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Pressure Broadening and Temperature Dependence of Microwave and Far Infrared Rotational Lines in OH Perturbed by N2, O2, and Ar

โœ Scribed by S. Benec'h; J. Buldyreva; M. Chrysos

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
185 KB
Volume
210
Category
Article
ISSN
0022-2852

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โœฆ Synopsis

Absorption linewidths associated with microwave transitions across -doublets and pure rotational transitions of the free hydroxyl radical OH perturbed by N 2 , O 2 , 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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