A theoretical description of line mixing in the Q branch of an infrared rotation-vibration band is obtained in the weak coupling approximation. The description is applied to the case of the nu(2) band of CO(2) near 667 cm(-1). Theoretical absorption profiles are given for selected spectral regions corresponding to representative values of the pressure. A comparison is made between the weak coupling results and the results of a forthcoming dynamical calculation of the absorption band shape.
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R. L. Armstrong (1982) studied this question.