CO{sub 2} bands in the 3350 - 3700 cm{sup {minus}1} spectral region: Ro-vibrational constants and absolute intensities

Spectroscopic constants and absolute intensities from more than 2150 transitions belonging to 52 bands of 7 isotopic species of carbon dioxide have been determined using a multispectrum nonlinear least-squares fitting technique. The spectral data (0.01 cm{sup -1} resolution) were obtained at room temperature and low pressure (<10 Torr) using the McMath-Pierce Fourier transform spectrometer of the National Solar Observatory on Kitt Peak, Arizona. A natural sample of carbon dioxide with absorption path lengths between 24 and 385m were used in recording the spectra. The first measurements have been made of the theoretically predicted 2v{sub 2}{sup 2} 2+v{sub 3} {open_quotes}forbidden{close_quotes} band of {sup 12}CO{sub 2}. Two bands which have not been predicted so far, one belonging to {sup 13}CO{sub 2} and the other to {sup 13}C{sup 16}O{sup 18}O, have been identified. The measured line intensities obtained for each band have been analyzed to determine the vibrational band intensity and F-factor coefficients. The results are compared to the values used to calculate the intensities in the 1992 HITRAN database. Simulations illustrating the differences in spectra predicted with the new lines and the HITRAN 1992 lines are presented along with comparisons to stratospheric and laboratory spectra.