publication statusPublished - 2000 Feb

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Keywords

  • Cluster anions
  • Halogen-doping
  • Lead
  • Photoelectron spectroscopy
  • Tin

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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