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Observations of cumulene carbenes, H2CCCC and H2CCC, in TMC-1Attention is given to the carbon chain molecule H2CCCC, detected in the dark cloud TMC-1 for the first time in the course of a molecular line survey using the Nobeyama 45-m telescope. From nine transitions observed in the frequency region of 17-45 GHz, the total column density of H2CCCC in TMC-1 is derived to be 7.5(+/-2.0) x 10 exp 12/sq cm, which is about half of the value reported in IRC + 10216. Five transitions of a related carbon chain molecule, H2CCC, were also detected in TMC-1. The column density of H2CCC obtained in TMC-1, 2.8(+/-0.9) x 10 exp 12/sq cm, is a factor of three smaller than that of H2CCCC. The ortho-to-para abundance ratios of H2CCCC and H2CCC were found to be 4.2 +/-1.5 and 5.9 +/-2.0, respectively. The chemical reactions of these carbon-chain molecules in dark clouds are discussed.
Document ID
19920034697
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kawaguchi, Kentarou
(Nobeyama Solar Radio Observatory Nobeyama, Japan)
Kaifu, Norio
(Nobeyama Solar Radio Observatory Nobeyama, Japan)
Ohishi, Masatoshi
(Nobeyama Solar Radio Observatory Nobeyama, Japan)
Ishikawa, Shin-Ichi
(Nobeyama Radio Observatory Minamimaki, Japan)
Hirahara, Yasuhiro
(Tokyo, University Japan)
Yamamoto, Satoshi
(Nobeyama Solar Radio Observatory Nobeyama, Japan)
Saito, Shuji
(Nobeyama Solar Radio Observatory Nobeyama, Japan)
Takano, Shuro
(Nagoya University Japan)
Murakami, Akinori
(Mitsubishi Kasei Corp. Yokohama, Japan)
Vrtilek, J. M.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Astronomical Society of Japan, Publications
Volume: 43
Issue: 4 19
ISSN: 0004-6264
Subject Category
Astrophysics
Accession Number
92A17321
Funding Number(s)
CONTRACT_GRANT: NAGW-436
Distribution Limits
Public
Copyright
Other

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