Abstract

The absolute accuracies of infrared calibration standards for line positions have been investigated using a 0.0056-cm−1-resolution (unapodized) Fourier-transform spectrum recorded from 550 to 5000 cm−1. The spectrum has been obtained using a multicell arrangement containing the various molecular species. Detailed comparisons reveal that standards for CO2, CH4, and N2O obtained from laser research and NH3 from Fourier-transform spectrometer research are consistent within the accuracies of the present data (±0.0001 cm−1). However, certain N2O, H2O, and CO values in the 1100- to 2300-cm−1 region are systematically high by 0.0001 to 0.0004 cm−1. Correction factors for the H2O and CO standards are obtained to bring these into agreement with the laser values. In addition, corrected values for the 2ν2 and ν1 bands of N2O at 9 μm are reported.

© 1985 Optical Society of America

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