Abstract
The behavior of a spin system disturbed by a train of closely spaced pulses can, under the proper limiting circumstances, be described in terms of a time-independent effective Hamiltonian. The necessary conditions on pulse spacing are discussed and a recipe is given for constructing the effective Hamiltonian. The method is applied to the previously employed trains of 180° or 90° pulses, obtaining the well-known limiting behavior for small pulse spacing. An analysis is given of a recently reported experiment using a train of phase-alternated 90° pulses. Two new experiments involving complex pulse sequences are proposed, one of which permits the arbitrary scaling of the effective chemical shifts in a high-resolution NMR spectrum, and the other of which annihilates dipole-dipole and quadrupole effects in solids, leaving the chemical shifts and scalar couplings.
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Dates
Type | When |
---|---|
Created | 21 years, 6 months ago (Feb. 4, 2004, 4:33 p.m.) |
Deposited | 1 year, 6 months ago (Feb. 8, 2024, 10:18 p.m.) |
Indexed | 3 weeks, 2 days ago (Aug. 6, 2025, 9 a.m.) |
Issued | 57 years, 7 months ago (Jan. 15, 1968) |
Published | 57 years, 7 months ago (Jan. 15, 1968) |
Published Print | 57 years, 7 months ago (Jan. 15, 1968) |
@article{Waugh_1968, title={Multiple-Pulse NMR Experiments}, volume={48}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1668698}, DOI={10.1063/1.1668698}, number={2}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Waugh, J. S. and Wang, C. H. and Huber, L. M. and Vold, R. L.}, year={1968}, month=jan, pages={662–670} }