Quadrupole-echo techniques in multiple-quantum-filtered NMR spectroscopy of heterogeneous systems

摘要: Abstract Multiple-quantum-filtered quadrupole-echo pulse sequences for spin I = 1 and 3 2 are suggested. A general condition obtaining simultaneously Zeeman quadrupolar echo is formulated. theoretical analysis of the various was performed on basis second-order perturbation approximation Liouville equation density matrix. The extent refocusing as a function ratio residual interaction relaxation rates calculated. Experimental results presented 2H 23Na in cartilage an example heterogeneous system with interaction. difference between times measured by multiple-quantum-filtered techniques those conventional NMR spectroscopy simple diagnostic anisotropic motion that leads to experiments compared computed lineshape double-quantum-filtered spectra system.