Quadrupole splitting coupling constant

Summary of EPR -Values, Fg-Hyperfine Coupling Constants, Isomer Shifts, and Quadrupole Splittings for Some Representative [Fg3S4] Clusters... 

The experimentally observed quadrupole splitting AEq for Fe in inorganic compounds, metals, and solids reaches from 0 to more than 6 mm s [30, 32]. The range of AEq for other Mossbauer isotopes may be completely different because of the different nuclear quadrupole moment Q of the respective Mossbauer nucleus, and also because the EFG values may be intrinsically different due to markedly different radial distributions of the atomic orbitals (vide infra). As Q is constant for a given isotope, variations in the quadrupole coupling constants eQV can only arise from... 

Chemical information from hafnium Mossbauer spectroscopy can primarily be deduced from the quadrupole-splitting parameter. In Table 7.4, we have listed the quadrupole coupling constants eQV for some hafnium compounds. Schafer et al. 

Quadrupole coupling, isomer shift Quadrupole tensor, nuclear Zeeman splitting, g values, coupling constants, relaxation times... 

Whereas the Mossbauer spectra at 77 K of CsM13% (M = V, Mn) can be fitted assuming quadrupole splitting at a single metal site, two sites (a/b =2/1), with coupling constants of opposite sign, must be assumed when M = Cr. In the a and b sites the 12T atoms are in asymmetric and symmetric bridging positions respectively, consistent with axially distorted octahedra. The a to jS phase transition (Table 36) is confirmed from X-ray powder diffraction, but at 165 5 K.278... 

The 31P nucleus has a natural abundance of 100% and a spin number of 1/2 (therefore no electrical quadrupole moment). The multiplicity rules for proton-phosphorus splitting are the same as those for proton-proton splitting. The coupling constants are large (/H—p 200-700Hz, and /Hc p is 0.5-20 Hz) (Appendix F) and are observable through at least four bonds. The 31P nucleus can be observed at the appropriate frequency and magnetic field (Chapter 6). 

Nuclear hyperfine splittings in the rotational spectra of dimers have been observed in the molecular beam electric resonance experiments and the Fourier transform microwave experiments. In most cases, the coupling constants are interpreted with the simplified expression given in Eqn. (6) for axially symmetric molecules in the K=0 rotational manifold. Thus both the nuclear quadrupole coupling term and the... 

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