Experimental study of cross-relaxation in multipulse NQR spin-locking

Kibrik, G. E.; Poljakov, A. Yu.

doi:10.1016/0022-2860(94)08452-n

Cited by 6 publications

(6 citation statements)

References 14 publications

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“…This results (33) is in agreement to that obtained in the experiments [17], the nuclear magnetization decay is well described by two exponential functions. Using (26) and (30) we can obtain the dependence of the cross-relaxation rate 1 T cross 1e on pulse sequence parameters θ:…”

Section: Resultssupporting

confidence: 94%

“…From (34) and (36) we have Figure 3 represents the good agreement between fitting using (37) and experimental data for 35 Cl (a) at 77 K [17]. It has been shown [17] that the relaxation time T exp 1e very sensitively to changing the weak magnetic field.…”

Section: Resultsmentioning

confidence: 71%

“…It has been shown [17] that the relaxation time T exp 1e very sensitively to changing the weak magnetic field. T Figure 4 demonstrates a good agreement of the dependence of the relaxation rate describing by the formula (40) on the magnetic field strength obtained for 35 Cl (b ) at 295 K. In the (40), T exp 1e is the longer component of the measured relaxation time.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

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Cross-relaxation in multiple pulse NQR spin-locking

et al. 2008

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“…If the spin-lattice relaxation times T 1e and T 1 are closed, T 1e T 1 , then the magnetization of the nuclear spins I decays according to the expression This result (equation ( 33)) is in agreement with that obtained in the experiments [17]; the nuclear magnetization decay is well described by two exponential functions. To calculate the relaxation time T mix 1e (30), the correlation function ξ(τ ) (32) is needed.…”

Section: Resultssupporting

confidence: 83%

“…Figure 3 represents the good agreement between fitting using equation (37) with T 1e = 500 ms at 77 K and experimental data for 35 Cl (a) [17]. It has been shown [17] that the relaxation time T exp 1e is very sensitive to change in the weak magnetic field.…”

Section: Resultssupporting

confidence: 54%

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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