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Collisional excitation of interstellar sulfur dioxideState-to-state rotational excitation rates for the asymmetric top molecule SO2 in collisions with low-energy He atoms have been computed. The intermolecular forces were obtained from an electron gas model, and collision dynamics were treated with the finite-order sudden approximation. The total excitation rate is probably accurate to better than 50 percent; however, individual state-to-state rates may be in error by factors of 2 or 3, and some smaller rates may be accurate only to an order of magnitude. Present results are expected to reflect within the same level of accuracy rates for excitation by collisions with H2 molecules.
Document ID
19870059049
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Palma, Amedeo
(NASA Goddard Institute for Space Studies; Columbia, University New York, United States)
Date Acquired
August 13, 2013
Publication Date
July 1, 1987
Publication Information
Publication: Astrophysical Journal Supplement Series
Volume: 64
ISSN: 0067-0049
Subject Category
Astrophysics
Accession Number
87A46323
Funding Number(s)
CONTRACT_GRANT: NSG-7105
Distribution Limits
Public
Copyright
Other

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