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Thermal piston model for the optoacoustic effect: Sound generation in an optically thick gas
1.L. B. Kreuzer, in Optoacoustic Spectroscopy and Detection, edited by Y. H. Pao (Academic, New York, 1977), and references therein. Chap. 1.
2.A. Karbach and P. Hess, J. Chem. Phys. 84, 2945 (1986).
3.A. C. Tam, in Ultrasensitive Laser Spectroscopy, edited by D. S. Kliger (Academic, New York, 1983), Chap. 1.
4.P. M. Morse and K. U. Ingard, Theoretical Acoustics (McGraw‐Hill, New York, 1968).
5.Note that a similar approach has been used by A. Rosencwaig and A. Gersho, J. Appl. Phys. 47, 64 (1976) in describing sound production at solid‐gas interfaces. The factor of appearing in the expression for the piston volume although arbitrary, is justified in Sec. IV of this reference.
6.M. Necati Ozisik, Heat Conduction (Wiley, New York, 1980), pp. 221–223.
7.F. Oberhettinger, Fourier Expansions (Academic, New York, 1973), formula 1.53.
8.The Spectrometer Measurements by R. T. Legemant and E. A. Jones, J. Chem. Phys. 19, 534 (1951) give an absorption coefficient for at 9.6 μ of less than at 10.6 μ it is Our measurements with the line of the laser at 10.6 μ give a value of which we believe is a more accurate value since it is measured exactly at the wavelength used in the experiment without averaging over a large bandwidth.
9.The thermal conductivity of was calculated from the viscosity measurements of J. Kestin, H. E. Khalifa, S. T. Ro, and W. A. Wakeham, Physica 88, 242 (1977) using equation (2–49) in N. V. Tsederberg, Thermal Conduction of Gases and Liquids (MIT, Boston, 1970) for gas mixtures.
10.The phase lag arising from the finite relaxation time of should be negligible since the vibrational relaxation time at 1 atm is less than 1 μs. See T. Cottrell and J. McCoubrey, Molecular Energy Transfer in Gases (Butter‐worth, London, 1961).
11.S. Didascalou, R. Stewart, and G. J. Diebold, Opt. Commun. 58, 103 (1986).
12.A. C. Tam and Y. H. Wong, Appl. Phys. Lett. 36, 472 (1980).
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