Abstract
The density-operator formalism is used to obtained an expression for the nuclear spin response to a general two-pulse echo sequence in a pure nuclear quadrupole resonance experiment. The derivation is for a spin- 3 2 system experiencing a non-axial electric field gradient and subjected to electric quadrupolar and magnetic dipole-dipole couplings. Explicit expressions for the spin response are given for four commonly used sequences in terms of the van Vleck moments. The analysis of bromine NQR data for PrBr 3 provides a demonstration that quadrupolar, homonuclear dipolar and heteronuclear dipolar contributions to the van Vleck moments can be separately determined by applying appropriate spin-echo sequences.
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