The millimeter/submillimeter rotational spectrum of CaCCH(X2Sigma(+))

Details The millimeter/submillimeter rotational spectrum of CaCCH(X2Sigma(+)) The millimeter/submillimeter rotational spectrum of CaCCH(X2Sigma(+))

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444l..57a&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 444, no. 1, p. L57-L60

Astronomy and Astrophysics

Astrophysics

15

Calcium, Line Spectra, Radicals, Rotational Spectra, Spectroscopic Analysis, Acetylene, Experiment Design, Glow Discharges, Spectrum Analysis

Scientific paper

The pure rotational spectrum of the CaCCH radical (X2 Sigma(+)) 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 2 Sigma 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.

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