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

M. P. Ledbetter, M. V. Romalis

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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 languageEnglish (US)
JournalPhysical review letters
Issue number28
StatePublished - 2002

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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