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Measurements of the H2(13)CO ortho/para ratio in cold dark molecular cloudsH2(13)CO has been detected for the first time toward cold dark molecular clouds using the NRAO 12 m telescope. The H2(13)CO ortho/para abundance ratio R for B335, which we report as R approximately 1.7, suggests equilibrium at the local kinetic temperature and appears to be distinctly different from that for both TMC-1 and L134N, where R is close to or higher than the statistical value 3. Since only B335 among the observed positions includes an imbedded IR source, this difference may result from heating of the grain surfaces, providing the energy necessary for desorption of formaldehyde formed on the grains.
Document ID
20040090039
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Minh, Y. C.
(Korea Astronomy Observatory Taejon)
Dickens, J. E.
Irvine, W. M.
McGonagle, D.
Date Acquired
August 21, 2013
Publication Date
June 1, 1995
Publication Information
Publication: Astronomy and astrophysics
Volume: 298
Issue: 1
ISSN: 0004-6361
Subject Category
Exobiology
Funding Number(s)
CONTRACT_GRANT: NAGW-436
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Exobiology
NASA Program Exobiology
Non-NASA Center
NASA Discipline Number 52-10

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