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Infinite order sudden approximation for rotational energy transfer in gaseous mixturesRotational energy transfer in gaseous mixtures is analyzed within the framework of the infinite order sudden (IOS) approximation, and a new derivation of the IOS from the coupled states Lippman-Schwinger equation is presented. This approach shows the relation between the IOS and coupled state T matrices. The general IOS effective cross section can be factored into a finite sum of 'spectroscopic coefficients' and 'dynamical coefficients'. The evaluation of these coefficients is considered. Pressure broadening for the systems HD-He, HCl-He, CO-He, HCl-Ar, and CO2-Ar is calculated, and results based on the IOS approximation are compared with coupled state results. The IOS approximation is found to be very accurate whenever the rotor spacings are small compared to the kinetic energy, provided closed channels do not play too great a role.
Document ID
19780032161
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Goldflam, R.
(Houston Univ. TX, United States)
Kouri, D. J.
(Houston, University Houston, Tex., United States)
Green, S.
(Houston Univ. TX, United States)
Date Acquired
August 9, 2013
Publication Date
November 1, 1977
Publication Information
Publication: Journal of Chemical Physics
Volume: 67
Subject Category
Atomic And Molecular Physics
Accession Number
78A16070
Funding Number(s)
CONTRACT_GRANT: NSF MPS-74-13719
CONTRACT_GRANT: NSG-7105
CONTRACT_GRANT: NSF CHE-76-18970
Distribution Limits
Public
Copyright
Other

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