Nonlinear Effects from Dipolar Interactions in Hyperpolarized Liquid [Formula presented]

M. P. Ledbetter; M. V. Romalis

doi:10.1103/PhysRevLett.89.287601

Nonlinear Effects from Dipolar Interactions in Hyperpolarized Liquid [Formula presented]

M. P. Ledbetter, M. V. Romalis

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Abstract

We investigate nonlinear effects of long-range dipolar interactions in a spherical sample of hyperpolarized liquid [Formula presented]. Using two high-[Formula presented] 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 [Formula presented] 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.

Original language	English (US)
Journal	Physical review letters
Volume	89
Issue number	28
DOIs	https://doi.org/10.1103/PhysRevLett.89.287601
State	Published - 2002

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.89.287601

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title = "Nonlinear Effects from Dipolar Interactions in Hyperpolarized Liquid [Formula presented] ",

abstract = "We investigate nonlinear effects of long-range dipolar interactions in a spherical sample of hyperpolarized liquid [Formula presented]. Using two high-[Formula presented] 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 [Formula presented] 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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AU - Romalis, M. V.

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N2 - We investigate nonlinear effects of long-range dipolar interactions in a spherical sample of hyperpolarized liquid [Formula presented]. Using two high-[Formula presented] 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 [Formula presented] 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.

AB - We investigate nonlinear effects of long-range dipolar interactions in a spherical sample of hyperpolarized liquid [Formula presented]. Using two high-[Formula presented] 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 [Formula presented] 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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VL - 89

JO - Physical review letters

JF - Physical review letters

IS - 28

ER -

Nonlinear Effects from Dipolar Interactions in Hyperpolarized Liquid [Formula presented]

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