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Rotational Energy Transfer Cross Sections in N2-N2 CollisionsRotational inelastic transitions of N2 have been studied in the coupled state (CS, also called centrifugal sudden) and infinite-order-sudden (IOS) approximations, using the N2-N2 rigid-rotor potential of van der Avoird et al. For benchmarking purposes, close coupling (CC) calculations have also been carried out over a limited energy range and for even j - even j collisions only. Both the CC and CS cross sections have been obtained with and without exchange symmetry, whereas exchange is neglected in the IOS calculations. The CS results track the CC cross sections rather well. At total energies between 113 to 219 cm(exp -1) the average deviation is 14%. The deviation decrease with increasing energy, indicating that the CS approximation can be used as a substitute at higher energies when the CC calculations become impractical. Comparison between the CS and IOS cross sections at the high energy end of the CS calculation, 500 - 680 cm(exp-1), shows significant differences between the two. In addition, the IOS results exhibits sensitivity to the amount of inelasticity and the results for large DELTA J transitions are subjected to bigger errors. At total energy 113 cm(exp -1) and above, the average deviation between state-to-state cross sections calculated with even and odd exchange symmetries is 1.5%.
Document ID
20020035546
Acquisition Source
Ames Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Huo, Winifred M.
(NASA Ames Research Center Moffett Field, CA United States)
Green, Sheldon
(NASA Goddard Inst. for Space Studies New York, NY United States)
Langhoff, Stephen R.
Date Acquired
August 20, 2013
Publication Date
January 1, 1995
Subject Category
Inorganic, Organic And Physical Chemistry
Meeting Information
Meeting: ICPEAC XIX
Location: Wistler
Country: Canada
Start Date: July 26, 1995
End Date: August 1, 1995
Funding Number(s)
PROJECT: RTOP 242-80-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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