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Measurement of the relaxation frequency of the asymmetric stretching mode of carbon dioxide

Published online by Cambridge University Press:  28 March 2006

J. P. Hodgson  and
R. J. Hine
J. P. Hodgson
Affiliation:
Department of the Mechanics of Fluids, University of Manchester
R. J. Hine
Affiliation:
Department of the Mechanics of Fluids, University of Manchester
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Abstract

The vibrational relaxation frequency of carbon dioxide has been determined by measuring the rate of change of thermal emission in shock waves near 4±3μ. This method of measuring the relaxation frequency depends mainly on the degree of excitation of the asymmetric stretching mode of the molecule, and the results are compared with those of earlier density measurements made in the same shock tube. The gas samples used are not optically thin, and it is shown that self-absorption can be taken into account. The results imply that the relaxation frequency of the asymmetric stretching mode is about 70% of that of the bending mode.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 35 , Issue 1 , 16 January 1969 , pp. 171 - 183
Copyright
© 1969 Cambridge University Press

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