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The Schwartz—Slawsky—Herzfeld (SSH) theory of vibrational relaxation times assumes that the most effective relative kinetic energy for causing a vibrational transition is much greater than the quantum of energy transferred. For many actual cases, this assumption is not a good one. However, it appears that this approximation can be eliminated with little change in the resulting equations. The force law for N2, determined with the modified equations from the experimental data on relaxation times, does not differ appreciably from previous results.
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Vanderslice et al. (1962) studied this question.
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