The rotational spectrum, structure and dynamics of a benzene dimer

Abstract
The low J (2 to 7) rotational spectrum of a symmetric‐top benzene dimer has been obtained with a Balle/Flygare Fourier transform microwave spectrometer. Each transition is a symmetrical quartet with two J‐ and K‐dependent tunneling splittings of 30 to 400 kHz. Rotational constants B̄, DJ, and DJK were determined to be 427.76(2) MHz, 7.2(3) kHz, and 0.869(5) MHz. The dimer is T‐shaped with a benzene c.m. to c.m. distance of 4.96 Å.

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