Abstract
We present a grid of absolute reference frequencies based on CO2 (or N2O) lasers locked to saturation peaks of heavy molecules. Frequency differences between OsO4 peaks corresponding to adjacent CO2 laser lines from P(12) to P(22) have been measured with 1 kHz accuracy. This set includes one 192OsO4 resonance whose absolute frequency is known with the same accuracy. This absolute grid is then used to provide an absolute calibration of the ν3 band saturation spectrum of SF6. We also find a 23 kHz average frequency difference between the CO2 grid and the new OsO4 grid which we interpret tentatively as a small extrapolation error from the R to the P branch frequencies of CO2.
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