NMR-ON on196,197m,198,198m,200mAu in Fe and Ni |
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Authors: | E. Hagn E. Zech |
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Affiliation: | (1) Physik-Department E12 der TU München, Deutschland |
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Abstract: | The zero-field hyperfine splitting frequencies of a series of Au isotopes in Fe and Ni have been determined with nuclear magnetic resonance on oriented nuclei. The results are:. For198Au(2–) in Fe the quadrupole splitting could be resolved. The results are ¦gNBHF/h|=259.48 (3) MHz and e2qp/h=–2.08(4) MHz. Our measurements show that most hyperfine splittings published on these isotopes have been incorrect. The quadrupole splitting of198AuFe disagrees in magnitudeand sign from the value reported by single-passage NMR on oriented nuclei. The following nuclear quantities are deduced: (197mAu,11/2–)=5.98(9) N; (198mAu, 12–)=5.85(9) N; (200mAu, 12–)=5.90(9) N; Q(198Au,2–)/Q(199Au, 3/2+)=1.37(3). Our measurements show further that the non-contact hyperfine field for Au in Ni is smaller than assumed previously, and that the magnetic hyperfine splitting frequency of197AuFe known from NMR is inconsistent with the magnetic hyperfine splitting frequencies of198, 199AuFe. |
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