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Deviations of experimental millimetre-absorption line shapes from the usual Voigt profile are evidenced for two room-temperature rotational transitions J = 20 ← 19 (502 GHz) and J = 24 ← 23 (602 GHz) of nitrous oxide perturbed by nitrogen and oxygen. These deviations are shown to be due to collisional narrowing processes encompassed by more sophisticated speed-dependent Voigt or Galatry models. The deduced collision-regime line broadening coefficients are compared to their theoretical estimations by a semi-classical formalism. Even with a rough intermolecular potential composed of electrostatic and pair atom–atom interactions, the theoretical linewidths compare favourably with experimental results for both millimetre and infrared absorption.
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Nguyen et al. (2006) studied this question.
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