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Air-broadening parameters in the ν3 band of NO2 using a multispectrum fitting technique |
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| Authors: | D. Chris Benner L.R. Brown V. Malathy Devi R.A. Toth |
| Affiliation: | a The College of William and Mary, Box 8795, Williamsburg, VA 23187-8795, USA b Pacific Northwest National Laboratory, MS K8-88, Battelle Boulevard, P.O. Box 999, Richland, WA 99352, USA c Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA d Atmospheric Sciences, NASA Langley Research Center, MS 401A, Hampton, VA 23681-2199, USA |
| Abstract: | Air-broadened linewidths, pressure-induced shift coefficients and their temperature dependences were retrieved for over 1000 transitions in the ν3 band of 14N16O2 at 6 μm. In addition, precise line center positions and relative intensities were also determined. The results were obtained by fitting simultaneously 27 spectra recorded at high resolution (0.002-0.006 cm−1) with two Fourier transform spectrometers and gas sample temperatures ranging from 206 to 298 K. It was necessary to modify the multispectrum fitting software to accommodate constraints on the retrieved parameters of closely spaced spin-split doublets in order to successfully determine their broadening and shift parameters. The variations of the widths, shifts and their temperature dependences with the quantum numbers were investigated. Subsets of the observed linewidths were reproduced to within 3% using an empirical smoothing function. |
| Keywords: | NO2 Air broadening Pressure shifts Temperature dependence Infrared ν3 |
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