Laboratory study of the rotational spectrum of vibrationally excited C2H

Details Laboratory study of the rotational spectrum of vibrationally excited C2H Laboratory study of the rotational spectrum of vibrationally excited C2H

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...186l..14w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 186, no. 1-2, Nov. 1987, p. L14-L16.

Astronomy and Astrophysics

Astrophysics

21

Hydrocarbons, Molecular Excitation, Molecular Spectra, Radio Spectra, Rotational Spectra, Vibrational Spectra, Line Spectra, Millimeter Waves, Molecular Clouds

Scientific paper

The N = 1→2, 2→3 and 3→4 millimeter-wave rotational transitions in the ν2 = 1 level of Χ2Σ+ C2H have been detected in a laboratory discharge through helium and acetylene. Accurate values for the parameters A, B, D, γ, p, pD, q, qD, a, bF, c and d were determined from a least-squares fit of the measured frequencies to an effective Hamiltonian; the hyperfine parameters are the first reported for a vibrationally excited carbon chain radical. An upper limit of TR ≤ 0.3K in IRC +10216 has been established with the IRAM 30 m telescope for two transitions in the N = 1→2 manifold. The accurately measured laboratory frequencies will be used in astronomical searches for vibrationally excited C2H.

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