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A treatment, within the framework of the sudden perturbation approximation of time-dependent perturbation theory, of the pressure broadening of rotational transitions is presented. The Lorentz line-shape expression is derived in the limit of low pressures, and explicit expressions for the frequency-shift and linewidth parameters are given in terms of the intermolecular potential. Detailed comparison to other perturbation theories of line broadening is made.
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Trindle et al. (1967) studied this question.
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