MOLECULAR PARAMETERS FOR CARBON DIOXIDE BANDS IN THE 2.86 - 3.18 $\mu m$ SPECTRAL REGION
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Date
1985
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Publisher
Ohio State University
Abstract
Line positions and intensities of carbon dioxide transitions in the $3140-3500 cm^{-1}$ spectral interval have been determined from long-path, low-pressure absorption spectra recorded at $0.01 cm^{-1}$ resolution and at room temperature using the Fourier transform spectrometer in the McMath solar telescope complex at the National Solar Observatory. More than thirty bands belonging to the $^{12}C^{16}O_{2}, ^{13}C^{16}O_{2}, ^{16}O^{12}C^{18}O, ^{16}O^{13}C^{18}O$ and $^{16}C^{13}C^{17}O$ molecular species have been identified and unambiguous assignments have been made for about 2000 lines. Some of the upper vibrational levels are involved in crossing perturbations. For the more than 15 bands wholly contained in this spectral interval, absolute intensities have been derived for unblended lines using a nonlinear least squares spectral fitting technique. For these measurements, the gas pressures ranged from 1 to 10 Torr in a 24 to 384 m absorption path. The measured intensities have been analyzed to determine vibrational band intensities and F-factor coefficients for the bands.
Description
Author Institution: Department of Physics, College of William and Mary; Department of Physics, College of William and Mary; Department of Physics, NASA Langley Research Center