High-resolution Fourier transform absorption spectra of ozone broadened by dry air have been recorded at a number of temperatures from -63°C to 29°C. Using a multispectrum nonlinear least-squares procedure, we fit 29 of these spectra simultaneously to determine the air-broadening and shift coefficients and their temperature dependences for 450 lines in the 9-&mgr;m region; most of these belong to the nu1 band. Partial air-broadening results were obtained for 104 additional lines, and room-temperature self-broadening coefficients were also determined for most of the 554 lines measured. These results cover a wide range of rotational quantum numbers, particularly in the R branch, with J" = 55 and Ka" = 12. The variation of the retrieved broadening and shift parameters with the rotational quantum numbers has been examined; particularly interesting behavior of the broadening coefficients is noted as the value of Ka" approaches that of J". The broadening and shift coefficients compare well with previous room-temperature measurements in the nu1 and other bands. The temperature-dependence results are also consistent (within the stated uncertainties) with the few previous measurements of the temperature dependence of air- and N2-broadening coefficients in other O3 bands, but disagree with the mean value given in the HITRAN compilation. Copyright 1997Academic Press
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http://dx.doi.org/10.1006/jmsp.1996.7232 | DOI Listing |
J Chem Phys
November 2022
Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, 87-100 Toruń, Poland.
We present ab initio calculations of the collisional broadening of the R(0) pure rotational line in CO (at 115 GHz) perturbed by O. Our calculations are done in a fully quantum way by solving close-coupling quantum-scattering equations without any approximations. We also report a new, highly accurate CO-O potential energy surface on which we did the quantum-scattering calculations.
View Article and Find Full Text PDFJ Chem Phys
August 2011
Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
Frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) was employed to measure air-broadened CO(2) line shape parameters for transitions near 1.6 μm over a pressure range of 6.7-33 kPa.
View Article and Find Full Text PDFJ Mol Spectrosc
July 2001
Applied Physics Institute of RAS, 46 Uljanova Street, Nizhnii Novgorod GSP-120, 603600, Russia
For the first time the 118-GHz line of the oxygen molecule was investigated in the laboratory under a real atmosphere. The experiment was carried out by modern resonator spectroscopy methods on the laboratory air at atmospheric pressure. The shape of the line under the real atmosphere was found to fit the Van Vleck-Weisskopf profile within experimental accuracy.
View Article and Find Full Text PDFJ Mol Spectrosc
June 2000
California Institute of Technology, Jet Propulsion Laboratory, Pasadena, California, 91109
High-resolution measurements of air- and N(2)-broadened widths and pressure-induced frequency shifts of water vapor were obtained covering the spectral region between 604 and 2271 cm(-1). Over 1300 vibration-rotation transitions were measured including the (000)-(000), (010)-(010), (010)-(000), (020)-(010), and (100)-(010) vibrational bands of H(2)(16)O. Also included were measurements of H(2)(18)O and H(2)(17)O from normal water vapor samples and H(2)(18)O + N(2) observations with oxygen-18-enriched gas samples.
View Article and Find Full Text PDFJ Mol Spectrosc
February 1999
URA CNRS 259, Université des Sciences et Technologies de Lille I, Villeneuve d'Ascq Cedex, 59655, France
In this paper we report the results of both an experimental and theoretical study of the halfwidths of two transitions of water vapor. Measurements on the lines of the H216O and H218O isotopomers located at 325.1 and 203.
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