Speed Dependence of Pressure Broadening in Molecular Rotational Spectra Using a Novel Technique

Year: 1995

Authors: Buffa G., Carocci S., Dilieto A., Minguzzi P., Quochi F., Tarrini O., Tonelli M.

Autors Affiliation: UNIVERSITA’ PISA, DIPARTIMENTO FISICA, PIAZZA TORRICELLI 2,I-56126 PISA,ITALY.

Abstract: The line shape of a mm-wave rotational transition of CH3I in an excited vibrational state is observed for molecules in different velocity classes. The collisional self-broadening is measured as a function of relative speed by a novel experimental approach and clear evidence of speed dependence is observed. This result confirms the failure of an oversimplified model, which however is still widely used. We discuss it in detail, and we also show that the rotational temperature of the perturbing molecules has a
large influence on the pressure broadening coefficient.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 74 (17)      Pages from: 3356  to: 3359

KeyWords: pressure broadening; velocity dependence;
DOI: 10.1103/PhysRevLett.74.3356

Citations: 13
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