High-level ab initio studies of the structure, vibrational spectra, and energetics of S 3

Joseph S. Francisco, James Lyons, Ian H. Williams

Research output: Contribution to journalArticle

26 Scopus citations


Observation of mass-dependent and non-mass-dependent sulfur isotope fractionations in elemental sulfur is providing new insight into the nature of the sulfur cycle in the atmosphere. Interpretation of the experimental isotope data requires estimation of the energetics for the reaction S+ S2 → S3 (isoelectronic with O+ O2 → O3). Key molecular properties of the S3 potential-energy surface, such as vibrational frequencies and isotopic shifts, are presented that can be used to assess the mass-dependent fractionation effect. Ab initio results are compared to the available experimental results for S2 to evaluate the reliability of the computational results for S3. The S-S bond dissociation energy for S3 is determined to be 60.9±1 kcal mol-1.

Original languageEnglish (US)
Article number054302
JournalJournal of Chemical Physics
Issue number5
StatePublished - Sep 5 2005
Externally publishedYes


ASJC Scopus subject areas

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

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