Abstract
Using a pulsed molecular beam FT microwave spectrometer the pure rotational spectrum of the 1,2-difluorobenzene dimer has been recorded in the frequency range from 3 to 26.5 GHz. Only c-type transitions were found. Each line is split into two tunneling components separated by 110 kHz. The center frequencies were fitted to yield the rotational constants A=671.874764(55) MHz, B=498.955865(79) MHz, and C=456.933056(98) MHz. Moreover, all quartic and some sextic centrifugal distortion constants (Watson’s S reduction) were determined. In the complex the ring planes are assumed to be parallel with a distance of 3.45 Å between them. Both rings are rotated by an angle of 130.3° against each other.
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