The millimeter wave spectrum of the 13C16O dimer

L. A. Surin, D. N. Fourzikov, B. S. Dumesh, G. Winnewisser, Jian Tang, A. R.W. McKellar

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12 Citations (Scopus)


The millimeter wave spectrum of the isotopically substituted CO dimer, (13C16O)2, has been studied for the first time, confirming and extending a recent infrared study. Eighty-seven transitions in the 77-180 GHz region have been assigned and analyzed in terms of a model-independent term value scheme involving 57 rotational levels with J = 0-8. The levels can be classified into 7 "stacks" which have symmetry classifications of either A-/B+ or A+/B - and K-values of either 0 or 1. For the normal isotope, symmetry and nuclear spin statistics cause alternate rotational levels to be missing, but for (13C16O)2 all levels are present with an intensity alternation of 1:3 between A and B symmetries. The four A -/B+ stacks have not previously been observed, and the lowest of them establishes the tunneling splitting of (13C 16O)2 to be 3.769cm-1, slightly larger than the (12C16O)2 value of 3.731cm-1. A large amount of precise experimental data is now available for the CO dimer, which should lead to greater theoretical insight into its structure and tunneling dynamics. Crown copyright

Original languageEnglish
Pages (from-to)132-137
Number of pages6
JournalJournal of Molecular Spectroscopy
Issue number2
Publication statusPublished - Feb 2004
Externally publishedYes


  • Dimer
  • Millimeter
  • Van der Waals complex

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry


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