High resolution (0.007-cm-1) spectral measurements of a hot (800 K) CO2 sample consisting of 88% 13C16O2, 11% 13C16O18O, and 1% various other isotopes were made in the 4.3-µm region using the Air Force Geophysics Laboratory Fourier transform spectrometer. Vibration-rotation constants which predict line positions to better than 0.001 cm-1 are presented for several bands of these two isotopes.
Mark P. Esplin, Ronald J. Huppi, and George A. Vanasse, "Spectral measurements of high temperature 13C16O2 and 13C16O18O in the 4.3-µm region," Appl. Opt. 21, 1681-1685 (1982)