%0 Journal Article %J Applied Physics Letters %D 1998 %T Low field magnetic resonance images of polarized noble gases obtained with a dc superconducting quantum interference device %A Augustine, M. P. %A Wong-Foy, A. %A Yarger, J. L. %A Tomaselli, M. %A Pines, A. %A TonThat, D. M. %A Clarke, J. %K mri %X

Using a low transition temperature superconducting quantum interference device as a detector, we have obtained magnetic resonance images of laser-polarized He-3 gas and solid Xe-129 at 4.2 K in magnetic fields as low as 0.54 mT (He-3) and 1 mT (Xe-129), corresponding to Larmor frequencies of 17.6 and 11.8 kHz, respectively. The experimental resolution of the images is similar to 500 mu m for He-3 ill the gas phase and similar to 950 mu m for Xe-129 in the solid state. (C) 1998 American Institute of Physics.

%B Applied Physics Letters %V 72 %P 1908-1910 %8 Apr 13 %@ 0003-6951 %G English %U ://WOS:000073054300038 %N 15 %M WOS:000073054300038 %! Low field magnetic resonance images of polarized noble gases obtained with a dc superconducting quantum interference device %R Doi 10.1063/1.121223 %0 Journal Article %J Review of Scientific Instruments %D 1997 %T Low magnetic field dynamic nuclear polarization using a single-coil two-channel probe %A TonThat, D. M. %A Augustine, M. P. %A Pines, A. %A Clarke, J. %K nmr %X

We describe the design and construction of a single-coil, two-channel probe for the detection of low-field magnetic resonance using dynamic nuclear polarization (DNP). The high-frequency channel of the probe, which is used to saturate the electron spins, is tuned to the electron Larmor frequency, 75 MHz at 2.7 mT, and matched to 50 Omega. Low-field, H-1 nuclear magnetic resonance (NMR) is detected through the second, low-frequency channel at frequencies <1 MHz. The performance of the probe was tested by measuring the DNP of protons in a manganese (II) chloride solution at 2.7 mT. At the proton NMR frequency of 120 kHz, the signal amplitude was enhanced over the value without DNP by a factor of about 200. (C) 1997 American Institute of Physics.

%B Review of Scientific Instruments %V 68 %P 1527-1531 %8 Mar %@ 0034-6748 %G English %U ://WOS:A1997WP24700033 %N 3 %M WOS:A1997WP24700033 %! Low magnetic field dynamic nuclear polarization using a single-coil two-channel probe %R Doi 10.1063/1.1147641