Abstract
Litovitz and Herzfeld have given reasons for the belief that the exchange of internal vibrational and of external energy in Kneser liquids is determined by isolated binary encounters. Fixman and Zwanzig have raised objections against their calculations, Fixman by introducing Brownian motion type forces, Zwanzig by emphasizing the interference between subsequent events. The present paper tries to show that these objections are not justified in most cases.

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