Line shape in collision-induced absorption spectra

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Abstract
Rare gas collision-induced far infrared absorption spectra have been simulated classically at three reduced temperatures, T* = 4, 2, 1. At the lowest temperature (T* = 1), bound states make a significant contribution (20 per cent). The results are compared to an asymptotic theory of the line shape. The agreement is perfect in the wings of the line, as expected, but is also surprisingly good at lower frequencies.

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