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- W1987928740 abstract "The Mössbauer effect allows the precise determination of energy splittings and energy shifts of nuclear states, caused by the electromagnetic interaction with surrounding electrons. They are: the isomer shift, related to the charge state of the resonant atom; the quadrupole coupling, mirroring the symmetry of the bond structure; the magnetic splitting, giving information on the spin and orbital momenta of open electron shells. In the light actinides, the most useful candidate for Mössbauer measurements is the 60 keV radiation from237Np excited in theα-decay of 241Am. Two examples are presented to demonstrate the power of Mössbauer spectroscopy for the study of the 5f-electron structure. The first relates to high pressure measurements on antiferromagnetic NpAs. They show that hybridization with the ligand p electrons causes a departure from fully localized f-electron configuration and that under reduced volume the (4↑, 4↓) spin structure present at higher temperatures under ambient conditions will be retained at low temperatures. The second example is a comparison of Mössbauer parameters of Np(VII) compounds with those of Np(VI) neptunyls, indicating that in the heptavalent compounds the bond structure is neptunyl-like." @default.
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- W1987928740 date "1989-07-01" @default.
- W1987928740 modified "2023-10-16" @default.
- W1987928740 title "Mössbauer spectroscopy on actinides" @default.
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- W1987928740 doi "https://doi.org/10.1016/0022-3115(89)90170-0" @default.
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