Zero-field paramagnetic resonance of trivalent gadolinium in several lanthanide tris(ethylsulfate) nonahydrates and nonadeuterates: Determination of crystal-field and hyperfine-structure parameters

1975 ◽  
Vol 11 (11) ◽  
pp. 4623-4638 ◽  
Author(s):  
E. R. Bernstein ◽  
G. M. Dobbs
Keyword(s):  
Hyperfine Structure ◽  
Crystal Field ◽  
Zero Field ◽  
Structure Parameters ◽  
Paramagnetic Resonance

Theoretical Studies of the Optical Spectra and EPR Parameters of CaWO4: Sm3+ Crystal

2004 ◽  
Vol 59 (3) ◽  
pp. 113-115 ◽  
Author(s):  
Hui-Ning Donga ◽  
Hui-Ning Donga ◽  
Hui-Ning Donga ◽  
Hong Tanga ◽  
Xiao-Bing Luoc ◽  
...  
Keyword(s):  
Hyperfine Structure ◽  
Crystal Field ◽  
Optical Spectra ◽  
Irreducible Representations ◽  
Tetragonal Symmetry ◽  
Theoretical Studies ◽  
Structure Parameters ◽  
Spin Orbit Coupling ◽  
Epr Parameters ◽  
Theoretical Results

The optical spectra and EPR parameters (g factors g||, g⊥ and hyperfine structure parameters A||,A⊥ of 147Sm and 149Sm) of Sm3+ in CaWO4 crystal are calculated from the second-order perturbationformulas of EPR parameters for a 4f5 ion in tetragonal symmetry. In these formulas, the Jmixingamong the 6HJ (J = 5/2, 7/2 and 9/2) states via crystal-field interactions, the mixtures amongthe states with the same J value via spin-orbit coupling interaction and the interactions between thelowest Kramers doublet Γ γ and the same irreducible representations in the other 11 Kramers doubletsΓx via the crystal-field and orbital angular momentum (or hyperfine structure) are considered.The theoretical results agree reasonably with the observed values.

Temperature dependence of the crystal-field splittings and hyperfine structure in Eu2+:CaWO4 and evidence for nuclear quadrupole interactions

1969 ◽  
Vol 47 (14) ◽  
pp. 1505-1515 ◽  
Author(s):  
J. S. M. Harvey ◽  
H. Kiefte
Keyword(s):  
Temperature Dependence ◽  
Hyperfine Structure ◽  
Crystal Field ◽  
Hyperfine Coupling Constant ◽  
Rare Earth Ions ◽  
Fourth Power ◽  
Crystalline Electric Field ◽  
Paramagnetic Resonance ◽  
Nuclear Quadrupole ◽  
Crystal Field Parameters

The crystal-field splittings and hyperfine-structure constants of Eu2+ in CaWO4 have been accurately measured at 4.2 °K and at 78 °K using the method of electron paramagnetic resonance. These measurements were intended to provide liquid-helium temperature parameters for ENDOR experiments presently in progress but showed significant differences from the earlier measurements of Bronstein and Volterra. Because of these differences and the considerable current interest in the values of these parameters for S-state ions, z-axis measurements were extended to cover the temperature range from 1.8 °K to room temperature.A very good fit to the measured line positions has been obtained by carrying out an exact diagonalization of the spin Hamiltonian within the 8S7/2 manifold. The parameters fitted are [Formula: see text], [Formula: see text], b20, b40, b44, b60, b44, A, and B. Residual discrepancies, of the order of a tenth of a line width, are shown to be consistent with the presence of a purely ionic quadrupole interaction and an interaction between the nuclear quadrupole moment and the crystalline electric field. The temperature variation of the dipolar hyperfine-coupling constant is shown to be consistent with the theory of Šimánek and Orbach as extended to rare earth ions in cubic lattices by Menne, Ames, and Lee if a Θ of 150 °K is assumed. Within the restrictions imposed by the lack of thermodynamic data and the assumption of a point-charge lattice, it is shown that the temperature dependence of the fourth- and sixth-order crystal-field parameters is consistent with the predominance of a splitting mechanism at least quadratic and more probably of fourth power in the crystalline potential. The second-order axial parameter is found to have a temperature dependence which can not be explained in terms of a single mechanism.

