Long standing problems in the comparison of very accurate hyperfine-shift measurements to theory were partly overcome by precise measurements on few-electron highly charged ions. Still the agreement between theory and experiment is unsatisfactory. In this Letter, we present a radically new way of precisely measuring hyperfine shifts, and demonstrate its effectiveness in the case of the hyperfin...

The hyperfine anomalies in Gd and Nd have been extracted from the experimental hyperfine structure constants using a new method. In addition to the values of the hyperfine anomaly new improved values of the nuclear magnetic dipole moment ratios are derived. PACS Numbers: 21.10.Ky, 31.30.Gs, 32.10.Fn

Hyperfine coupling in non-rigid molecular systems with several equivalent nuclei is very interesting because of the averaging due to the large amplitude motion(s). For instance, in the cases of the non-rigid (D O) and (C D ) dimers, the molecule behaves as if quadrupole coupling was identical for all four deuterium atoms. This result, only valid for nondegenerate tunneling levels, disagrees ind...

We study the hyperfine interaction between the nuclear spins and the electrons in a HgTe quantum well, which is the prime experimentally realized example of a two-dimensional topological insulator. The hyperfine interaction is a naturally present, internal source of broken time-reversal symmetry from the point of view of the electrons. The HgTe quantum well is described by the so-called Bernevi...

The SU(3) and hyperfine mass splittings of mesons containing a single heavy quark are computed to one-loop order in chiral perturbation theory with heavy quark spin symmetry. Electromagnetic contributions of order αem are included. The observed values of the mass splittings are consistent with the one-loop chiral perturbation theory calculation. The d− u hyperfine splitting (D∗+ −D)− (D∗0 −D) i...

Our ab initio calculations of the hyperfine parameters for negatively charged vacancy-hydrogen and nitrogen-vacancy-hydrogen complexes in diamond compare static defect models and models which account for the quantum tunneling behavior of hydrogen. The static models give rise to hyperfine splittings that are inconsistent with the experimental electron paramagnetic resonance data. In contrast, th...

We have measured hyperfine structure in the first-excited P state (D lines) of all the naturally-occurring alkali atoms. We use high-resolution laser spectroscopy to resolve hyperfine transitions, and measure intervals by locking the frequency shift produced by an acousto-optic modulator to the difference between two transitions. In most cases, the hyperfine coupling constants derived from our ...

J. S. Grossman, L. A. Orozco, M. R. Pearson, J. E. Simsarian,* G. D. Sprouse, and W. Z. Zhao Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800 (Received 5 April 1999) We have measured the hyperfine structure of the 7P1 2 level for 2082212Fr to a precision of 300 ppm. These measurements along with previous ground state hyperfine structure measure...

High-precision experiments on the ground state hyperfine splitting in highly charged ions performed at the GSI facilities and at the EBITs (see, e.g., Refs. [1, 2, 3]) have triggered intensive theoretical investigations of this effect. The error bars of the theoretical hyperfine splitting values are mainly determined by the nuclear magnetization distribution correction, the so-called Bohr-Weiss...

We consider three-loop radiative-recoil corrections to hyperfine splitting in muonium generated by the diagrams with electron and muon vacuum polarizations. We calculate single-logarithmic and nonlogarithmic contributions of order alpha;{3}(m/M)E_{F} generated by gauge invariant sets of diagrams with electron and muon polarization insertions in the electron and muon factors. Combining these cor...