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Title:
The detection of interstellar methyldiacetylene (CH3C4H)
Authors:
MacLeod, J. M.; Avery, L. W.; Broten, N. W.
Affiliation:
AA(National Research Council, Herzberg Institute of Astrophysics, Ottawa, Canada), AB(National Research Council, Herzberg Institute of Astrophysics, Ottawa, Canada), AC(National Research Council, Herzberg Institute of Astrophysics, Ottawa, Canada)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 282, July 15, 1984, p. L89-L92. (ApJL Homepage)
Publication Date:
07/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ACETYLENE, INTERSTELLAR MATTER, METHYL COMPOUNDS, MOLECULAR CLOUDS, ABUNDANCE, CARBON, CYANO COMPOUNDS, MOLECULAR CHAINS, MOLECULAR ROTATION, RADIAL VELOCITY
DOI:
10.1086/184312
Bibliographic Code:
1984ApJ...282L..89M

Abstract

The CH3C4H interstellar molecule has been detected in the molecular cloud TMC-1, with a total column density lying in the range of 2.0 x 10 to the 13th/sq cm to 3.1 x 10 to the 13th/sq cm for 4-6 K rotational temperatures. By comparison with CH3C2H, the chemical process through which two carbon atoms are added to the chain to produce CH3C4H yields an abundance decrease of a factor of 2-4, as in the case for linear cyanopolyynes. Since this relative abundance factor of approximately 3 is common to several different types of carbon chain molecules, it is suggested to reflect the relative abundance of pure carbon chains of different lengths.

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