NQR multiple-pulse spin-locking as a method of study of molecular motions in solids

Furman, G. B.; Kibrik, G. E.; Poljakov, A. Yu.; Shaposhnikov, I. G.

doi:10.1016/0022-2860(89)85040-9

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…The pulse angular duration is not determined in powder NQR, so, by analogy with NMR, we have considered that θ x = π 2 when the induction decay amplitude is maximum and θ x = π when it is minimum. The validity of such an approach in some multipulse experiments has been confirmed previously [12].…”

Section: Methodssupporting

confidence: 60%

Thermal mixing in multiple-pulse nuclear quadrupole resonance spin-locking

Beltjukov¹,

Kibrik²,

Furman³

et al. 2007

J. Phys.: Condens. Matter

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We report on an experimental and theoretical nuclear quadrupole resonance (NQR) multiple-pulse spin-locking study of the thermal mixing process in solids containing nuclei of two different sorts, I > 1/2 and S = 1/2, coupled by dipole-dipole interactions and influenced by an external magnetic field. Two coupled equations for the inverse spin temperatures of both the spin systems describing the mutual spin-lattice relaxation and the thermal mixing were obtained using the method of the nonequilibrium state operator. It is shown that the relaxation process is realized with non-exponential time dependence described by a sum of two exponents. The calculated relaxation time versus the multiple-pulse field parameters agrees well with the obtained experimental data in 1,4-dichloro-2-nitrobenzene. The calculated magnetization relaxation time versus the strength of the applied magnetic field agrees well with the obtained experimental data.

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Section: Methodssupporting

confidence: 60%

Thermal mixing in multiple-pulse nuclear quadrupole resonance spin-locking

Beltjukov¹,

Kibrik²,

Furman³

et al. 2007

J. Phys.: Condens. Matter

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“…This means that in a powder with possible such orientations, the observed magnetization, M, will be the superposition of the magnetization associated with individual crystalline. Nevertheless, the experimental results of the dependence of M (θ ) for the polycrystalline sample is similar to those of monocrystalline one in the range of θ from 0 up 3π/2 [12], which makes it possible to use the concept of the angular pulse duration for the polycrystalline sample. Using the projection operators e i mn for the nuclear spins I and ε …”

Section: Hamiltonian Of the Systemmentioning

confidence: 54%

“…By analogy with NMR, we had considered, that θ = π 2 when the induction decay amplitude is maximum and at θ = π it is minimum. The validity of such an approach in some multipulse experiments has been confirmed early [12]. The length of θ = π/2 was 7.5 μs.…”

Section: Methodsmentioning

confidence: 69%

Cross-relaxation in multiple pulse NQR spin-locking

et al. 2008

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The experimental and theoretical NQR multiple-pulse spin locking study of cross-relaxation process in solids containing nuclei of two different sorts I > 1/2 and S = 1/2 coupled by the dipole-dipole interactions and influenced by an external magnetic field. Two coupled equations for the inverse spin temperatures of the both spin systems describing the mutual spin lattice relaxation and the cross-relaxation were obtained using the method of the nonequilibrium state operator. It is shown that the relaxation process is realized with non-exponential time dependence describing by a sum of two exponents. The cross relaxation time is calculated as a function of the multiple-pulse field parameters which agree with the experimental data. The calculated magnetization cross relaxation time vs the strength of the applied magnetic field agrees well with the obtained experimental data.

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