Temperature Dependence Of Air-Broadened Half Width And Pressure Shift Coefficients In The 30012 À 00001 Band Of 12C16O2

For atmospheric applications, the temperature dependence of half width and shift coefficients is required on a line-by-line basis. In this study, transitions of carbon dioxide in the 30012 _ 00001 band broadened by air were recorded using two different Fourier Transform Spectrometers (A Bomem in Ottawa and the McMath-Pierce FTS in Arizona) using dilute mixtures at temperatures between 215 K and 296 K. These data were analyzed using a multispectrum fit technique applying a Speed Dependent line shape model with line mixing. The positions and intensities of the spectral lines were constrained to conform to the appropriate quantum mechanical relationships reducing the number of parameters extracted from the spectra and reducing correlations between parameters. Pressure broadening coefficients, pressure shifts, their temperature dependencies, line mixing and speed dependence are all retrieved simultaneously in the same solution. The research performed at University of Lethbridge and the National Research Council of Canada was sponsored by the National Sciences and Engineering Research Council under the Strategic Research Program. Part of the research described in this paper was performed at the Jet Propulsion Laboratory, California Institute of Technology and the College of William and Mary, under contracts and cooperative agreements with the National Aeronautics and Space Administration.