Microwave Spectrum and Molecular Structure of Vinyl Fluoride

The J=0→1 and J=1→2 transitions have been measured in the microwave spectra of the isotopic vinyl fluoride molecules C12H2C12HF, C13H2C12HF, and C12H2C13HF. Parameters obtained from the spectra are b=10636.83, 10295.26, and 10635.02 Mc, and c= 9118.18, 8859.05, and 9082.78 Mc, respectively. Moments were computed for 1134 assumed structures, and used to obtain derivatives of the moments with five structural parameters. Least squares determinations gave the following structure: r2(CC)=1.337±0.002 A, r4(CF)=1.344±0.002 A, ∠CCF=121.0±0.2°, r1(CH)=1.075±0.005 A, and r3(CH)=1.080±0.005 A. Assumed was ∠CCH=120°.