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.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Reference22 articles.
1. Weber, D. , Holm, R. J. & Penner, S. S. 1952 Integrated absorption for vibrationrotation bands of carbon dioxide J. Chem. Phys. 20,1820.
2. 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.
3. Lutz, R. W. & Kieffer, J. H. 1966 Structure of the vibrational relaxation zone of shock waves in oxygen Phys. Fluids,9,1638.
4. Smiley, E. F. & Winkler, E. H. 1954 Shock tube measurements of vibrational relaxation J. Chem. Phys. 22,2018.
5. 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.
Cited by
13 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献