MOLECULAR PARAMETERS FOR CARBON DIOXIDE BANDS IN THE $1820-2050 cm^{-1}$ SPECTRAL REGION
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Date
1989
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Publisher
Ohio State University
Abstract
Line positions and intensities of carbon dioxide transitions between 1820 and $2050 cm^{-1}$ have been determined from long-path, low-pressure, room-temperature spectra recorded with $0.01 cm^{-1}$ resolution using the Fourier transform spectrometer in the McMath solar telescope facility on Kitt Peak. Several vibration-rotation 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 $^{16}o^{13}C^{17}o$ molecules were identified and unambiguous assignments made for more than 1200 lines. Absolute intensities were derived for more than 1000 unblended lines belonging to 12 bands completely contained in this spectral region using a nonlinear least-squares spectral fitting technique. For each band, the accurately measured positions were fitted to determine the band center and effective upper- and lower-state rotational constants while the absolute intensities were fitted to determine the vibrational band intensity and F-factor coefficients. For this analysis, a $CO_{2}$ sample enriched in $^{13}C$- and $^{18}o-$ was used in absorption path lengths of 48, 144 and 385 m with sample pressures of -1 Torr. The results will be presented and comparison made to values available in the literature.
Description
Author Institution: Department of Physics, College of William and Mary; Atmospheric Sciences Division, NASA Langley Research Center