Nuclear Quadrupole Resonance Spectroscopy

Monea, Cristian; Bizon, Nicu

doi:10.1007/978-3-030-87861-0_3

Cited by 3 publications

(1 citation statement)

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“…A diamond RF magnetometer with femtotesla sensitivity may find immediate application as a noninductive detector for nuclear quadrupole resonance (NQR) spectroscopy (24)(25)(26). NQR spectroscopy is a solid-state analysis technique that provides a unique chemical fingerprint based on the coupling of nuclear quadrupole moments to their local electric field gradients (27,28). NQR spectroscopy is used to identify powder substances in ambient conditions for security (29)(30)(31) and pharmaceutical (32)(33)(34) applications and to study the temperature-dependent properties of single-crystal materials (35)(36)(37)(38)(39).…”

Section: Introductionmentioning

confidence: 99%

Nuclear quadrupole resonance spectroscopy with a femtotesla diamond magnetometer

et al. 2023

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Radio frequency (RF) magnetometers based on nitrogen vacancy centers in diamond are predicted to offer femtotesla sensitivity, but previous experiments were limited to the picotesla level. We demonstrate a femtotesla RF magnetometer using a diamond membrane inserted between ferrite flux concentrators. The device provides ~300-fold amplitude enhancement for RF magnetic fields from 70 kHz to 3.6 MHz, and the sensitivity reaches ~70 fT√s at 0.35 MHz. The sensor detected the 3.6-MHz nuclear quadrupole resonance (NQR) of room-temperature sodium nitrite powder. The sensor’s recovery time after an RF pulse is ~35 μs, limited by the excitation coil’s ring-down time. The sodium-nitrite NQR frequency shifts with temperature as −1.00±0.02 kHz/K, the magnetization dephasing time is T 2 *=887±51 μs, and multipulse sequences extend the signal lifetime to 332±23 ms, all consistent with coil-based studies. Our results expand the sensitivity frontier of diamond magnetometers to the femtotesla range, with potential applications in security, medical imaging, and materials science.

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