期刊
JOURNAL OF MAGNETIC RESONANCE
卷 302, 期 -, 页码 43-49出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2019.03.009
关键词
Dynamic nuclear polarization; DNP; Sub-THz microwave fields; Simulation of electromagnetic fields; Nuclear magnetic resonance; Solid-state NMR instrumentation; Magic angle spinning
资金
- European Commission within the Eurostars Program [E! 9647-DNP-HOPE]
We consider the geometry of a radially irradiated microwave beam in MAS DNP NMR probes and its impact on DNP enhancement. Two related characteristic features are found to be relevant: (i) the focus of the microwave beam on the DNP MAS sample and (ii) the microwave magnetic field magnitude in the sample. We present a waveguide coupler setup that enables us to significantly improve beam focus and field magnitude in 1.3 mm MAS DNP probes at a microwave frequency of 263 GHz, which results in an increase of the DNP enhancement by a factor of 2 compared to previous standard hardware setups. We discuss the implications of improved coupling and its potential to enable cutting-edge applications, such as pulsed high-field DNP and the use of low-power solid-state microwave sources. (C) 2019 Elsevier Inc. All rights reserved.
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