Line parameters including temperature dependences of self- and air-broadened line shapes of (CO2)-C-12-O-16: 1.6-mu m region

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Journal of Quantitative Spectroscopy & Radiative Transfer

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Pressure-broadened line shapes in the 300134 < - 00001 (nu(1)+4 nu(0)(2)+nu(3)) band of (CO2)-C-12-O-16 at 6228 cm(-1) are reanalyzed using new spectra recorded with sample temperatures down to 170 K. High resolution, high signal-to-noise (S/N) laboratory measurements of line shapes (Lorentz air- and self-broadened half-width coefficients, pressure-shift coefficients and off diagonal relaxation matrix element coefficients) as a function of gas sample temperatures for various pressures and volume mixing ratios are presented. The spectra were recorded using two different Fourier transform spectrometers (FTS): (1) the McMath-Pierce located at the National Solar Observatory on Kitt Peak, Arizona (and reported in Devi et al., J Mol Spectrosc 2007;245:52-80) and, (2) the Bruker IFS-125HR FTS at the Jet Propulsion Laboratory in Pasadena, California. The 19 spectra taken at Kitt Peak were all recorded near room temperature while the 27 Bruker spectra were acquired both at room temperature and colder temperatures (170-296 K). Various spectral resolutions (0.004-0.011 cm(-1)), absorption path lengths (2.46-121 m) and CO2 samples (natural and C-12-enriched) were included in the dataset. To maximize the accuracies of the various retrieved line parameters, a multispectrum nonlinear least squares spectrum fitting software program was used to adjust the ro-vibrational constants (G,B,D etc.) and intensity parameters (including Herman-Wallis terms) instead of directly measuring the individual line positions and intensities. To minimize systematic residuals, line mixing (via off-diagonal relaxation matrix elements) and quadratic speed dependence parameters were included in the analysis. Contributions from other weakly absorbing bands: the 300134 < - 00001 and 300124 <- 00001 bands of (CO2)-C-13-O-16, the 30013 < - 00001 band of (COO)-C-12-O-16-O-18, hot bands 311134 < - 01101 and 322124 < - 02201 Or (CO2)-C-12-O-16, as well as the 400134 < - 10001 and the 400144 < - 10002 bands of (CO2)-C-12-O-16, present within the fitted interval were also measured. Results from previous works and new calculations are compared to present measurements, where appropriate. (C) 2015 Elsevier Ltd. All rights reserved.



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