The frequency of maximum ultrasonic absorption was determined for CO2with varying small amounts of the impurities H2and D2at three different temperatures. Hydrogen was found to be 2.4 times more effective than D2in quenching the vibration of CO2at both 47deg; and 154deg;C. More unexpectedly, it was found that the rate of shift of the frequency of maximum absorption with impurity concentration is less at high temperature than at low, and this fact is shown to imply that Amdash;B collisions are 15mdash;20 less effective at the higher temperature than at the lower. The relaxing specific heat determined experimentally was found to be 5mdash;8 greater than the spectroscopic value over the entire temperature range.
展开▼
