High resolution rotational spectrum of FCO2 radical (extension to lower frequencies)

We have subsequently extended the measurement of the FC16O2 radical to the lower frequency region, between 210 and 245 GHz with the recently developed Prague microwave spectrometer. About 60 new a-type R-branch transitions have been observed. Our present analysis enabled us to improve significantly the determination of the ground state constants: most of the parameters are now determined with higher precision up to an order of magnitude better than the previous study. In addition eight new constants could be determined or nearly determinable for the first time.