Absolute line intensities in CO_2 bands near 48 μm

Absolute intensities have been determined for over 700 unblended lines in twenty bands of 12C16O2, 13C16O2, 16O12C18O, and 16O12C17O in the 4.8-μm spectral region. The spectral data used in the analysis were recorded at room temperature and low pressure (<10 Torr) with the Fourier transform interferometer in the McMath solar telescope complex of the National Solar Observatory. A natural sample of ultrahigh-purity carbon dioxide was used in the experiment. For each band, the measured line intensities have been fitted to derive the vibrational band intensity and coefficients of the F factor. These derived quantities are compared to values assumed in calculation of the 1982 Air Force Geophysics Laboratory line parameters compilation.