The Use of Marginal Oscillator Detector with Increased Conversion Linearity for Recording Broadband Multiplet Nuclear Quadrupole Resonance Spectra

Authors A.P. Samila

Yuriy Fedkovych Chernivtsi National University, 2, Kotsiubynskyi St., 58000 Chernivtsi, Ukraine

Issue Volume 13, Year 2021, Number 5
Dates Received 21 July 2021; revised manuscript received 20 October 2021; published online 25 October 2021
Citation A.P. Samila, J. Nano- Electron. Phys. 13 No 5, 05030 (2021)
PACS Number(s) 76.60. – k, 76.60.Gv
Keywords NQR, Sensors (3) , Modulation, Layered semiconductors, Multiplet spectra.

This paper describes the features of choosing the sweep method and mode in the study of broadband multiplet nuclear quadrupole resonance (NQR) spectra using a marginal oscillator sensor with increased conversion linearity. In particular, the work of the improved sensor in the frequency sweep mode is considered when using: bipolar frequency modulation with synchronous second harmonic detection; Zeeman modulation with synchronous first harmonic detection, provided that the modulation depth is much greater than the line width; Zeeman modulation with synchronous second harmonic detection. Much attention is paid to experimental studies of the NQR spectra and the orientation dependence of the relative integral intensity of their resonance lines for three multiplet groups in the frequency range 20.4-20.7 MHz of the 3/2 ↔ 5/2 115In quadrupole junction in a semiconductor layered InSe compound grown by the Bridgeman method. It is established that to obtain the optimal signal amplitude, the shape of the modulating field must be square-rectangular. The performed NQR studies in InSe confirm the complexity of the problem of polymorphism in layered crystals, which requires further research using various experimental techniques.Key words: NQR, Sensors, Modulation, Layered semiconductors, Multiplet spectra.

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