By Karl F. Herzfeld
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Additional info for Absorption and Dispersion of Ultrasonic Waves
95. As the main relaxation time in most Kneser liquids has not been measured directly, one calculates a relaxation time which is necessary to give the measured low frequency absorption. This is only true if the extra absorption is due to slow energy exchange between vibrational and external degrees of freedom, and if the whole vibrational energy (know from spectroscopic or thermal data) has one dominant relaxation time. It is done for Kneser liquids for which the relaxation time in the gaseous state has been measured directly.
26, 566 (1954).
The 7 C. Truesdell, / . Rational Mech. Anal. 2, 643 (1953). Truesdell distinguishes good conductors of heat (molten metals, liquid helium II), moderate conductors (gases), and poor conductors (most liquids) by the magnitude of the Eucken number. 8 9 W. T. Richards and J. A. Reid, / . Chem. Phys. 2, 193 (1934). F. Gutowski, Ph. D. , Washington, / . Acoust. Soc. Am. 28, 478 (1956). , 1956; 10 A. Busala, D. Sette, and J. C. Hubbard, / . Chem. Phys. 23, 787 (1955). 11 T. A. Litovitz, T. Lyon, and L.