15min:

CHARLES E. MILLER, Department of Chemistry, Haverford College, Haverford, PA 19041 USA; LINDA R. BROWN, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA.

High-resolution near infrared 4000 - 9000 cm^-1 spectra of carbon dioxide have been recorded using the McMath-Pierce Fourier transform spectrometer at the Kitt Peak National Solar Observatory. Spectroscopic constants have been determined for 53 different vibrational states of the ¹⁶O¹²C¹⁶O isotopologue, including 8 vibrational states for which laboratory spectra have not previously been reported. Calibration using the 2-0 band of CO near 4200 cm^-1 and the ( ₁ + ₃) combination band of C₂H₂ near 6500 cm^-1 provides absolute line position accuracies of 2×10^-5 cm^-1 (RMS) for strong, isolated transitions throughout the observed range. Fits with RMS errors less than 3.8×10^-5 cm^-1 have been obtained for the 20013 00001, 20012 00001, and 20011 00001 bands and RMS errors less than 6×10^-5 cm^-1 have been obtained for the 30014 00001, 30013 00001, 30012 00001, and 00031 00001 bands. The new line list satisfies the line position accuracies required for the next generation of CO₂ remote sensing instruments, improves the capability of solar-viewing spectrometers to retrieve precise column CO₂ measurements, and provides a secondary frequency standard in the NIR.