Prompt quality monitoring of InSe and GaSe semiconductor crystals by the nuclear quadrupole resonance technique

Samila, Andriy; Lastivka, Galina; Хандожко, Виктор Александрович; Kovalyuk, Z. D.

doi:10.1134/s1063782616080200

Cited by 7 publications

(7 citation statements)

References 6 publications

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“…Samples cut from these ingots were investigated. Undoped monoselenides are distinguished by a low concentration of charge carriers (≤10 13 −10 14 cm −3 ) and a relatively low mobility (800-1000 cm 2 V −1 s −1 for n-InSe and 20-25 cm 2 V −1 s −1 for p-GaSe) [7]. The results of experimental studies of the NQR spectra of 69 Ga and 115 In isotopes obtained using the developed methods of pulsed radio spectroscopy are shown in Figures 11-14.…”

Section: Ga 115 In Nqr Study Of Gase and Insementioning

confidence: 99%

“…Gallium and indium monoselenides (GaSe, InSe) are semiconductor compounds of the A III B VI group. They possess a number of interesting physical properties and a specific chemical structure which has sparked interest in them over the past half century [1][2][3][4][5][6][7]. The increased interest in these materials is caused by the possibilities of their application: in nonlinear optics, in solar energy converters, in high-sensitivity infrared optical sensors, in solid-state current sources and high-sensitivity pressure sensors.…”

Section: Introductionmentioning

confidence: 99%

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A Low-Cost Digital Pulsed Coherent Spectrometer for Investigation of NQR in Layered Semiconductor GaSe and InSe Crystals

Hotra

Samila

2020

Electronics

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A low-cost digital pulsed nuclear quadrupole resonance (NQR) radio-spectrometer is proposed, all main modules of digital processing and synthesis of which on the field-programmable gate array (FPGA) are implemented. The input sensitivity of the device is of the order of 3 μV to 5 μV which allows conducting NQR studies in samples of relatively small dimensions. The application of the developed methods of NQR pulsed radio spectroscopy made it possible to increase spectral resolution, improve spectral shape and significantly reduce the time of research. In the case of studying InSe and GaSe crystals, spectra with signal-to-noise ratio (SNR) values of 41.9 dB were observed in samples with a volume of 0.1 cm3. As the results of the research have shown, the characteristics of the proposed spectrometer make it effective when used to observe free induction decay (FID) signals of a significant number of isotopes of elements with quadrupolar nuclei.

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Section: Ga 115 In Nqr Study Of Gase and Insementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Low-Cost Digital Pulsed Coherent Spectrometer for Investigation of NQR in Layered Semiconductor GaSe and InSe Crystals

Hotra

Samila

2020

Electronics

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“…Висоêà точíість тà іíфоðмàтивíість дàíого методу уможливлює його ефеêтивíе впðовàджеííя в ðізíі гàлузі íàуêи тà íàðодíого господàðствà: мàтеðіàлозíàвство (досліджеííя симетðії, стðуê-туðи, фàзових пеðеходів тà àíàліз дефеêтíості êðистàлів); твеðдотільíà елеêтðоíіêà (êоíтðоль стðуêтуðи íàпівпðовідíиêів пðи ствоðеííі íà їх осíові ðàдіàційíо-стійêих пðистðоїв); боðотьбà з теðоðизмом тà íàціоíàльíà безпеêà (дистàíційíе виявлеííя вибухових тà íàðêотичíих ðечовиí) тà іí. [1][2][3][4].…”

Section: апаратно-програмна реалізація системи зборó äаних äля імпóльunclassified

Hardware and software implementation of data acquisition system for pulsed NQR spectrometer

2017

Self Cite

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A hardware and software implementation of compact data acquisition system for pulsed nuclear quadrupole resonance spectrometer is proposed. The developed system is based on multi-protocol converter USB-245FIFO FT2232H, which provides data transfer speeds up to 480 Mb/s. For nuclear spin induction visualization and data signal processing using graphical tools of the object oriented programming a LabVIEW virtual instrument is synthesized. To synchronize data acquisition system with start of the exciting pulse the FPGA configuration structure is developed. The experimental results are showed possibility of the broadband nuclear quadrupole resonance spectrums imaging with frequency resolution 1.6 kHz, which confirms the high accuracy of the developed data acquisition system. Two-channel transmitter provides simultaneous operation of the two independent data channels in a single hardware USB interface. The use of the proposed data acquisition system for portable nuclear quadrupole resonance spectrometers will significantly reduce the cost of laboratory equipment for radio physical experimentation.

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“…The methods of pulsed Fourier and relaxation spectroscopy of NQR are gaining relevance for the remote detection of resonant signals of the 14 N isotope in solids (drugs and explosives in non-metallic containers) [ 1 ]. The results obtained with NQR are also unique in the study of complex multiplet spectra that are characteristic of layered semiconductors due to the polytypic modifications of their crystal structure [ 2 ]. Basic and applied research in the field of NQR spectroscopy is carried out in the following topical areas: the development of experimental methods and equipment for NQR observation; the development of hardware and software for the digital processing of spin induction signals in real time; studies of the intramolecular structure of substances and their physicochemical properties; the development of NQR detectors of explosives and drugs; NQR tomography, and the like [ 1 , 2 , 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Implementation of the Configuration Structure of an Integrated Computational Core of a Pulsed NQR Sensor Based on FPGA

Samila

Hotra

Majewski

2021

Sensors

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This paper presents a method for implementing the configuration structure of an integrated computational core of a pulsed nuclear quadrupole resonance (NQR) sensor based on a field-programmable gate array (FPGA), which comprises the following modules: a three-channel direct digital synthesizer (DDS), a pulse sequence shaper and a software-defined radio. Experimental studies carried out using the in-circuit analyzer SignalTap Logic Analyzer have confirmed the reliability of the correct and stable operation of the functional modules of the configuration structure at all stages of signal transformations, starting from the formation of the envelope of the excitation pulses and ending with the obtainment of low-frequency quadrature signals at the outlet of the compensating filters. The time and frequency dependences of the amplitude of the output signals generated using the DDS based on a 48 bit phase accumulator are investigated. This development can be used when creating pulsed coherent NQR sensors in the frequency range of 1 MHz–50 MHz.

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Prompt quality monitoring of InSe and GaSe semiconductor crystals by the nuclear quadrupole resonance technique

Cited by 7 publications

References 6 publications

A Low-Cost Digital Pulsed Coherent Spectrometer for Investigation of NQR in Layered Semiconductor GaSe and InSe Crystals

A Low-Cost Digital Pulsed Coherent Spectrometer for Investigation of NQR in Layered Semiconductor GaSe and InSe Crystals

Hardware and software implementation of data acquisition system for pulsed NQR spectrometer

Implementation of the Configuration Structure of an Integrated Computational Core of a Pulsed NQR Sensor Based on FPGA

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