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Seventyseven a-type rotational transitions of Orthofluorobenzonitrile were observed and assigned in the 8 - 25 GHz frequency range. The spectrum was recorded using the high resolution microwave Fourier transform spectrometer constructed at Kiel University. For most transitions the  l4 N quadrupole hfs patterns could be fully resolved. The spectroscopic constants obtained by a fit to the observed hfs-center frequencies and to the observed hfs multiplet splittings are: A = 2940.745(12) MHz, B = 1512.699(1) MHz, C = 998.633(1) MHz (rotational constants) and Χ aa  = - 4.114( 17) MHz, X bb -  X cc = 0.383(34) MHz ( 14 N quadrupole coupling constants). The rotational spectrum of a low lying vibrational state could be also assigned.

Rotational Spectrum and 14 N-Quadrupole Coupling Constants of Orthofluorobenzonitrile, a Microwave Fouriertransform Study