Abstract
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.
Highlights
The method of nuclear quadrupole resonance (NQR) is based on the absorption of high-frequency energy by changing the orientation of the quadrupole moments of atomic nuclei in a non-uniform electric field created by external charges relative to the nucleus
The levels of quadrupole energy in a solid substance arise when quadrupole moments interact with a non-uniform electric field at the location of the resonating nucleus, the NQR spectrum reflects the distribution of electron density near a certain atom
The studychain of the the degree of suppression suppression of the the carrier oscillation and the theAfrequency frequency response of analog signal based on the gated amplifier was carried out as follows
Summary
The method of nuclear quadrupole resonance (NQR) is based on the absorption of high-frequency energy by changing the orientation of the quadrupole moments of atomic nuclei in a non-uniform electric field created by external charges relative to the nucleus. NQR spectroscopy is used to study solids with the width of individual lines of the resonance. NQR spectroscopy is used to study solids with the width of individual lines of the resonance spectrum, typically 1–10 kHz or more [5]. That is why this method is most suitable for the study of spectrum, typically 1–10 kHz or more [5]. A method of increasing the accuracy of the reproduction of the reproduction of the shape of broadband NQR spectra by suppressing up to 100 dB of the transient shape of broadband NQR spectra by suppressing up to 100 dB of the transient process in the receiving coil process in the receiving coil of the input device of the spectrometer is proposed.
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