Line-mixing effects in the rotational (r)Q-branches of O-16(3) perturbed by N-2 and O-2

Year: 1996

Authors: Rodriguez R., De Natale P., Di Lonardo G., Hartmann J.M.

Autors Affiliation: Laboratoire de Physique Moleculaire et Applications (CNRS UPR 136), Universite´ Paris-Sud, 91405 Orsay Cedex, France;
European Laboratory for Nonlinear Spectroscopy, Largo E. Fermi 2, I-50125 Florence, Italy and Dipartimento di Chimica Fisica e Inorganica dell’Universita`, Viale de Risorgimento 4, I-40136 Bologna, Italy

Abstract: Line-mixing effects have been studied in the (r)Q(5) to (r)Q(12) rotational subbranches of O-16(3). Far-infrared Fourier transform measurements have been made in the 30-90 cm(-1) spectral region for mixtures of ozone with N-2 and O-2 at room temperature and total pressures in the 0.5-1.3 arm range. A careful analysis of the experimental data evidence, for the first time, the effects of line interferences on absorption in the far-infrared ozone branches. Modifications with respect to additive Lorentzian line contributions are on the order of 15% at the (r)Q(Ka) peaks under atmospheric conditions. A simple model is proposed in order to account for these line-mixing effects. It successfully predicts the spectral shape in the 0.05-1.3 atm total pressure range for both O-3-O-2 and O-3-N-2 collisions. (C) 1996 Academic Press, Inc.

Journal/Review: JOURNAL OF MOLECULAR SPECTROSCOPY

Volume: 175 (2)      Pages from: 429  to: 440

More Information: The authors are very grateful to Dr. Manfred Birk for kindly providing his far-infrared FT spectra. The ECC financial support to R. Rodrigues is kindly acknowledged. Part of this study has been carried in the frame of the ECC Cooperation Program ‘‘ISORAC II,’’ Contract EVSV-CT92-0076.
KeyWords: tunable-diode-laser; Q-branch; cross-sections; ozone; band
DOI: 10.1006/jmsp.1996.0049

Citations: 13
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