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Laboratory microwave spectroscopy of the linear C3H and C3D radicals and related astronomical observation
Yamamoto, Satoshi; Saito, Shuji; Suzuki, Hiroko; Deguchi, Shuji; Kaifu, Norio; Ishikawa, Shin-Ichi; Ohishi, Masatoshi
AA(Nagoya, University, Japan), AB(Nagoya, University, Japan), AC(Nobeyama Radio Observatory, Minamisaku, Japan), AD(Nobeyama Radio Observatory, Minamisaku, Japan), AE(Nobeyama Radio Observatory, Minamisaku, Japan)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 1, 1990, p. 363-369. (ApJ Homepage)
Publication Date:
Atomic and Molecular Physics
NASA/STI Keywords:
Astronomical Spectroscopy, Free Radicals, Interstellar Chemistry, Microwave Spectrometers, Propylene, Radio Spectroscopy, Deuterium Compounds, Hamiltonian Functions, Microwave Spectra, Molecular Energy Levels, Vibrational Spectra
Bibliographic Code:


Laboratory observations of rotational spectral lines of the C3H and C3D radicals in their ground and vibrationally excited states are compared with astronomical observations with the Nobeyama Radio Observatory's 45-m radio telescope carried out toward IRC + 10216 in May 1988. The C3H radical is found to have an extremely low vibrationally excited state, nu4(2Sigma mu), caused by the Renner-Teller effect in the nu4 (CCH bending) state. The radio telescope observations failed to detect the lines of the vibrationally excited C3H at the rms noise level of 24 mK. The upper limit to the column density of the nu4(2Sigma mu) is estimated to be 3 x 10 to the 12th/sq cm.

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