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03 January 2025

» arxiv » arxiv.0705.0620

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Generating Unexpected Spin Echoes in Dipolar Solids with Pi Pulses
Dale Li ; A. E. Dementyev ; Yanqun Dong ; R. G. Ramos ; S. E. Barrett ;
Date:	4 May 2007
Subject:	Quantum Physics (quant-ph)
Abstract:	NMR spin echo measurements of C-13 in C60, Y-89 in Y2O3, and Si-29 in silicon are shown to defy conventional expectations when more that one pi pulse is used. Multiple pi-pulse echo trains may either freeze our or accelerate the decay of the signal, depending on the pi-pulse phase. Average Hamiltonian theory, combined with exact quantum calculations, reveals an intrinsic cause for these coherent phenomena: the dipolar coupling has a many-body effect during any real, finite pulse.
Source:	arXiv, arxiv.0705.0620
Other sources:	[GID 580271] arxiv.0705.0667 pmid17677606
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