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nuclear quadrupole resonance (NQR) spectroscopy

A chemical detection technique used to measure molecules that have a magnetic dipole moment. The analysis is directed to nucleuses which have a quadrupole moment which leads to an asymmetric electric charge distribution. The applied electric field, by frequency of radio waves, is directed into the atomic dipoles. The incident energy is to balance the fields between nuclei and electrons such that as the distribution returns to its natural state a spectrum is released. Analysis of the spectrum provides information for the determination of the particular chemical substance. NQR is applied to the detection of explosives and landmines such as TNT and RDX.
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