Abstract
Instrumentation for high-field dynamic-nuclear polarization (DNP) was developed to enhance the sensitivity of nuclear magnetic resonance of biological solids at high magnetic fields. A newly designed gyrotron generated 394.5-GHz submillimeter wave with 40 W at the second harmonics operation. The DNP at 14.1 T was confirmed by the field dependence of <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">13</sup> C-NMR signal amplitudes of samples at 100 K.
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