Scientific Results

Far-Infrared self-broadening in methylcyanide: absorber-perturber resonance

Year: 1992

Authors: Buffa G., Tarrini O., De Natale P., Inguscio M., Pavone FS., Prevedelli M., Evenson K.M., Zink L.R., Schwaab G.W.

Autors Affiliation: Dipartimento di Fisica dell’Universit√†, Piazza Torricelli 2, 56126 Pisa, Italy;
Dipartimento di Fisica, Università di Firenze and European Laboratory for Nonlinear Spectroscopy (LENS) Largo E. Fermi 2, 50125 Firenze, Italy;
National Institute for Standards and Technology, Boulder, CO 80303 USA;
Max Planck Institut fur Radioastronomie, W-5300 Bonn, Germany

Abstract: Using tunable far-infrared spectrometers with high-frequency stability and accuracy, we have measured the self-pressure broadening and shift of CH3CN. We obtained clear evidence of absorber-perturber resonance effects on the collisional line shape. This tests the theoretical model and its possible improvements and also allows us to make broadening and shift predictions for a large class of molecules. Moreover, the resonance effect produces a theoretical temperature dependence of self-broadening that is very different from what is commonly assumed.


Volume: 45 (9)      Pages from: 6443  to: 6450

KeyWords: rotational lines; spectrum; shift
DOI: 10.1103/PhysRevA.45.6443

Citations: 22
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