$N_{2}O, H_{2}O$ WAVELENGTH STANDARDS IN THE $5 - 10 \mu$ RANGE, DUNHAM COEFFICIENTS OF CO

Abstract

New wavenumber standards are measured by F.T.S. in vacuum. $N_{2}O$ lines extend from about 1100 to $1350 cm^{-1}$. Their accuracy is of the order of 50 to 150 $10^{6} cm^{-1}$. The water lines are obtained with a similar accuracy on a wider range. These data measured for the first time with a high information technique are located in a spectral area where experimental wavenumber references were up to now practically absent. They should be useful for accurate calibration of diode and Fourier spectra. An extensive work on CO covering a large domain of vibration and rotation quantum numbers in the fundamental electronic state $X^{1}\Sigma$, is reported.