Observations of cumulene carbenes, H2CCCC and H2CCC, in TMC-1

Details Observations of cumulene carbenes, H2CCCC and H2CCC, in TMC-1 Observations of cumulene carbenes, H2CCCC and H2CCC, in TMC-1

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43..607k&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 4, 1991, p. 607-619. Research supported by U.S.-Japan

Astronomy and Astrophysics

Astronomy

34

Carbenes, Dark Matter, Interstellar Matter, Molecular Chains, Molecular Clouds, Abundance, Interstellar Chemistry, Molecular Energy Levels, Ortho Hydrogen, Para Hydrogen, Taurus Constellation

Scientific paper

Attention 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.

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