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The C3H2 2(20)-2(11) transition - Absorption in cold dark cloudsThe first observations of the 2(20)-2(11) transition of cyclopropenylidene (C3H2) at 21.6 GHz are described. The most significant finding is that the 2(20)-2(11) transition line is always seen in absorption, in contrast to the 18.3-GHz 1(10)-1(01) resonance line of the ortho species which always appears in emission in cold dust clouds. Thus the former must have an excitation temperature less than the brightness temperature of the universal microwave background and becomes only the second molecule to exhibit such 'refrigeration' below this temperature in cold, dark dust clouds.
Document ID
19870027450
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Matthews, H. E.
(Herzberg Inst. of Astrophysics Ottawa Ontario, Canada)
Avery, L. W.
(National Research Council of Canada Hertzberg Institute of Astrophysics, Ottawa, Canada)
Madden, S. C.
(Herzberg Inst. of Astrophysics Ottawa Ontario, Canada)
Irvine, W. M.
(Massachusetts, University Amherst, United States)
Date Acquired
August 13, 2013
Publication Date
August 15, 1986
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters to the Editor
Volume: 307
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
87A14724
Funding Number(s)
CONTRACT_GRANT: NAGW-436
Distribution Limits
Public
Copyright
Other

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