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Optical hole-burning and optically detected nuclear magnetic resonance have been used to determine the hyperfine splitting in the ground, 7 F 0 , and excited, 5 D 0 , states of Eu 3+ in the stoichiometric material KEu(WO 4 ) 2 . In addition it is shown how the use of an applied RF field during hole-burning can greatly simplify a complex hole-burning spectrum.
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Silversmith et al. (1984) studied this question.
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