ROTATIONAL HYPERFINE SPECTRUM OF FLUOROFORM-d AND FLUOROFORM

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1971

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Ohio State University

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A single cavity molecular beam maser spectrometer was used to measure the hyperfine structure of the J $= 0\rightarrow 1$ rotational transition of $CF_{3} D$ and $CF_{3}H$. The resonance linewidth (F.W.H.M.) was approximately 6 kHz. Using (direct) spin-spin interactions calculated from the molecular structure, the hyperfine spectra were least squares fitted with a theoretical energy expression containing the deuteron quadrupole coupling constant, the fluorine spin-rotation interaction constant, and the hydrogen spin-rotation interaction constant. The resultant values are, for $CF_{3}D$:eqQ = 171.1 $\pm$ 2.0 kHz; deuteron spin-rotation = 3.3 $\pm$ 1.0 kHz; fluorine spin-rotation = 4.7 $\pm$ 1.0kHz. For $CF_{3}H$, the hydrogen spin-rotation constant is 24.5 $\pm$ 3.0 kHz; the fluorine spin-rotation coupling constant is 5.4 $\pm$ 1.5 kHz. The calculated center frequencies for the rotational transition (no hyperfine splittings) are: $CF_{3} D$ = 19 842 217.8 kHz; $CF_{3} H$ = 20 697 690.2 kHz.

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Support of the National Science Foundation is gratefully acknowledged. Albert C. Nelson acknowledges support from the M.I.T. Research Laboratory for Electronics. David J. Ruben is an NSF Predoctoral Fellow.
Author Institution: Department of Chemistry, Massachusetts Insitute of Technology

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