Abstract
Multipole NMR is used to calculate the responses during various pulse sequences for a solid system of spin- 1 2 nuclei subject to a strong do magnetic field and an inhomogeneous distribution of quadrupole and dipole-dipole interactions. The following sequences were treated: 90° X−τ 1, 90° X−τ 1−90° X−τ 2 90° X−τ 1−90° Y−τ 2, 90° X−τ 1−90° X−τ 2−90° X−τ 3 , 90° X−τ 1−90° Y−τ 2−90° Y−τ 3, and 90° X−τ 1−45° Y−τ 2−45° Y−τ 3 . The calculations show that all of the 15 multipole polarizations (3 alignments, 6 single-, 4 double-, and 2 triple-quantum coherences) can be created in significant amounts by appropriate sequences. The calculations for each sequence have been verified by a detailed experimental study of the sequence responses for Br in a deformed single-crystal of KBr. Seven independent relaxation times were determined. The experiments provide the first evidence for octupole alignment in spin systems.
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