Solid state proton imaging detected by quadrupole resonance

A double resonance method for imaging of solid materials containing quadrup ole nuclei via the coupled protons is reported. The technique uses a static field gradient to encode the position on the protons and the method of dou ble resonance spin-echo to detect the occurrence of proton resonances by af fecting the zero-field echo signal from the quadrupole system. The double r esonance imaging method offers the advantages of higher spatial resolution and straightforward image reconstruction for powder samples compared with r otating-frame and Zeeman-perturbated nuclear quadrupole resonance encoding techniques. (C) 2001 Academic Press.