Generating unexpected spin echoes in dipolar solids with π pulses

被引：34

作者：

Li, Dale ^{[1
]}

Dementyev, A. E. ^{[1
]}

Dong, Yanqun ^{[1
]}

Ramos, R. G. ^{[1
]}

Barrett, S. E. ^{[1
]}

机构：

[1] Yale Univ, Dept Phys, New Haven, CT 06511 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.98.190401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

NMR spin echo measurements of C-13 in C-60, Y-89 in Y2O3, and Si-29 in silicon are shown to defy conventional expectations when more than one pi pulse is used. Multiple pi-pulse echo trains may either freeze out 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.

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页数：4

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