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Collision-Induced Rotational Excitations of Interstellar Molecules due to He and H2

Published online by Cambridge University Press:  04 August 2017

M. L. Kurtadikar  and
S. C. Mehrotra
M. L. Kurtadikar
Affiliation:
P.G. Department of Physics J.E.S. College JALNA 431 203 INDIA
S. C. Mehrotra
Affiliation:
Department of Physics Marathwada University AURANGABAD 431 004 INDIA

Abstract

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An Effective Straight-line Trajectory (EST) approach by introducing a parameter RX has been proposed for computations of collision-induced rotational line widths (HWHM) and excitation rates in case of atom-molecule systems under the frame work of Smith, Giraud and Cooper (1976) and molecule-molecule systems under the frame work of normalized semi-classical perturbative approach. An optimised parameter RX, which is a measure of significance of the curved trajectories of the colliding molecules, can be determined from the temperature dependence of collision-induced line widths. the EST approach has been tested for HCl-Ar system and further applied to X-He and X-H2 systems of interstellar interest, where X represents interstellar molecules CO, OCS and HCN. The results are given in Table I and II.

Type
Basic Studies
Information
Symposium - International Astronomical Union , Volume 120: Astrochemistry , 1987 , pp. 47 - 48
Copyright
Copyright © Reidel 1987 

References

1. Kurtadikar, M.L. and Mehrotra, S.C.: 1984, Astrophys. Space Sci. 100, 129.CrossRefGoogle Scholar
2. Smith, E.W., Giraud, M., and Cooper, J.: 1976, J. Chem. Phys. 65, 1256.Google Scholar
3. Mehrotra, S.C.: 1980, Astrophys. Space Sci. 71, 507.Google Scholar
4. Robert, D. and Bonamy, J: 1979, J. Physique 40, 923.Google Scholar