Abstract
Zuckerwar and Griffin [J. Acoust. Soc. Am. 68, 218–226 (1980)] have recently used a resonance tube to extend measurements of sound absorption in N2/CO2 mixtures to much lower frequency to pressure ratios (f/p) than previously obtained. Their results, when compared with previous measurements at higher CO2 concentrations, confirm that the nitrogen relaxes by a series process involving two v–v and one v–t exchange. A value of 7.5×10+4±10% s−1 atm−1 for the rate of the reaction CO2(00 °1)+N2?CO2(0310)+N2+416 cm−1 is obtained.
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