The Quantum Mechanics of Collisions between Diatomic Molecules

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Abstract
The quantum mechanics of collisions between diatomic molecules is discussed. Explicit expressions for the angular transition probabilities are obtained. These expressions are in terms of a set of coefficients which are defined by the asymptotic form of the solutions of a set of coupled differential equations in one variable, the separation of the molecules. The coupled differential equations involve integrals of the intermolecular potential function, which may be of any form. A solution of the coupled differential equations by a perturbation method, which is valid in the case of low‐energy collisions, in which transitions occur rarely, is discussed.