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A change of the intensity of resonance fluorescence may take place when Zeeman states of the excited level have the same energy. The fields at which these `level crossings' occur in 199 Hg and 201 Hg have been measured. Combined with recent determinations of the hyperfine coupling constants, the results yield values for g J of the 3 P 1 states: g J (199)=1.48634±0.00005, g J (201)=1.48606±0.00015.
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John N. Dodd (1961) studied this question.
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