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• W2069892165 abstract "The avoided-crossing molecular-beam electric resonance method has been used to determine the leading parameters in the torsion-rotation Hamiltonian of CH3CF3, which was selected as a prototype for the case of a symmetric rotor with small (≤ 500 kHz) internal rotor splittings. Stark anticrossings have been studied for (K= ±2↔∓ 1) with J= 2−6; hyperfine anticrossings have been studied for (K= ±2↔0),(±2↔±1), and (±)↔0) with J≤2. A detailed investigation of the hyperfine case has been carried out involving selection rules, relative intensity calculations, Zeeman studies, and combination differences. Several pure rotational transitions for the lowest two torsional states have been measured between 93 and 114 GHz with a mm-wave spectrometer. The (J= 1 ← 0) transition in the ground torsional state has been measured with the molecular beam spectrometer. Stark and Zeeman studies have been carried out with conventional molecular beam techniques. It has been determined that the effective rotational constant Aeff=5502.904(3) MHz, the effective height of the threefold barrier to internal rotation Veff=1093 (11) cm−1 and the moment of inertia of the methyl top Iα=3.21(4) Å2. It has been found that the electric dipole moment μ=2.34720(13) D and the distortion dipole moment constant μD=3.220(11) μD. The magnitudes and signs of the molecular g-factors have been obtained: g∥=−0.0226(13) nm and g⊥=−0.117(1) nm. In addition, values have been determined for the B-rotational constant and several distortion constants." @default.
• W2069892165 created "2016-06-24" @default.
• W2069892165 creator A5000410636 @default.
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• W2069892165 date "1991-05-01" @default.
• W2069892165 modified "2023-10-06" @default.
• W2069892165 title "Avoided-crossing molecular-beam study of the torsion-rotation energy levels of CH3CF3" @default.
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• W2069892165 doi "https://doi.org/10.1016/0301-0104(91)85003-y" @default.
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