Abstract
This chapter considers clusters of closely-spaced transitions whose shapes, being affected by ‘collisional line-mixing’, cannot be accurately modeled with ‘isolated lines’ models. The main features of the line-mixing process and some approximations in specific cases (e.g. the first order treatment) are first discussed. Then, various models are presented, ranging from simple empirical ones that can be applied to extremely complex spectra to fully physically based approaches only tractable for simple molecular systems. Examples of comparisons between the predictions of these theoretical approaches and measured spectra are given and discussed. Advices for practical calculations and for the determination of line-mixing parameters from experiments are also given. Finally, we review the data recently proposed for the description of line mixing in absorption spectra calculations.
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