Journal
CHEMPHYSCHEM
Volume 9, Issue 10, Pages 1395-1401Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200800113
Keywords
magnetic properties; masers; NMR spectroscopy; spin dynamics; xenon
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We report a new phenomenon observed when the magnetization of dissolved hyperpolarized Xe-129 is intense and opposite to the Boltzmann magnetization. Without radio-frequency (rf) excitation, the system spontaneously emits a series of rf bursts characterized by very narrow bandwidths (0.03 Hz at 138 MHz). This chaotic NMR-maser illustrates the increase in the complexity of spin dynamics at high magnetization levels by unveiling an inhomogeneous spatial organization of the xenon magnetization and an apparent dependence of the xenon transverse relaxation time on its polarization and/or on time.
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