Time-Domain Electron Paramagnetic Resonance as a Probe of Electron-Electron Spin-Spin Interaction in Spin-Labeled Low-Spin Iron Porphyrins

1995 ◽  
Vol 117 (7) ◽  
pp. 2049-2057 ◽  
Author(s):  
Margaret H. Rakowsky ◽  
Kundalika M. More ◽  
Alexander V. Kulikov ◽  
Gareth R. Eaton ◽  
Sandra S. Eaton
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Spin ◽  
Time Domain ◽  
Spin Interaction ◽  
Iron Porphyrins ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

An X-band time domain electron paramagnetic resonance spectrometer

Pramana ◽  
1986 ◽  
Vol 27 (5) ◽  
pp. 661-677 ◽  
Author(s):  
Ranjan Das ◽  
Balu Venkataraman ◽  
Vinod R Bhagat ◽  
Ajit S Ghangrekar ◽  
Thomas Kuruvilla ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Time Domain ◽  
Electron Paramagnetic Resonance Spectrometer ◽  
Paramagnetic Resonance ◽  
X Band ◽  
Electron Paramagnetic

scholarly journals Димерная самоорганизация примесных ионов эрбия в синтетическом форстерите

2019 ◽  
Vol 61 (2) ◽  
pp. 313
Author(s):  
Р.Б. Зарипов ◽  
Л.В. Мингалиева ◽  
В.Ф. Тарасов ◽  
Е.В. Жариков ◽  
К.А. Субботин ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Resonance Method ◽  
Magnetic Characteristics ◽  
Spin Interaction ◽  
Magnesium Ions ◽  
Crystallographic Position ◽  
Paramagnetic Resonance ◽  
Effective Spin ◽  
Erbium Ions ◽  
Electron Paramagnetic

AbstractThe electron paramagnetic resonance spectra of impurity trivalent erbium ions in synthetic forsterite single crystals (Mg_2SiO_4) have been studied by the electron paramagnetic resonance method in the X and Q frequency bands. It is found that erbium ions predominantly substitute for magnesium ions in crystallographic position M1 that is characterized by the inversion symmetry of the crystal field. In this case, a pronounced effect of dimer self-organization of erbium ions during the crystal growth takes place; the effect is manifested in the fact that the concentration of erbium dimer associates consisting of two closely spaced ions bound by the spin– spin interaction is several orders of magnitude higher than the concentration of dimer associates that form randomly at a statistical distribution of impurity ions in the forsterite crystal lattice. The directions of the main magnetic axes and the parameters of the effective spin Hamiltonian describing the magnetic characteristics of impurity erbium centers have been determined.

scholarly journals Synthesis and electron paramagnetic resonance studies of chiral spin-labeled crown ethers

1984 ◽  
Vol 62 (3) ◽  
pp. 489-497 ◽  
Author(s):  
H. Dugas ◽  
P. Keroack ◽  
M. Ptak
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Crown Ether ◽  
Crown Ethers ◽  
Spin Interaction ◽  
Ion Binding ◽  
Paramagnetic Resonance ◽  
Dynamical Fluctuation ◽  
Electron Paramagnetic

The synthesis of syn and anti chiral dinitroxide [18]-crown-6 ethers and of a tetranitroxide crown ether is described. The existence of a spin–spin interaction for the syn isomer makes this spin-labeled crown ether probe particularly useful to follow by epr the effects of K+ ion binding, pH, solvent, and temperature. These observations are discussed in terms of a global dynamical fluctuation of the substituted crown ether.

Identification of Niobium in 4H-SiC by EPR and Ab Initio Studies

2012 ◽  
Vol 717-720 ◽  
pp. 217-220 ◽  
Author(s):  
Nguyen Tien Son ◽  
Viktor Ivády ◽  
Adam Gali ◽  
Andreas Gällström ◽  
Stefano Leone ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
High Temperature ◽  
Ab Initio ◽  
Electron Spin ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Paramagnetic Resonance ◽  
Form Complex ◽  
Electron Paramagnetic ◽  
Neutral Charge State

In unintentionally Nb-doped 4H-SiC grown by high-temperature chemical vapor deposition (HTCVD), an electron paramagnetic resonance (EPR) center with C1h symmetry and an electron spin S=1/2 was observed. The spectrum shows a hyperfine structure consisting of ten equal-intensity hyperfine (hf) lines which is identified as due to the hf interaction between the electron spin and the nuclear spin of 93Nb. An additional hf structure due to the interaction with two equivalent Si neighbors was also observed. Ab initio supercell calculations of Nb in 4H-SiC suggest that Nb may form complex with a C-vacancy (VC) resulting in an asymmetric split-vacancy (ASV) defect, NbSi-VC. Combining results from EPR and supercell calculations, we assign the observed Nb-related EPR center to the hexagonal-hexagonal configuration of the AVS defect in the neutral charge state, (NbSi-VC)0.

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