The millimeter/submillimeter rotational spectrum of CaCCH(X2Σ+)

M. A. Anderson, L. M. Ziurys

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26 Scopus citations


The pure rotational spectrum of the CaCCH radical (X2Σ+) has been measured in the laboratory using millimeter/submillimeter direct absorption spectroscopy. The species was created in a d.c. discharge by the reaction of calcium vapor and acetylene. Twenty-two rotational transitions of this molecule were recorded in the frequency range 230-380 GHz to an accuracy of ± 150 kHz. Spin-rotation splittings, but no proton hyperfine structure, were observed for CaCCH. The data were analyzed using a 2Σ Hamiltonian, and rotational and fine structure constants were determined. These measurements have resulted in accurate rest frequencies for CaCCH to be used for astronomical searches. A calcium-bearing molecule has yet to be observed in interstellar or circumstellar gas.

Original languageEnglish (US)
Pages (from-to)L57-L60
JournalAstrophysical Journal
Issue number1 PART 2
StatePublished - May 1 1995


  • ISM: molecules
  • Line: identification
  • Molecular data

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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