A High-Resolution Study of CO2 Absorption Spectra between 15 and 18 Microns

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Abstract
A study has been made of the absorption due to individual lines and Q branches of CO2 bands in the 15‐to 18‐μ spectral region. The strengths and widths of absorption lines on the low‐frequency side of the v2 fundamental band and in the 02°0–0110 band of C12O216 have been measured. In the latter band the variation of line strength and width with J has been determined as well as the Coriolis interaction parameter. The strengths of five other bands of C12O216 have been determined from measurements on their Q branches, and the strengths of the v2 fundamental bands of the isotopes C13O216 and O18C12O16 have been estimated. The rotational structure of the v2 fundamental Q branch for C12O216 is partially resolved, and the band constants determined. The v2 fundamental band head of the O18C12O16 isotope is reported. The spectra were taken in 1956 after construction of the large infrared spectrometer at the Laboratory of Astrophysics and Physical Meteorology, The Johns Hopkins University. This f/6 spectrometer utilizes 3‐in. long curved slits and a 14‐ by 12‐in. grating in a Fastie‐Ebert mounting. It is demonstrated that this instrument has available an optical slit width of 0.06 cm‐1 at 17 μ.