Physical Instruments for Ecology, Medicine, and Biology

Instruments and Experimental Techniques

, Volume 53, Issue 2, pp 284-287

First online:

A pulse nuclear quadrupole resonance spectrometer

  • V. V. BrailovskiiAffiliated withJurij Fed’kovych Chernivtsi National University Email author 

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A pulse nuclear quadrupole resonance (NQR) spectrometer intended for studying the resonance signal spectra of nuclei of solid substances in a 1- to 30-MHz band is described. The pulse duration of excitation pulses is regulated from 10 to 100 μs at a 5- to 100-Hz pulse repetition rate. The spectrometer ensures a probing pulse power of up to 1.5 kW and is characterized by the availability of an NQR signal simulator, a low-noise preamplifier, and a phase detector with a dynamic range exceeding 100 dB. The efficiency of the spectrometer has been tested by studying the NQR spectrum of 14N nuclei in urotropine. The spectrometer ensured a possibility of detecting 0.2 g of urotropine.