A frequency-dependent thermal conductivity, associated with the thermal relaxation of the vibrational degrees of freedom in a polyatomic gas, has been observed in a study of the density fluctuation spectrum of dilute SF₆. Spectra calculated from the two-temperature hydrodynamic theory of Morse, Sugawara, and Yip, which explicitly accounts for a frequency dependent thermal conductivity, are shown to agree well with the measured spectra.
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Clark et al. (1972) studied this question.
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