Abstract

Double resonance with coupled multiplets is a very high sensitivity technique for measuring the NQR spectra of nuclei with half integer ( I 1 2 ) spins. The spectra of naturally abundant (0.037%) 17O are detected with ease. The spectra reveal fine structure which enhances the NQR technique as a probe of electronic structure. The theory of DRCM is given and its application in practice is discussed with examples. The effect of spin-lattice relaxation of the quadrupolar nuclei is described.

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