A nonlinear least-squares fitting procedure has been used to derive absolute intensities for lines in the P, R, and Q branches of the (1110)II←0000 band of 12C16O2 (band center = 1932 cm-1) from long-path 0.01-cm-1 resolution laboratory spectra. The spectral data were recorded at room temperature and low pressure (<10 Torr) with the Fourier transform spectrometer in the McMath solar telescope complex at Kitt Peak National Observatory. The observed line intensities were analyzed to derive the vibrational band intensity and F-factor coefficients. To obtain a good fit to the data, it was necessary to include terms in the expression for the F factor, which account for Coriolis-type and Fermi-type interactions and centrifugal distortion effects.
Curtis P. Rinsland, D. Chris Benner, Donald J. Richardson, and R. A. Toth, "Absolute intensity measurements of the (1110)II←0000 band of 12C16O2 at 5.2 µm," Appl. Opt. 22, 3805-3809 (1983)