Abstract
Ultrasonic absorption has been measured in mixtures of H2O with 15%, 35%, and 55% Ar and N2 at 500 °K. The classical absorption was subtracted from the measured values and the remainder was analyzed in terms of parallel vibrational and rotational relaxation. By extrapolating to 100% H2O, the rate of self deactivation was found to be (2.0 ± 0.4) × 108 sec−1 atm−1 for vibration and (8.3 ± 0.5) × 108 sec−1 atm−1 for rotation. Extrapolation to 0% H2O yields a rate of (4.0 ± 2.0) × 106 sec−1 atm−1 for H2O vibrational deexcitation by N2 or Ar. The isothermal–isometric rotational relaxation time for H2O in one atm of Ar was found to be (1.2 ± 0.2) × 10−9 sec. These results at 500 °K are compared with other work at higher and lower temperatures in order to form a basis for extrapolating to room temperature. Subject Classification: [43]35.20, [43]35.35.
Published Version
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