A theoretical and experimental study of the infrared line shape from resonance to the wings for uncoupled lines

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Abstract
In a theoretical approach of the infrared line shape in the gas phase, each of the following effects is carefully examined: initial orientational correlations between colliding molecules, lines coupling, and finite duration of collisions. For the case where only the last effect is significant, a model is proposed which is convenient for calculating involved molecular systems. Application to the CO2‐broadened HCl lines leads to a new and clear understanding of the pressure dependence of the infrared line shape, in the resonance regions as well as in the troughs between lines. In particular, a consistent description of the observed super‐Lorentzian behavior in these troughs is obtained.