Spin diffusion in multiple pulse spin-locking in solids containing paramagnetic impurities

2010 ◽  
Vol 38 (4) ◽  
pp. 84-89
Author(s):  
G.B. Furman ◽  
S.D. Goren ◽  
A.M. Panich ◽  
A.I. Shames ◽  
T. Nakajima
Keyword(s):  
Spin Diffusion ◽  
Multiple Pulse ◽  
Paramagnetic Impurities ◽  
Spin Locking

Spin Diffusion in Pure Multiple-Pulse NQR

2000 ◽  
Vol 55 (1-2) ◽  
pp. 54-60 ◽  
Author(s):  
G. B. Furman ◽  
S. D. Goren ◽  
A. M. Panich ◽  
A. I. Shames
Keyword(s):  
Spin Diffusion ◽  
Diffusion Processes ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Effective Field ◽  
Spin Lattice Relaxation ◽  
Multiple Pulse ◽  
Spin Lattice ◽  
Paramagnetic Impurities ◽  
Spin Locking

We present a detailed theoretical and experimental NQR multiple-pulse spin-locking study of spin-lattice relaxation and spin diffusion processes in the presence of paramagnetic impurities in solids. The obtained diffusion equation was obtained allows to find the time dependence of the magnetization in the effective field. The spin lattice relaxation times were calculated, both for direct and diffusion regimes, as functions of the correlation time and multiple-pulse parameters. Measurements of relaxation times in rotating frame allow to determine the diffusion coefficient and the radius of the diffusion barrier in γ-irradiated polycrystalline samples of NaCIO3.

scholarly journals Theoretical investigations of quantum correlations in NMR multiple-pulse spin-locking experiments

2018 ◽  
Vol 17 (4) ◽  
Author(s):  
S. A. Gerasev ◽  
A. V. Fedorova ◽  
E. B. Fel’dman ◽  
E. I. Kuznetsova
Keyword(s):  
Quantum Correlations ◽  
Multiple Pulse ◽  
Theoretical Investigations ◽  
Spin Locking

Multiple-Pulse Spin Locking in Dipolar Solids.

1977 ◽  
Vol 39 (13) ◽  
pp. 850-850 ◽  
Author(s):  
W. -K. Rhim ◽  
D. P. Burum ◽  
D. D. Elleman
Keyword(s):  
Multiple Pulse ◽  
Spin Locking

Multiple-pulse spin locking in nanofluids

RSC Advances ◽  
2015 ◽  
Vol 5 (55) ◽  
pp. 44247-44257 ◽  
Author(s):  
Gregory B. Furman ◽  
Shaul D. Goren ◽  
Victor M. Meerovich ◽  
Vladimir L. Sokolovsky
Keyword(s):  
Relaxation Time ◽  
Water Molecules ◽  
Nuclear Spins ◽  
Multiple Pulse ◽  
Spin Locking ◽  
Analytical Expressions

The multiple pulse spin locking dynamics of the nuclear spins in nanofluids was studied. Oriented (a) and disoriented (b) nanocavities containing water molecules (c) were considered. Analytical expressions for the magnetization and the relaxation time were obtained.

On dipole-Zeeman cross relaxation in multiple-pulse spin locking

1981 ◽  
Vol 107 (2) ◽  
pp. K159-K162
Author(s):  
M. M. Kucherov ◽  
A. V. Ponomarenko ◽  
V. E. Zobov
Keyword(s):  
Cross Relaxation ◽  
Multiple Pulse ◽  
Spin Locking

Relaxation Processes in NQR Multiple-Pulse Spin-Locking

1986 ◽  
Vol 41 (1-2) ◽  
pp. 366-369 ◽  
Author(s):  
N. E. Ainbinder ◽  
G. B. Furman ◽  
G. E. Kibrik ◽  
A. Yu. Poljakov ◽  
I. G. Shaposhnikov
Keyword(s):  
Time Constant ◽  
Pulse Sequence ◽  
Spin Echo ◽  
Rate Equations ◽  
Relaxation Processes ◽  
Quasi Equilibrium ◽  
Multiple Pulse ◽  
Spin Lattice ◽  
Kinetic Coefficients ◽  
Spin Locking

A theory of the spin-lattice and spin-spin relaxation processes in quadrupole spin systems with I > 1/2 in the situation of the multiple-pulse NQR spin locking is proposed for the pulse sequence MW-4. The theory is based on the assumption that for t ≳ T2 the change of the spin system is a quasi-equilibrium process. Rate equations for inverse generalized temperatures are obtained and the kinetic coefficients calculated for the case o f exponential correlation functions. The above assumption was confirmed for some substances containing the 35Cl and 123Sb, and the time constant T1e characterizing the spin echo signal decay was investigated and compared with the time constant T1q, in the case of continuous spin locking.

Nitrogen-14 NQR Multiple-Pulse Spin-locking in the Axial Electric Field Gradient

1994 ◽  
Vol 49 (1-2) ◽  
pp. 97-102 ◽  
Author(s):  
G . B. Furman
Keyword(s):  
Electric Field ◽  
Floquet Theory ◽  
Electric Quadrupole ◽  
Dipole Interaction ◽  
Quasi Equilibrium ◽  
Multiple Pulse ◽  
Crystal Electric Field ◽  
Equilibrium Magnetization ◽  
Spin Locking ◽  
Pulse Radiofrequency

Abstract The behavior of a nuclear spin-1 system with the Hamiltonian including: a) the interaction of the electric quadrupole moment of nuclei with the axial gradient of the crystal electric field; b) a homonuclear and heteronuclear dipole-dipole coupling; and c) the interaction with a multiple pulse radiofrequency field of arbitrary orientation was considered. The effective Hamiltonian is con­structed by using the Floquet theory. The secular parts of the homonuclear and heteronuclear dipole-dipole interaction was found and the quasi-equilibrium magnetization was calculated.

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