Abstract
In nuclear quadrupole resonance, splitting of energy levels of a spin system occurs under the influence of the interaction between the nuclear quadrupole moment and intracrystalline electric field gradients. That allows us to observe NMR signals in zero or weak static magnetic field. The absence of electromagnets essentially decreases the necessary instrument set that is a great advantage of this method over NMR.
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Notes
- 1.
When recording NQR signals by pulse methods it is very difficult to obtain an undistorted signal shape.
- 2.
A. Lösche. Kerninduktion. Deutscher Verlag d. Wissenschaften, 1957
- 3.
During the radiofrequency pulse relaxation processes can be neglected if their duration is much less than the spin-spin and spin-lattice relaxation times, however, they should be taking account between the pulses. Nevertheless, firstly one carries out calculations without any relaxation effects, and after that one can take into account their influence phenomenologically.
- 4.
For the spin number equal to 1 such operators do not exist.
- 5.
V. S. Grechishkin, N. Ya. Sinyavskii. New technologies: nuclear quadrupole resonance as an explosive and narcotic detection technique. Phys. Usp. 40 (1997) 393.
Further Readings
Das TP, Hahn EL (1958) Nuclear quadrupole resonance spectroscopy. Academic Press, New York
Fraissard J, Lapina O (2009) Explosives detection using magnetic and nuclear resonance techniques, Wiley, New York (ISBN 978-9048130610)
Miller JB (2007) Nuclear quadrupole resonance detection of explosives, in Counterterrorist detection techniques of explosives. In: Yinon J (ed) Elsevier, Amsterdam, pp 131–156.
Parish RV (1990) NMR, NQR, EPR, and Mossbauer spectroscopy in inorganic chemistry. Ellis Horwood, New York
Rudakov TN (2009) Detection of explosives by NQR methods: main aspects for transport security. In: Fraissard J, Lapina O (eds) Explosives detection using magnetic and nuclear resonance techniques. NATO Science for Peace and Security Series, Springer, New York, p 111
Smith JAS (ed) (1983) Advances in nuclear quadrupole resonance, vol 5. Heyden, London
Weiss A (1972) Nuclear quadrupole resonance. In: Topics in current chemistry, vol 30. Springer, Berlin.
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Chizhik, V.I., Chernyshev, Y.S., Donets, A.V., Frolov, V.V., Komolkin, A.V., Shelyapina, M.G. (2014). Experimental Methods in NQR. In: Magnetic Resonance and Its Applications. Springer, Cham. https://doi.org/10.1007/978-3-319-05299-1_9
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DOI: https://doi.org/10.1007/978-3-319-05299-1_9
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