The theory of electron spin-echo signal decay resulting from dipole-dipole interactions between paramagnetic centers in solids

Salikhov, K. M.; Dzuba, Sergei A.; Raitsimring, Arnold M.

doi:10.1016/0022-2364(81)90216-x

Cited by 106 publications

(177 citation statements)

References 3 publications

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“…Above, ID  is the rate of the instantaneous diffusion process associated with the change of the local magnetic field induced by the flipping nearby gadolinium spins at the application of the second ( ) pulse of the spin-echo sequence [29]. This rate was estimated as…”

Section: A Epr Spectra and Transitionsmentioning

confidence: 99%

“…At infinite temperature, 0.25 The second studied mechanism was the spectral diffusion [28,29], in which the local fields were fluctuated by spontaneous flips of the nearby spins induced by the spin-lattice and by the magnetic dipole interactions. The latter, however, were negligible since the dipolar-induced flip-flop processes are unfavorable when…”

Section: A Epr Spectra and Transitionsmentioning

confidence: 99%

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Coherent spin dynamics in a gadolinium-dopedCaWO4crystal

et al. 2017

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We report the first observation of Rabi oscillations in the spin-7/2 ensemble of trivalent gadolinium ions hosted in CaWO4 single crystal. A number of transitions within the lowest electronic multiplet S of Gd 3+ ion are studied using a combination of continuous-wave and pulsed electron paramagnetic resonance spectroscopy. The corresponding Rabi damping curves and the spin coherence times are detected at varying strengths of the microwave field. These data are well reproduced by a theoretical model which accounts for the intrinsic inhomogeneity of the microwave field within the microwave resonator and the magnetic dipole interactions in the diluted spin ensemble. The results indicate that the studied 8-level ground manifold of Gd 3+ ion can represent an effective three-qubit quantum system.

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Section: A Epr Spectra and Transitionsmentioning

confidence: 99%

Section: A Epr Spectra and Transitionsmentioning

confidence: 99%

Coherent spin dynamics in a gadolinium-dopedCaWO4crystal

et al. 2017

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“…The dimensionless correction coefficient, κ < 1, reflects mainly the non-ideality of the microwave pulse shape and also partial destruction of the instantaneous diffusion effect by electron spin-lattice relaxation. 9 Note that in EPR, the pulse excitation bandwidth is normally much less than the total linewidth. The optimal conditions to observe the effect of instantaneous diffusion are attained by setting γ t p B 1 = π .…”

Section: "Instantaneous Diffusion" Mechanism In Ese Decaymentioning

confidence: 99%

Communication: Orientational self-ordering of spin-labeled cholesterol analogs in lipid bilayers in diluted conditions

Kardash

Dzuba

2014

The Journal of Chemical Physics

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Lipid-cholesterol interactions are responsible for different properties of biological membranes including those determining formation in the membrane of spatial inhomogeneities (lipid rafts). To get new information on these interactions, electron spin echo (ESE) spectroscopy, which is a pulsed version of electron paramagnetic resonance (EPR), was applied to study 3β-doxyl-5α-cholestane (DCh), a spin-labeled analog of cholesterol, in phospholipid bilayer consisted of equimolecular mixture of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine and 1,2-dioleoyl-sn-glycero-3-phosphocholine. DCh concentration in the bilayer was between 0.1 mol.% and 4 mol.%. For comparison, a reference system containing a spin-labeled 5-doxyl-stearic acid (5-DSA) instead of DCh was studied as well. The effects of "instantaneous diffusion" in ESE decay and in echo-detected (ED) EPR spectra were explored for both systems. The reference system showed good agreement with the theoretical prediction for the model of spin labels of randomly distributed orientations, but the DCh system demonstrated remarkably smaller effects. The results were explained by assuming that neighboring DCh molecules are oriented in a correlative way. However, this correlation does not imply the formation of clusters of cholesterol molecules, because conventional continuous wave EPR spectra did not show the typical broadening due to aggregation of spin labels and the observed ESE decay was not faster than in the reference system. So the obtained data evidence that cholesterol molecules at low concentrations in biological membranes can interact via large distances of several nanometers which results in their orientational self-ordering.

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“…Below 160K, the CS 2 solvent freezes as a polycrystal, leaving regions of high fullerene concentration around grain boundaries. This dramatically increases the local spin concentration, and T 2 becomes extremely short due to dipolar spin coupling (the so-called instantaneous diffusion effect [12,13,14]). …”

Section: Relaxation Of N@c60 In Cs2mentioning

confidence: 99%

Electron spin relaxation of N@C60 in CS2

Morton

Tyryshkin

Ardavan

et al. 2006

The Journal of Chemical Physics

111

127

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We examine the temperature dependence of the electron spin relaxation times of the molecules N@C60 and N@C70 (which comprise atomic nitrogen trapped within a carbon cage) in liquid CS2 solution. The results are inconsistent with the fluctuating zero field splitting (ZFS) mechanism, which is commonly invoked to explain electron spin relaxation for S ≥ 1 spins in liquid solution, and is the mechanism postulated in the literature for these systems. Instead, we find an Arrhenius temperature dependence for N@C60, indicating the spin relaxation is driven primarily by an Orbach process. For the asymmetric N@C70 molecule, which has a permanent ZFS, we resolve an additional relaxation mechanism caused by the rapid reorientation of its ZFS. We also report the longest coherence time (T2) ever observed for a molecular electron spin, being 0.25 ms at 170K.

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The theory of electron spin-echo signal decay resulting from dipole-dipole interactions between paramagnetic centers in solids

Cited by 106 publications

References 3 publications

Coherent spin dynamics in a gadolinium-dopedCaWO4crystal

Coherent spin dynamics in a gadolinium-dopedCaWO4crystal

Communication: Orientational self-ordering of spin-labeled cholesterol analogs in lipid bilayers in diluted conditions

Electron spin relaxation of N@C60 in CS2

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