Dynamic nuclear polarization experiments at 14.1 T for solid-state NMR.
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 TE(0,6) 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 (1)H polarization enhancement factor of up to about 10 was observed for a (13)C-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.
Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
Yoh
Y
Matsuki
Hiroki
H
Takahashi
Keisuke
K
Ueda
Toshitaka
T
Idehara
Isamu
I
Ogawa
Mitsuru
M
Toda
Hideo
H
Akutsu
Toshimichi
T
Fujiwara
D002247:Carbon Isotopes / Q000737:chemistry; D003497:Cyclic N-Oxides / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation / Q000379:methods*; D020005:Propanols / Q000737:chemistry; D013696:Temperature
C521769:1-(TEMPO-4-oxy)-3-(TEMPO-4-amino)propan-2-ol; D002247:Carbon Isotopes; D003497:Cyclic N-Oxides; D020005:Propanols