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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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References

Bhangu, J. K. 1966 Shock tube studies of vibrational relaxation in nitrous oxide J. Fluid Mech. 25, 817.Google Scholar
Borrell, P. 1963 NASA N 63–17, 891. See also Molecular Relaxation Processes, Chemical Soc. Publication no. 20. London: Academic Press, 1966.
Camac, M. 1964 CO2 relaxation processes in shock waves. Avco Res. Rep. no. 194.Google Scholar
Gaydon, A. G. & Hurle, I. R. 1963 The Shock Tube in High Temperature Chemical Physics. London: Chapman & Hall.
Greenspan, W. D. & Blackman, V. H. 1957 Approach to thermal equilibrium behind strong shock waves in carbon dioxide and carbon monoxide Bull. Am. Phys. Soc. 2, 217.Google Scholar
Griffith, W. C., Brickl, D. & Blackman, V. H. 1956 Structure of shock waves in polyatomic gases Phys. Rev. 102, 1209.Google Scholar
Hilsenrath, J., Beckett, C. W., Benedict, W. S., Fano, L., Hoge, H. J., Masi, J. F., Nuttall, R. L., Touloukian, Y. S. & Woolley, H. W. 1955 NBS Circ. no. 564.
Hodgson, J. P 1969 The emissivity of carbon dioxide near 4·3μ in the vibrational relaxation regions of shock waves (to be published).
Holbeche, T. A. & Spence, D. A. 1966 A theoretical and experimental investigation of temperature variation behind attenuating shock waves. Proc. Roy. Soc. A 291, 111.Google Scholar
Hooker, W. J. & Millikan, R. C. 1963 Shock tube study of vibrational relaxation in carbon monoxide for the fundamental and first overtone J. Chem. Phys. 38, 214.Google Scholar
Johannesen, N. H. 1961 Analysis of vibrational relaxation regions by means of the Rayleigh-line method J. Fluid Mech. 10, 25.Google Scholar
Johannesen, N. H., Zienkiewicz, H. K., Blythe, P. A. & Gerrard, J. H. 1962 Experimental and theoretical analysis of vibrational relaxation regions in carbon dioxide J. Fluid Mech. 13, 213.Google Scholar
Johannesen, N. H., Zienkiewicz, H. K. & Gerrard, J. H. 1963 Further results on the overall density ratios of shock waves in carbon dioxide J. Fluid Mech. 17, 267.Google Scholar
Lutz, R. W. & Kieffer, J. H. 1966 Structure of the vibrational relaxation zone of shock waves in oxygen Phys. Fluids, 9, 1638.Google Scholar
Malkmus, W. 1963 Infra-red emissivity of carbon dioxide (4·3μ band) J. Opt. Soc. Am. 53, 951.Google Scholar
Malkmus, W. 1964 Infra-red emissivity of carbon dioxide (2·7μ band) J. Opt. Soc. Am. 54, 751.Google Scholar
Schwartz, R. N. 1954 The equations governing vibrational relaxation phenomena in carbon dioxide gas. NAVORD Rep. no. 3701.Google Scholar
Simpson, C. J. S. M., Bridgeman, K. B. & Chandler, T. R. D. 1967a A shock tube study of vibrational relaxation in carbon dioxide. A.R.C. 29282, Hyp. 632.
Simpson, C. J. S. M., Bridgeman, K. B. & Chandler, T. R. D. 1967b A shock tube study of vibrational relaxation in nitrous oxide. A.R.C. 29618, Hyp. 656.
Smiley, E. F. & Winkler, E. H. 1954 Shock tube measurements of vibrational relaxation J. Chem. Phys. 22, 2018.Google Scholar
Weaner, D., Roach, J. F. & Smith, W. R. 1967 Vibrational relaxation times in carbon dioxide J. Chem. Phys. 47, 3096.Google Scholar
Weber, D., Holm, R. J. & Penner, S. S. 1952 Integrated absorption for vibrationrotation bands of carbon dioxide J. Chem. Phys. 20, 1820.Google Scholar