Vibrational relaxation of N2 by collision with He atoms
- 1 April 1986
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 84 (7), 3788-3797
- https://doi.org/10.1063/1.450089
Abstract
A quantum mechanical study of vibrational relaxation in the collision of N2 with 3He and 4He is reported. An ab initio potential energy surface has been computed using the coupled electron pair approximation with an extended basis set. Cross sections for v=1 → 0 vibrational relaxation have been calculated on this surface by using the centrifugal sudden approximation (CSA). The calculated vibrational relaxation rate coefficients show a very encouraging agreement with those measured in laser fluorescence experiments for the temperature range 82–291 K. Over this temperature range the rate coefficients increase by a factor close to 100. The CSA computations are also used to test the accuracy of the vibrational close coupling, rotational infinite order sudden, and the breathing sphere approximations.Keywords
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