Portable X-Band System for Solution State Dynamic Nuclear Polarization

SMC Author

Mark Lingwood

SMC Affiliated Work

1

Status

Faculty

School

School of Science

Department

Chemistry

Document Type

Article

Publication Date

4-2008

Publication / Conference / Sponsorship

Journal of Magnetic Resonance

Description/Abstract

This paper concerns instrumental approaches to obtain large dynamic nuclear polarization (DNP) enhancements in a completely portable system. We show that at fields of 0.35 T under ambient conditions and at X-band frequencies, 1H enhancements of >100-fold can be achieved using nitroxide radical systems, which is near the theoretical maximum for 1H polarization using the Overhauser effect at this field. These large enhancements were obtained using a custom built microwave transmitter and a commercial TE102 X-band resonant cavity. The custom built microwave transmitter is compact, so when combined with a permanent magnet it is readily transportable. Our commercial X-band resonator was modified to be tunable over a range of ∼9.5–10 GHz, giving added versatility to our fixed field portable DNP system. In addition, a field adjustable Halbach permanent magnet has also been employed as another means for matching the electron spin resonance condition. Both portable setups provide large signal enhancements and with improvements in design and engineering, greater than 100-fold 1H enhancements are feasible.

Keywords

Dynamic nuclear polarization, X-Band DNP, Overhauser effect, Portable DNP

Scholarly

yes

DOI

10.1016/j.jmr.2008.01.004

Volume

191

Issue

2

First Page

273

Last Page

281

Disciplines

Chemistry

Original Citation

Armstrong BD, Lingwood MD, McCarney ER, Brown ER, Blümler P, Han S. 2008. Portable X- band system for solution state dynamic nuclear polarization. Journal of Magnetic Resonance. 191: 273–281. https://doi.org/10.1016/j.jmr.2008.01.004

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