Small gas-phase dianions of Zn3O42-, Zn4O52-, CuZn2O4 2-, Si2GeO62-, Ti2O 52- and Ti3O72-

Klaus Franzreb, Thomas Sommerfeld, Peter Williams

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We have searched for new species of small oxygen-containing gas-phase dianions produced in a secondary ion mass spectrometer by Cs+ ion bombardment of solid samples with simultaneous exposure of their surfaces to O2 gas. The targets were a pure zinc metal foil, a copper-contaminated zinc-based coin, two silicon-germanium samples (Si 1-xGex (with x = 6.5% or 27%)) and a piece of titanium metal. The novel dianions Zn3O42-, Zn 4O52-, CuZn2O4 2-, Si2GeO62-, Ti2O 52- and Ti3O72- have been observed at half-integer m/z values in the negative ion mass spectra. The heptamer dianions Zn3O42- and Ti 2O52- have been unambiguously identified by their isotopic abundances. Their flight times through the mass spectrometer are ∼20 μs and ∼17 μs, respectively. The geometrical structures of the two heptamer dianions Ti2O52-, and Zn 3O42- are investigated using ab initio methods, and the identified isomers are compared to those of the novel Ge 2O52- and the known Si2O 52- and Be3O42- dianions.

Original languageEnglish (US)
Pages (from-to)846-852
Number of pages7
JournalPhysical Chemistry Chemical Physics
Issue number7
StatePublished - Feb 15 2007

ASJC Scopus subject areas

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


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