MULTIPLE-QUANTUM NMR SPIN DYNAMICS IN ONE-DIMENSIONAL QUANTUM SPIN CHAINS

Multiple quantum NMR spin dynamics arising from a two-quantum/two-spin non-secular average dipolar Hamiltonian are solved exactly for an inf inite one-dimensional (1-D) quantum spin 1/2 chain with nearest-neighb or dipole-dipole interactions and initially at thermal equilibrium in a Zeeman field. Using fermion field-theoretic representations of spin 1/2 operators, the calculations yield analytical expressions valid for all times for the spin density operator, multiple quantum NMR spectra l intensities, and multiple spin correlations. implications and perspe ctives for multiple quantum NMR of materials with 1-D distributions of spins are briefly discussed.