Breakdown of Carr-Purcell Meiboom-Gill spin echoes in inhomogeneous fields

被引：9
|
作者：
Jarenwattananon, Nanette N. [1 ]
Bouchard, Louis-S. [1 ]
机构：
[1] Univ Calif Los Angeles, Dept Chem & Biochem, 607 Charles E Young Dr East, Los Angeles, CA 90095 USA
来源：
JOURNAL OF CHEMICAL PHYSICS | 2018年 / 149卷 / 08期
基金：
美国国家科学基金会;
关键词：
NUCLEAR MAGNETIZATION; RESTRICTED GEOMETRY; DIFFUSION; GRADIENT; RELAXATION; DECAY; NMR;
D O I：
10.1063/1.5043495
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The Carr-Purcell Meiboom-Gill (CPMG) experiment has been used for decades to measure nuclear-spin transverse (T-2) relaxation times. In the presence of magnetic field inhomogeneities, the limit of short interpulse spacings yields the intrinsic T-2 time. Here, we show that the signal decay in such experiments exhibits fundamentally different behaviors between liquids and gases. In gases, the CPMG unexpectedly fails to eliminate the inhomogeneous broadening due to the non-Fickian nature of the motional averaging. Published by AIP Publishing.
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页数：4
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