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The model of exact trajectories involved in a semiclassical computation of (vib)rotational linewidths and shifts is extended to the case of asymmetric top colliders. General expressions for the second-order contributions to the scattering matrix are given which define the pressure broadening and shift of the line. This theoretical approach is tested on the particular case of the infrared ν₇ band linewidths of C₂H₄ broadened by N₂ which is frequently required for atmospheric applications. The computed linewidths compare favorably with available experimental data.
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Buldyreva et al. (2008) studied this question.
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