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The use of light emission from sulphur dioxide to measure vibrational relaxation times in shock-heated gases is described. Results for nitrogen relaxed by N2, SO2, O2, He, D2, Ar and Kr as collision partners at 2500° K are reported. All except SO2 and O2 fit both Millikan and White's correlation and Schwartz, Slawsky and Herzfeld's theory: energy transfer from internal modes of H2 and D2 and from the rotational mode of N2 do not contribute significantly to the rate of vibrational relaxation.
Colgan et al. (Sun,) studied this question.