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

Glotova, Olga; Ponamareva, N.; Sinyavsky, N.; Nogaj, B.

doi:10.1016/j.ssnmr.2011.02.002

Cited by 3 publications

(4 citation statements)

References 18 publications

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“…As explained in, [15] the geometrical phase of the NQR signal disappears more slowly with the change of the pulse duration than does the decay of the free induction signal. So it is facilitating the possibility to determine the asymmetry parameter of the EFG tensor.…”

Section: Asymmetry Of the Efg Tensor In The Ge-as-se System Of Chalcomentioning

confidence: 85%

“…Applying new research methods in the NQR spectroscopy [on the basis of the spin echo signal theory for very wide NQR lines and on examining the geometrical phase (Berry phases) of NQR signals] to determine the asymmetry parameter of the EFG in the examined semiconductors allowed much information to be obtained in relation to the local structure of these compounds. [1][2][3][4][5] Basic properties of solids first of all are determined by their structure at the atomic level (short-range ordering). For vitreous and amorphous solids, the disordering is found already at a short-range level and is a distinctive property of substances in the amorphous state.…”

Section: Introductionmentioning

confidence: 99%

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Study of the EFG tensor at ⁷⁵As nuclei in Ge‐As‐Se chalcogenide glasses

Bolebrukh

Sinyavsky

Dobosz

et al. 2013

Magnetic Reson in Chemistry

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Asymmetry parameters of the electric field gradient tensor at (75) As nuclei were determined for chalcogenide glassy semiconductors (CGS) of the Ge-As-Se system by comparing the experimental and simulated (75) As nuclear quadrupole resonance nutation interferograms. The electric field gradient asymmetry in CGS was analyzed, and it is believed that a structural change in these glassy semiconductors takes place at r¯ = 2.425. Electron paramagnetic resonance spectra of the Ge-As-Se system were obtained for the first time. A comparison was made between the results of analysis of the Ge-As-Se system by nuclear quadrupole resonance and electron paramagnetic resonance methods, and this allowed us to make the supposition that a structural phase transition occurs at r¯ = 2.4 from two-dimensional to three-dimensional CGS structure.

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Section: Asymmetry Of the Efg Tensor In The Ge-as-se System Of Chalcomentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Study of the EFG tensor at ⁷⁵As nuclei in Ge‐As‐Se chalcogenide glasses

Bolebrukh

Sinyavsky

Dobosz

et al. 2013

Magnetic Reson in Chemistry

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“…NQR experiments have been carried out using a pulsed FT-NQR spectrometer type NQS-300 from MBC ELECTRONICS Company. A two-pulse Hann spin-echo pulse sequence 2 was used for obtaining a NQR line. For Ge-As-Se samples the duration of the first pulse 2 was 5 µs, the space τ between pulses was 60 μs, the duration of the second pulse (π) was 10 μs, the repetition period was 150 ms.…”

Section: Methodsmentioning

confidence: 99%

“…In contrast to nuclear magnetic resonance, the NQR resonance frequencies are directly determined by the crystalline structure. Application of the new research methods in NQR spectroscopy (creation of the theory of the echo signal for a very broad NQR lines [1] and the geometric phase of the signal in the NQR experiments [2]) to determine the asymmetry of the electric field gradient tensor (EFG) in disordered structures allowed us to obtain more information on the structure of compounds of this type. The NQR studies have been accompanied by the electron paramagnetic resonance (EPR) study which provides information about the short-range order of the atomic arrangement.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the structure of chalcogenide glassy semiconductors in three-component systems of Ge-As-Se and As-Sb-Se by means of NQR and EPR spectroscopy

et al. 2013

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Abstract:The structure of chalcogenide glassy semiconductors in three-component systems of Ge-As-Se and AsSb-Se has been studied by means of both NQR (nuclear quadrupole resonance) and EPR (electron paramagnetic resonance) spectroscopy. It is investigated that in the glasses of both systems the value of the electric field gradient at the resonating nuclei grows with increasing concentration of the clusters As 2 Se 3 and Sb 2 Se 3 , thereby increasing the NQR resonance frequencies. It appears that for the Ge-As-Se system the structural transition from a two-dimensional to three-dimensional structure occurs at average coordination number¯ = 2.45. The EPR spectral parameters of glasses depend on the composition, the average coordination number and the temperature, and these are discussed. The effect of "ageing" for CGS (chalcogenide glassy semiconductors) of As-Sb-Se system due to partial crystallization of the sample is observed from the EPR spectra.

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

Cited by 3 publications

References 18 publications

Study of the EFG tensor at ⁷⁵As nuclei in Ge‐As‐Se chalcogenide glasses

Study of the EFG tensor at ⁷⁵As nuclei in Ge‐As‐Se chalcogenide glasses

Experimental study of the structure of chalcogenide glassy semiconductors in three-component systems of Ge-As-Se and As-Sb-Se by means of NQR and EPR spectroscopy

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

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

Cited by 3 publications

References 18 publications

Study of the EFG tensor at 75As nuclei in Ge‐As‐Se chalcogenide glasses

Study of the EFG tensor at 75As nuclei in Ge‐As‐Se chalcogenide glasses

Experimental study of the structure of chalcogenide glassy semiconductors in three-component systems of Ge-As-Se and As-Sb-Se by means of NQR and EPR spectroscopy

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

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Study of the EFG tensor at ⁷⁵As nuclei in Ge‐As‐Se chalcogenide glasses

Study of the EFG tensor at ⁷⁵As nuclei in Ge‐As‐Se chalcogenide glasses