Absolute intensities for 430 transitions belonging to eleven rotation-vibration bands of ¹²C¹⁶O₂,¹³C¹⁶O₂ and¹⁶O¹²C¹⁸O in the 3140–3410-cm^-1 spectral region have been determined by analyzing spectra recorded at 0.01-cm^-1 resolution with the Fourier transform spectrometer in the McMath solar telescope complex at the National Solar Observatory on Kitt Peak. The data were recorded at room temperature and low pressures (<10 Torr) using a natural sample of carbon dioxide. Intensities were derived using a nonlinear least-squares spectral fitting procedure, and the values obtained for each band have been analyzed to determine the vibrational band intensity and nonrigid rotor coefficients. An alternative mathematical formulation is shown in the case of bands for which the Coriolis effect is large and the Q-branch line intensities were not determinate either because they were severely blended or absent from the spectra. Comparisons are made between the results obtained in this study and other published values.

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