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Evaluation of Moments from the NMR Solid Echoes in Dipolar Solids
Author(s) -
Kahol P. K.
Publication year - 1990
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221590235
Subject(s) - spins , dipole , pulse sequence , free induction decay , spin echo , pulse (music) , nuclear magnetic resonance , echo (communications protocol) , solid state nuclear magnetic resonance , simple (philosophy) , resonance (particle physics) , physics , computational physics , chemistry , materials science , molecular physics , atomic physics , condensed matter physics , magnetic resonance imaging , computer science , quantum mechanics , medicine , computer network , philosophy , voltage , epistemology , radiology
Two‐pulse‐solid echo, formed by the pulse sequence P y (90°)‐τ‐ P x (90°)‐ t ′, can be used as an alternative to the free‐induction‐decay to evaluate the lower order moments of the magnetic resonance lineshape in “molecular” solids, provided τ is small. The applicability of this method in determining the lower moments depends not only on the value of τ and hence the so‐called “error terms” but also on the distributional arrangement of the spins. These aspects of the solid echo method are quantified in this paper from the analytical treatment of a rectangular array of two equivalent pairs of spins‐1/2. Predictions of the rather simple model, when compared with the appropriate experimental data, are found to be in excellent agreement.