The probability of vibrational energy exchange in a molecular collision can be calculated using (1) a wave‐mechanical treatment using the method of ``distorted waves,'' (2) a semiclassical time‐dependent perturbation procedure in which the perturbation energy is obtained as a function of time from the classical collision trajectory, and (3) a purely classical calculation of the energy transferred to a classical vibrator. These methods are reviewed, related, and compared.

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