Sound Absorption and Velocity Measurements in Oxygen

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Abstract
The tube method has been used to measure sound absorption and velocity in pure oxygen at 23.5°, 208.7°, and 301.3°C. At the elevated temperatures, the absorption was in excess of the classical value. This was attributed to thermal relaxation of the vibrational energy. At 208.7° and 301.3°C, the peak value of the relaxation-absorption curve is estimated to fall at 100 ±4 and 175 ±13 cps/atm, respectively. These values correspond to relaxation times of 1.71 × 10−3 and 1.01 × 10−3 sec and are considerably longer than would be expected by interpolation from previous data at higher and lower temperatures.

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