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The molecular Zeeman effect was observed in methylene fluoride using a molecular beam maser spectrometer with the cavity in a 100-kG magnetic field. This combination of high fields and high resolution (4 kHz at 22 GHz) provides unusually high resolution for these measurements. The rotational transition 303→212 at 22 204 240 ± 2 kHz was observed in emission. The measured fluorine magnetic shielding anisotropies are 2σcc− σaa − σbb = − 335.0 ± 35 ppm and σaa − σbb = 9.0 ± 13 ppm. Accurate susceptibility anisotropies and molecular quadrupole moments were also obtained.
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Kukolich et al. (1972) studied this question.
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