Spezzano, S., Gupta, H., Bruenken, S., Gottlieb, C. A., Caselli, P., Menten, K. M., Mueller, H. S. P., Bizzocchi, L., Schilke, P., McCarthy, M. C. and Schlemmer, S. (2016). A study of the C3H2 isomers and isotopologues: first interstellar detection of HDCCC. Astron. Astrophys., 586. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

The partially deuterated linear isomer HDCCC of the ubiquitous cyclic carbene (c-C3H2) was observed in the starless cores TMC-1C and L1544 at 96.9 GHz, and a confirming line was observed in TMC-1 at 19.38 GHz. To aid the identification in these narrow line sources, four centimetre-wave rotational transitions (two in the previously reported K-a = 0 ladder and two new ones in the K-a = 1 ladder) and 23 transitions in the millimetre band between 96 and 272 GHz were measured in high-resolution laboratory spectra. Ten spectroscopic constants in a standard asymmetric top Hamiltonian allow the main transitions of astronomical interest in the K-a <= 3 rotational ladders to be calculated to within 0.1 km s(-1) in radial velocity up to 400 GHz. Conclusive identification of the two astronomical lines of HDCCC was provided by the VLSR, which is the same as for the normal isotopic species (H2CCC) in the three narrow line sources. In these sources, deuterium fractionation in singly substituted H2CCC (HDCCC/H2CCC similar to 4-19%) is comparable to that in c-C3H2 (c-C3H2/c-C3HD similar to 5-17%) and similarly in doubly deuterated c-C3H2 (c-C3D2/c-C3HD similar to 3-17%), implying that the efficiency of the deuteration processes in the H2CCC and c-C3H2 isomers are comparable in dark clouds.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Spezzano, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gupta, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bruenken, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gottlieb, C. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Caselli, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, K. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mueller, H. S. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bizzocchi, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
McCarthy, M. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schlemmer, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-285367
DOI: 10.1051/0004-6361/201527460
Journal or Publication Title: Astron. Astrophys.
Volume: 586
Date: 2016
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
CARBON-CHAIN-CHEMISTRY; DEUTERATED MOLECULES; ASTRONOMICAL DETECTION; SMALL HYDROCARBONS; ABUNDANCE RATIO; LINE SURVEY; PROPADIENYLIDENE; CLOUDS; RECOMBINATION; SPECTROSCOPYMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/28536

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