Photoelectron spectroscopy of cobalt oxide cluster anions

Axel Pramann, Kiichirou Koyasu, Atsushi Nakajima, Koji Kaya

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Photoelectron spectroscopy of size-selected ConOm- clusters (n = 4-20; m = 0-2) is performed in a pulsed molecular beam experimental at photon energies of 3.49 and 4.66 eV. Cobalt oxide cluster anions are generated in a laser vaporization source and the photoelectron spectra are measured with a magnetic bottle photoelectron spectrometer. The size-dependent evolution of the electronic structure of the oxide clusters is discussed in terms of cluster composition. Threshold binding energy features are mainly contributed from Co d-derived orbitals throughout the complete series, indicating that the incoming oxygen atoms cause a minor influence on the electronic structures. Although for n > 13 EAs and VDEs of Con and ConOm clusters overlap within the experimental resolution, at smaller cluster sizes, the values increase in the order of Con < ConO < ConO2. For Co4O3- and Co5O3-, the spectra indicate the presence of isomers with low EAs peroxo and ozonide isomers. To compare the different channels of oxygen chemisorption, relative dissociation energies are determined via thermochemical cycles.

Original languageEnglish
Pages (from-to)4891-4896
Number of pages6
JournalJournal of Physical Chemistry A
Volume106
Issue number19
DOIs
Publication statusPublished - 2002 May 16

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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