Dynamic nuclear polarization experiments at 14.1 T for solid-state NMR.
 

Dynamic nuclear polarization experiments at 14.1 T for solid-state NMR.

Related Articles Dynamic nuclear polarization experiments at 14.1 T for solid-state NMR.

Phys Chem Chem Phys. 2010 Jun 14;12(22):5799-803

Authors: Matsuki Y, Takahashi H, Ueda K, Idehara T, Ogawa I, Toda M, Akutsu H, Fujiwara T

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.

PMID: 20518128 [PubMed - indexed for MEDLINE]



Source: PubMed