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Laser-polarized (129)Xe NMR and MRI at ultralow magnetic fields
Annjoe Wong-Foy1, Sunil Saxena, Adam J Moulé
1Department of Chemistry, University of California, Berkeley, and Materials Sciences Division, Lawrence Berkeley National Laboratory, 94720, USA. wongfoy@lucent.com
Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 27, 2002
Abstract:
Laser-polarized (129)Xe and a high-T(c)superconducting quantum interference device (SQUID) are used to obtain magnetic resonance images in porous materials at a magnetic field of 2.3 mT, corresponding to a Larmor frequency of 27 kHz. Image resolution of 1 mm is obtained with gradients of only 1 mT/m. The resolution of xenon chemical shifts in different physicochemical environments at ultralow fields is also demonstrated. Details of the circulating flow optical pumping apparatus and the SQUID spectrometer are presented.