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Resonant enhancement of the magnetic x-ray scattering cross section in UAs has been investigated by tuning the incident x-ray energy through the uranium MIV and MV absorption edges. At the MIV edge the intensity for the (0,0,(5/2) magnetic reflection is enhanced by 10⁷ relative to the nonresonant component far above the edge, and is a remarkable 1% of the intensity of the (0,0,2) charge peak. At the MV edge the enhancement is 10⁵. The dramatic enhancement at M edges has been predicted by Hannon et al., and arises from strong electric multipole transitions between atomic core states and the exchange-split Fermi edge states.
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Isaacs et al. (1989) studied this question.
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