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Laboratory and astronomical detection of the deuterated ethynyl radical CCD
Vrtilek, J. M.; Gottlieb, C. A.; Langer, W. D.; Thaddeus, P.; Wilson, R. W.
AA(Nasa, Goddard Institute for Space Studies, New York), AB(Nasa, Goddard Institute for Space Studies, New York), AC(Columbia University, New York), AD(AT&T Bell Laboratories, Holmdel, NJ), AE(AT&T Bell Laboratories, Holmdel, NJ)
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 296, Sept. 15, 1985, p. L35-L38. (ApJL Homepage)
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NASA/STI Keywords:
Deuterium Compounds, Hydrocarbons, Interstellar Chemistry, Molecular Clouds, Radicals, Cosmochemistry, Hyperfine Structure, Orion Nebula, Spectral Resolution
Bibliographic Code:


Two rotational transitions of CCD, N = 1-2 at 144 GHz and 2-3 at 216 GHz, were detected in a laboratory glow discharge through deuterated acetylene and helium, after which one, N = 2-1, was detected toward the rich molecular cloud behind the Orion Nebula. The 144 GHz transition is a well-resolved spin doublet split by 55 MHz, the components of which contain hyperfine structure of the order of 1 MHz, so far only partially resolved. From observations toward two positions in Orion, at and near the Kleinmann-Low nebula, the column density of CCD is determined to be 1.8 x 10 to the 13th/sq cm and the isotopic ratio CCD/CCH = 0.05. CCD was not detected at two positions in TMC-1.

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