Abstract
An approximate approach is developed to study the interference of one- and two-quantum processes in collinear collisions of an atom and a harmonic oscillator. In deriving an explicit expression for vibrational transition probabilities, one-quantum processes are treated rigorously, while the contributions of two-quantum processes are solved in first order. The interference is found to be strong in the collision systems such as H 2 + He, especially at high collision energies. In the collisions of a light atom with a heavy diatom, the interference is found to be not important even at such high energies.
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