Relaxation in Pulsed EPR: Thermal Fluctuation of Spin-Hamiltonian Parameters of an Electron-Nuclear Spin-Coupled System in a Malonic Acid Single Crystal in a Strong Harmonic-Oscillator Restoring Potential

2021 ◽  
Author(s):  
Sushil K. Misra ◽  
Hamid Reza Salahi
Keyword(s):  
Harmonic Oscillator ◽  
Single Crystal ◽  
Malonic Acid ◽  
Nuclear Spin ◽  
Thermal Fluctuation ◽  
Coupled System ◽  
Spin Hamiltonian ◽  
Pulsed Epr ◽  
Hamiltonian Parameters

scholarly journals Aminoxyl Radicals of B/P Frustrated Lewis Pairs: Refinement of the Spin-Hamiltonian Parameters by Field- and Temperature-Dependent Pulsed EPR Spectroscopy

PLoS ONE ◽  
2016 ◽  
Vol 11 (6) ◽  
pp. e0157944 ◽  
Author(s):  
Marcos de Oliveira ◽  
Robert Knitsch ◽  
Muhammad Sajid ◽  
Annika Stute ◽  
Lisa-Maria Elmer ◽  
...  
Keyword(s):  
Epr Spectroscopy ◽  
Spin Hamiltonian ◽  
Frustrated Lewis Pairs ◽  
Temperature Dependent ◽  
Pulsed Epr ◽  
Hamiltonian Parameters ◽  
Aminoxyl Radicals ◽  
Lewis Pairs

EPR Studies of VO2+ in Ba(ClO4) 2 ・3H2O Single Crystals

1997 ◽  
Vol 52 (12) ◽  
pp. 849-854 ◽  
Author(s):  
Metin Yavuz ◽  
Hüseyin Kalkan ◽  
Ahmet Bulut ◽  
Şehriman Atalay ◽  
Emin Öztekin
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystal ◽  
Single Crystals ◽  
Axial Symmetry ◽  
Powder Sample ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
Vanadyl Ion ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

The results of an electron paramagnetic resonance (EPR) study of vanadyl ion VO2+ doped in single crystals of Ba(ClO4)2 - 3 H2O are reported. The spectra indicated the presence of two substitutional and interstitial sites depending on the orientation. The spin-Hamiltonian parameters were determined from single crystal and powder EPR data. These parameters were found to be axial symmetric for the powder sample, whereas they showed deviations from axial symmetry for the single crystal

Epr Spectra of VO2+ Doped in Na2C4H4O6 Single Crystals

2004 ◽  
Vol 59 (10) ◽  
pp. 669-673
Author(s):  
B. Karabulut ◽  
R. Tapramaz ◽  
F. Köksal
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Room Temperature ◽  
Epr Spectra ◽  
Spin Hamiltonian ◽  
Axially Symmetric ◽  
Angular Variation ◽  
Sodium Tartrate ◽  
Hamiltonian Parameters

EPR spectra of VO2+ ions in di-sodium tartrate, [Na2C4H4O6], single crystal and powder spectra have been studied at room temperature. The angular variation of the EPR spectra has shown that three different VO2+ complexes are located in different chemical environments, and each environment contains two magnetically inequvalent sites. The spin Hamiltonian parameters are determined, and these parameters have been used to assess the bonding coefficients of the VO2+ ion in the di-sodium tartrate lattice. The parallel and perpendicular components of axially symmetric g and hyperfine tensors are evaluated. The results are discussed.

scholarly journals Статический и динамический вклады в расщепление основного состояния Eu-=SUP=-2+-=/SUP=- в SrMoO-=SUB=-4-=/SUB=-

2019 ◽  
Vol 61 (5) ◽  
pp. 905
Author(s):  
А.Д. Горлов
Keyword(s):  
Thermal Expansion ◽  
Single Crystal ◽  
Impurity Center ◽  
Spin Hamiltonian ◽  
Lattice Thermal Expansion ◽  
Epr Spectrum ◽  
Small Temperature ◽  
Temperature Changes ◽  
Hamiltonian Parameters ◽  
Static Lattice

AbstractThe EPR spectrum of an Eu^2+ impurity center in a SrMoO_4 single crystal in the temperature range T = 1.8, 111–300 K has been studied, and the temperature changes in the spin Hamiltonian parameters describing the EPR spectrum of odd europium isotopes have been determined. It is shown that small temperature changes in the diagonal parameters of the spin Hamiltonian (for odd Eu^2+ isotopes) $$b_{2}^{0}$$ ( T ) = b _2( F ) + b _2( L ) and $$P_{2}^{0}$$ ( T ) = P _2( F ) + P _2( L ) are explained by the compensation of spin–phonon contributions b _2( F ) and P _2( F ) by the contributions of the lattice thermal expansion b _2( L ) and P _2( L ). The quantities b _2( L ) and P _2( L ) that are dependent on the static lattice parameters at a given temperature, are estimated in terms of the superposition Newman model. Then, the spin–phonon b _2( F ) and P _2( F ) contributions determined by the lattice ion vibrations are separated. An analysis shows that $$b_{2}^{0}$$ ( F ) and $$P_{2}^{0}$$ ( F ) > 0, b _2( L ) and P _2( L ) < 0, and the temperature behavior of the spin–phonon contribution is well described by G. Pfister’s model of local vibrations.

EPR and ENDOR of cubic ZnS: Mn2+

1977 ◽  
Vol 32 (7) ◽  
pp. 724-730 ◽  
Author(s):  
R. de Beer ◽  
F. Biesboer ◽  
G. van Veen
Keyword(s):  
Hyperfine Interaction ◽  
Single Crystal ◽  
Quadrupole Interaction ◽  
Electric Quadrupole ◽  
Electric Quadrupole Interaction ◽  
Spin Hamiltonian ◽  
Ka Band ◽  
A Value ◽  
Hamiltonian Parameters ◽  
First Time

Abstract The spin Hamiltonian parameters of 55Mn2+ in cubic ZnS have been determined by means of EPR and central-ion ENDOR, using Ka-band (35 GHz) microwaves. For the first time a value for the spherical electric quadrupole interaction of Mn2+ incorporated in a single crystal has been found. Also the ligand hyperfine interaction and the electric quadrupole interaction of the twelve Zn67 nuclei nearest to Mn2+ have been determined by means of ligand ENDOR.

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