Determination of the electric field gradient asymmetry from Berry’s phase in NQR of powder samples

Sinyavsky, N.; Korotey, E. V.; Maćkowiak, M.

doi:10.1016/j.molstruc.2006.07.009

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…Beyond characterizing QN spin systems, NQR spectroscopy has proven its scientific versatility in several applications and studies as, for example, research on molecular structure [66,67], superconductors [68], semiconductors [69], and phase transitions [70,71], as well as quantum computing [72] and the authentication of medicines [73].…”

Section: A Nqr Spectroscopymentioning

confidence: 99%

Tuning Nuclear Quadrupole Resonance: A Novel Approach for the Design of Frequency-Selective MRI Contrast Agents

et al. 2018

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The interaction between water protons and suitable quadrupolar nuclei (QN) can lead to quadrupole relaxation enhancement (QRE) of proton spins, provided the resonance condition between both spin transitions is fulfilled. This effect could be utilized as a frequency selective mechanism in novel, responsive T 1 shortening contrast agents (CAs) for magnetic resonance imaging (MRI). In particular, the proposed contrast mechanism depends on the applied external flux density-a property that can be exploited by special field-cycling MRI scanners. For the design of efficient CA molecules, exhibiting narrow and pronounced peaks in the proton T 1 relaxation dispersion, the nuclear quadrupole resonance (NQR) properties, as well as the spin dynamics of the system QN-1 H, have to be well understood and characterized for the compounds in question. In particular, the energy-level structure of the QN is a central determinant for the static flux densities at which the contrast enhancement appears. The energy levels depend both on the QN and the electronic environment, i.e., the chemical bonding structure in the CA molecule. In this work, the NQR properties of a family of promising organometallic compounds containing 209 Bi as QN have been characterized. Important factors like temperature, chemical structure, and chemical environment have been considered by NQR spectroscopy and ab initio quantum chemistry calculations. The investigated Bi-aryl compounds turned out to fulfill several crucial requirements: NQR transition frequency range applicable to clinical 1.5-and 3 T MRI systems, low temperature dependency, low toxicity, and tunability in frequency by chemical modification.

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Section: A Nqr Spectroscopymentioning

confidence: 99%

Tuning Nuclear Quadrupole Resonance: A Novel Approach for the Design of Frequency-Selective MRI Contrast Agents

et al. 2018

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“…Despite many theoretical publications devoted to Berry phase in NQR and NMR, there are few experimental works, and the experiments with the registration of Berry phase in the pure NQR are not described except for Tycko (single crystal, g = 0), and [12,13] (powder, g = 0).…”

Section: Introductionmentioning

confidence: 99%

“…In [12,13], Tycko experiment for the pure NQR were extended to the nuclei with the spins I = 3/2 and I = 1 for the case of the powder and for the asymmetry parameter not identically zero. In fact, these works became the first attempt of the practical use of the Berry phase appearance in the pure NQR for determination of the asymmetry parameter of the EFG tensor at the nuclei with the spin I = 3/2 in the powders.…”

Section: Introductionmentioning

confidence: 99%

The Geometrical Phase in the PEANUT Experiments for the NQR Spectroscopy for the Spins I = 3/2

Sinyavsky

Kostrikova

2015

Appl Magn Reson

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The results of the research of a non-cyclic geometrical phase of the 35 Cl nuclear quadrupole resonance (NQR) signals are presented, caused by the character of nuclear magnetization trajectory under radio-frequency excitation by means of PEANUT sequence for powdered samples. The analytical math expressions for a geometrical phase in NQR for a spin I = 3/2 while rotating nuclear magnetization by means of the PEANUT pulse sequence with frequency detuning and variable duration of the pulse were obtained. It is shown that the measured phase for this sequence is a geometrical phase and it may accumulate up to Dx = 0 with a change of duration of the radio-frequency pulse t 0 w . The experiment with the phase inversion and with nutation detection by means of echo amplitude was first applied in NQR jointly with measuring a geometrical phase. Since nutations detection and excitation in the PEANUT method are completely separate in time, experiments with high nutation frequencies become possible. The experimental examples supporting theoretically predicted distinctions of the geometrical phase for the PEA-NUT method in 35 Cl NQR are presented. An alternative nutation experiment is proposed to determine asymmetry parameter g for the nuclei with the spin I = 3/2 in powders proceeding from the nature of a non-cyclic geometrical phase accumulation.

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“…In our publications [12,13] the Tycko's experiments for pure NQR were extended for the nuclei with spins I¼3/2 and 1 for the substances in powder whose asymmetry parameter was not equal to zero. These our works were the first attempts at practical use of the Berry phase manifestation in pure NQR to obtain the asymmetry parameter of the EFG tensor on the nuclei with spin I¼3/2 in powdered substances.…”

Section: Introductionmentioning

confidence: 99%

Non-cyclic geometric phase of nuclear quadrupole resonance signals of powdered samples

Glotova

Ponamareva

Sinyavsky

et al. 2011

Solid State Nuclear Magnetic Resonance

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Determination of the electric field gradient asymmetry from Berry’s phase in NQR of powder samples

Cited by 4 publications

References 6 publications

Tuning Nuclear Quadrupole Resonance: A Novel Approach for the Design of Frequency-Selective MRI Contrast Agents

Tuning Nuclear Quadrupole Resonance: A Novel Approach for the Design of Frequency-Selective MRI Contrast Agents

The Geometrical Phase in the PEANUT Experiments for the NQR Spectroscopy for the Spins I = 3/2

Non-cyclic geometric phase of nuclear quadrupole resonance signals of powdered samples

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