Gas-phase diatomic trications of Se 2 3+, Te 2 3+, and LaF 3+

K. Franzreb, J. Hrušák, M. E. Alikhani, J. Lörinčík, R. C. Sobers, Peter Williams

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25 Scopus citations

Abstract

Three gas-phase diatomic trications Se 2 3+, Te 2 3+, and LaF 3+ have been produced by Ar + ion beam sputtering of Se, Te, and LaF 3 surfaces, respectively. These exotic molecular ions were detected at noninteger m/z values in a magnetic sector mass spectrometer for ion flight times of ≥13 μs that correspond to lower limits of their respective lifetimes. Se 2 3+ and Te 2 3+ were unambiguously identified by their characteristic isotopic abundances. Ab initio calculations of the electronic structures of Se 2 3+, Te 2 3+, and LaF 3+ show that these molecular trications are metastable with respect to dissociation into fragment ions of Se 2++Se +, Te 2++Te +, and La 2++F +, respectively. Their barrier heights are about 0.49, 0.29, and 0.53 eV, and the equilibrium internuclear distances (bond lengths) are about 0.23, 0.27, and 0.26 nm, respectively. The gas-phase diatomic dications Se 2 2+ and Te 2 2+ were also observed and unambiguously identified. They were found to be long-lived metastable molecules as well, whereas LaF 2+ is thermochemically stable.

Original languageEnglish (US)
Pages (from-to)12293-12302
Number of pages10
JournalJournal of Chemical Physics
Volume121
Issue number24
DOIs
StatePublished - Dec 22 2004

ASJC Scopus subject areas

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

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    Franzreb, K., Hrušák, J., Alikhani, M. E., Lörinčík, J., Sobers, R. C., & Williams, P. (2004). Gas-phase diatomic trications of Se 2 3+, Te 2 3+, and LaF 3+ Journal of Chemical Physics, 121(24), 12293-12302. https://doi.org/10.1063/1.1821496