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A reduction with magnetic field of the ground-state g factor in the trigonal plane in single crystals of cerous magnesium nitrate has been measured by EPR at 4.2^∘{}K with frequencies between 35 and 125 GHz. A value of g_⊥=1.840±0.002 is determined at 35 GHz. Theoretical predictions employing the known temperature-independent component of the magnetic susceptibility and energy of the first excited state are in good agreement with the measurements. In addition, the g factor of the free radical of diluted 2,2-diphenyl-1-picryl-hydrazyl (DPPH) was found to be field-independent (to an accuracy of 0.1%) for fields as high as 45 kG.
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Williamson et al. (1969) studied this question.
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