The detection of nuclear quadrupole resonance

As we have seen, NQR transitions can occur over a very wide frequency range. Those of lowest energy, arising for example from the deuteron ( 100 kHz), are not usually observed directly but may be detected by the quadrupole structure in NMR and this phenomenon has been discussed in Chapter 1. For transition frequencies a little higher 

All these spectrometers are suitable for spectral scanning and searching for resonances of unknown frequency. If the frequency is known then pulse techniques, similar to those used in NMR, may be employed [19]. These give accurate line-shapes and, as for NMR, can be used also to measure relaxation times. 

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