High resolution wavenumber standards for the infrared

The calibration of high resolution infrared spectra is generally more precise than accurate. This is the case even when they are recorded with Fourier transform interferometers. The present document aims at improving the accuracy of wavenumber measurements in the infrared by recommending a selection of spectral lines as wavenumber standards for absolute calibration in the range from about 4 to about 7000 cm(-1) The uncertainties of these wavenumber standards range from +/-1 x 10(-3) to +/-1 x 10(-6) cm(-1). Sources of frequency standards, on which the wavenumber determinations are based, are also given.