MOLECULAR COLLISION CROSS SECTIONS AND VIBRATIONAL RELAXATION IN CARBON MONOXIDE
Journal Article
·
· Proc. Phys. Soc. (London)
A method for the calculation of cross sections for processes involving the exchange of vibrational and translational energy on collision of molecules with internally structureless particles is described. On the assumption that the excited molecule is a simple harmonic vibrator and that the molecular interaction potential may be represented by a spherically symmetric Lennard-Jones function, the partial wave scattering equations were obtained in a form suitable for direct numerical integration. Coupling between any selected number of energetically accessible molecular vibrational states can be retained in this calculation. The collision cross sections are then derived in terms of the asymptotic phases and the amplitudes of the numerical solutions. This treatment of molecular collisions was applied to a study of vibrational relaxation in carbon monoxide. Cross sections were calculated using the Lennard-Jones interaction constants tabulated by Hirschfelder et al. These cross sections are employed for the determination of the vibrational relaxation time in carbon monoxide as a function of temperature. The results are less by a factor of 2.5 than the experimental values over a temperature range of 1000--4500 deg K. (auth)
- Research Organization:
- General Dynamics/Astronautics, San Diego, Calif.
- NSA Number:
- NSA-18-016679
- OSTI ID:
- 4064051
- Journal Information:
- Proc. Phys. Soc. (London), Journal Name: Proc. Phys. Soc. (London) Vol. Vol: 83
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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