Cross-Relaxation Enhanced NQR of Ammonium Nitrate in Low Magnetic Field
Nuclear quadrupole resonance (NQR) with use of pulses of low magnetic field has been studied. The technique is based on the matching of proton frequency (ν L) to one of the NQR frequencies (ν 0, ν + or ν −) for the period of application of pulse magnetic field. Theoretical approach to analyse the NQR experiments in pulse magnetic fields is outlined. In this work the NQR on ammonium nitrate (AN) sample for specific case of ν L = ν 0 have been studied. It has been shown that the technique provides essential shortening the effective spin-lattice relaxation time and can be applied for the detection of explosive materials.
KeywordsAmmonium Nitrate Static Magnetic Field Nuclear Quadrupole Resonance Pulse Magnetic Field Helmholtz Coil
This work was supported by NATO Science for Peace and Security Programme under Science for Peace project No. 982836, and by the TÜBİTAK/RFBR joint project programme, grant No. 212T131/13-03-91372_CT_a. Authors also acknowledge the referees of this paper for their very valuable suggestions and comments.
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