Dynamic nuclear polarization experiments at 14.1 T for solid-state NMR
Literature Information
Yoh Matsuki, Hiroki Takahashi, Keisuke Ueda, Toshitaka Idehara, Isamu Ogawa, Mitsuru Toda, Hideo Akutsu, Toshimichi Fujiwara
Instrumentation for high-field dynamic nuclear polarization (DNP) at 14.1 T was developed to enhance the nuclear polarization for NMR of solids. The gyrotron generated 394.5 GHz submillimeter (sub-mm) wave with a power of 40 W in the second harmonic TE0,6 mode. The sub-mm wave with a power of 0.5–3 W was transmitted to the sample in a low-temperature DNP-NMR probe with a smooth-wall circular waveguide system. The 1H polarization enhancement factor of up to about 10 was observed for a 13C-labeled compound with nitroxyl biradical TOTAPOL. The DNP enhancement was confirmed by the static magnetic field dependence of the NMR signal amplitude at 90 K. Improvements of the high-field DNP experiments are discussed.
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