Hyperfine Structure of Technetium-99 from Paramagnetic Resonance

1958 ◽  
Vol 110 (4) ◽  
pp. 842-843 ◽  
Author(s):  
W. Low ◽  
P. M. Llewellyn
Keyword(s):  
Hyperfine Structure ◽  
Paramagnetic Resonance

Theoretical Studies on the Gyromagnetic Factors and the Hyperfine Structure Constants for the Tetragonal Copper Center in KTaO3

2005 ◽  
Vol 60 (8-9) ◽  
pp. 615-618 ◽  
Author(s):  
Hui-Ning Dong
Keyword(s):  
Experimental Data ◽  
Electron Paramagnetic Resonance ◽  
Hyperfine Structure ◽  
Defect Structure ◽  
Electrostatic Repulsion ◽  
Theoretical Studies ◽  
Paramagnetic Resonance ◽  
Copper Center ◽  
Structure Constants ◽  
Electron Paramagnetic

The gyromagnetic factors g∥, g⊥ and the hyperfine structure constants A∥ and A⊥ of the tetragonal Cu2+ center in KTaO3 are theoretically studied in this work. Based on the analyses of the electron paramagnetic resonance results of this center, it is found that the impurity Cu2+ occupies the octahedral Ta5+ site, associated with a nearest-neighbouring oxygen vacancy VO along the C4 axis. Due to the electrostatic repulsion of VO, Cu2+ is displaced away from VO by ΔZ(≈ −0.29 Å ) along the C4 axis. The theoretical values of the g and A factors based on the above defect structure and the impurity displacement agreee reasonably with the experimental data.

OPTICAL FARADAY ROTATION STUDIES OF PARAMAGNETIC RESONANCE AND RELAXATION IN PRASEODYMIUM ETHYLSULPHATE

1965 ◽  
Vol 43 (12) ◽  
pp. 2361-2373 ◽  
Author(s):  
David J. Griffiths ◽  
Hans Glättli
Keyword(s):  
Hyperfine Structure ◽  
Liquid Helium ◽  
Faraday Rotation ◽  
Broad Band ◽  
Relaxation Times ◽  
Electron System ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Helium Bath ◽  
Half Power

The technique of detecting electron paramagnetic resonance and measuring paramagnetic relaxation times at liquid-helium temperatures by the magneto-optical Faraday rotation has been applied to the even number (4f2) electron system of Pr3+ in praseodymium ethylsulphate (PrES). The EPR spectrum (X band) of undiluted PrES at 1.37 °K is a broad band extending over several kilo-gauss with no evidence of hyperfine structure. The band intensity decreases at [Formula: see text] and covers [Formula: see text] from its maximum to half-power point. The absence of any hyperfine structure indicates that crystal-field distortion is the main source of line broadening.The relaxation times measured as a function of temperature over the range 1.40 to 2.18 °K and at 4.22 °K range from 0.1 to 10 msec. For [Formula: see text], τ decreases from 0.40 to 0.15 msec, is proportional to T−(3.5 ± 0.6), and is considered to be the phonon–bath relaxation time. Values of τ show a scatter within 0.20 ± 0.02 msec for [Formula: see text]. Near the λ point [Formula: see text], τ exhibits a very rapid increase, having a value of 0.20 msec at 2.155 °K and 0.85 msec at 2.165 °K. This behavior appears to be related to the energy exchange between the crystal and liquid-helium bath. Measurements of τ at 2.18 °K and 4.22 °K indicate that the rate at which the spin–phonon system returns to initial thermal equilibrium is governed by the thermal conductivity of the liquid-helium bath.

Growth and EPR properties of KSm(WO4)2 and KEr(WO4)2 single crystals

Open Physics ◽  
2012 ◽  
Vol 10 (2) ◽  
Author(s):  
Grzegorz Leniec ◽  
Tomasz Skibiński ◽  
Slawomir Kaczmarek ◽  
Przemyslaw Iwanowski ◽  
Marek Berkowski
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Hyperfine Structure ◽  
Single Crystals ◽  
Angular Dependence ◽  
Growth Conditions ◽  
Magnetic Interactions ◽  
Epr Spectra ◽  
Paramagnetic Resonance ◽  
Temperature Dependences ◽  
Electron Paramagnetic

AbstractGrowth conditions and electron paramagnetic resonance investigations of two well oriented KSm(WO4)2 and KEr(WO4)2 single crystals have been presented and discussed. Hyperfine structure of Sm3+ ion was detected and analyzed for angular and temperature dependences. EPR spectra of KEr(WO4)2 and its angular dependence showed the presence of 5 magnetically nonequivalent Er centers in the crystal. A change in the type of magnetic interactions was analyzed using mixed (Gaussian and Lorentzian) fits of the EPR spectra.

Paramagnetic resonance hyperfine structure of hexachloroprotactinate(IV)

1988 ◽  
Vol 37 (10) ◽  
pp. 4893-4899 ◽  
Author(s):  
Ramiro Arratia-Perez ◽  
Dennis S. Marynick
Keyword(s):  
Hyperfine Structure ◽  
Paramagnetic Resonance
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