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Abstract
Absorption linewidths associated with microwave transitions across Λ-doublets and pure rotational transitions of the free hydroxyl radical OH perturbed by N2, O2, and Ar are computed for temperatures ranging from 194 to 300 K within the framework of the Robert–Bonamy semiclassical formalism using exact trajectories. The calculation is done for the Hund's coupling case (a) which is expected to be a good approximation for the low rotational quantum numbers so far experimentally studied. As intermolecular potential, the usual sum of electrostatic and atom–atom interactions is taken. Unlike previous theoretical predictions, our computed values are found to be in good agreement with measurements.
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