A correlated ab initio study of the Ã2Π ← Χ̃ 2Σ+ transition in MgCCH

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The Ã2Π ← Χ̃ 2Σ+ transition in MgCCH was studied with correlation consistent basis sets and single-and multireference correlation methods. The Ã2Π excited state was characterized in detail; the Χ̃ 2Σ+ ground state has been described elsewhere recently. The estimated complete basis set (CBS) limits for valence correlation, including zero-point energy corrections, are 22668, 23191, and 22795 cm-1 for the RCCSD(T), MRCI, and MRCI + Q methods, respectively. A core-valence correction of + 162 cm-1 shifts the RCCSD(T) value to 22830 cm-1, in good agreement with the experimental result of 22807 cm-1.

Original languageEnglish (US)
Pages (from-to)299-305
Number of pages7
JournalChemical Physics Letters
Issue number1-3
StatePublished - Aug 1 1997
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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