Nonlinear effects from dipolar interactions in hyperpolarized liquid 129Xe -: art. no. 287601

被引：25

作者：

Ledbetter, MP ^{[1
]}

Romalis, MV ^{[1
]}

机构：

[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 28期

关键词：

D O I：

10.1103/PhysRevLett.89.287601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate nonlinear effects of long-range dipolar interactions in a spherical sample of hyperpolarized liquid Xe-129. Using two high-T-c SQUID detectors we directly measure the evolution of the magnetization gradients. For small initial rf tip angles we observe an increase in the transverse relaxation time T-2* by a factor of 5 and coherent oscillations of magnetization gradients. For large tip angles we observe an exponential growth of the magnetization gradients and demonstrate a gain in sensitivity to magnetic field gradients by a factor of 10. Our results are in quantitative agreement with simple analytical predictions. We discuss applications of these nonlinear effects for precision measurements.

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