Paramagnetic resonance in some lanthanon ethyl sulphates

1958 ◽  
Vol 245 (1241) ◽  
pp. 156-174 ◽  
Keyword(s):  
Field Theory ◽  
Rare Earth ◽  
Hyperfine Structure ◽  
Single Crystals ◽  
Crystal Field ◽  
Nuclear Data ◽  
Rare Earth Ions ◽  
Experimental Results ◽  
Crystal Field Theory ◽  
Paramagnetic Resonance

Paramagnetic resonance in rare earth ions with an even number of unpaired 4ƒ electrons is discussed with particular reference to experimental results in Pr 3+ , Tb 3+ and Ho 3+ ions in single crystals of the ethyl sulphates. The crystal field theory of Elliott & Stevens is used to interpret the results. Some second-order perturbation mechanisms are considered which give rise to apparent quadrupole and hyperfine structure interactions. The following nuclear data are obtained from these experiments : 141 Pr : I = 5/2 ; │ μ │= 3.92 ± 0.2 n. m. ; 159 Tb : I = 3/2 ; │ μ │= 1.52 ± 0.08 n. m. ; 167 Ho : I = 7/2 ; μ = + 3.29 ± 0.17 n. m. ; Q = + 0.7 ± 0.7 barn.

scholarly journals Широкополосная ЭПР-спектроскопия кристалла SrY-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=-:Ho-=SUP=-3+-=/SUP=-

2022 ◽  
Vol 130 (1) ◽  
pp. 28
Author(s):  
Г.С. Шакуров ◽  
Б.З. Малкин ◽  
Р.Г. Батулин ◽  
А.Г. Киямов
Keyword(s):  
Hyperfine Structure ◽  
Single Crystals ◽  
Crystal Field ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Zero Field ◽  
Frequency Range ◽  
Energy Gaps ◽  
Scattering Spectra ◽  
Structure Constants

EPR spectra of impurity Ho3+ ions in oriented SrY2O4 single-crystals are registered at the temperature 4.2 K in the frequency range from 70 to 180 GHz. The results of measurements evidence for the substitution of Ho3+ ions for the Y3+ ions at the structurally nonequivalent sites R1 and R2 with the local Cs point symmetry. The values of g-factors, hyperfine structure constants and the energy gaps berween the ground and the first excited non-degenherate crystal-field sublevels of the ground 5I8 multiplet are determined. The observed specific features of the ground states of Но3+ ions (non-Kramers doublets with the zero-field splittings of 4.30 and 1.67 cm-1) open a possibility to identify transitions in optical spectra of SrY2O4:Ho and inelastic neutron scattering spectra of SrHo2O4 crystals.

scholarly journals Rapid and precise determination of zero-field splittings by terahertz time-domain electron paramagnetic resonance spectroscopy

2017 ◽  
Vol 8 (11) ◽  
pp. 7312-7323 ◽  
Author(s):  
Jian Lu ◽  
I. Ozge Ozel ◽  
Carina A. Belvin ◽  
Xian Li ◽  
Grigorii Skorupskii ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance Spectroscopy ◽  
Spin Transition ◽  
Precise Determination ◽  
Resonance Spectroscopy ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Paramagnetic Resonance ◽  
Free Induction ◽  
Electron Paramagnetic

Single-cycle THz fields induce free-induction decays from high-spin transition-metal complexes, yielding THz EPR spectra and zero-field splitting parameters from a simple tabletop measurement.

Sign in / Sign up

Export Citation Format

Share Document