			10min:

THE MICROWAVE SPECTRUM OF THE FLUOROBENZENE-NEON DIMER.

ROBB J. WILSON, ROBERT L. KUCZKOWSKI, Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, U.S.A..

The microwave spectra of three isotopomers of fluorobenzene-neon (normal, ²²Ne and d -5) have been observed using a Fourier transform spectrometer. Twenty-two transitions were fit to eight constants. The dimer has a stacked structure with the neon over the fluorobenzene ring in the symmetry plane. The center of mass distance (R_cm) is 3.44(1) Å, with the neon sitting between the center of mass and the center of the ring. The rotational constants have been determined as A = 1926.421(2) MHz, B = 1645.236(3) MHz, and C = 1279.734(1) MHz. The electric dipole moment was measured to be |µ_a| = 1.15(3) D, |µ_b| = 1.12(3) D, |µ_t| = 1.61(5) D.