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| Journal Article | PreJuSER-61830 |
; ; ; ; ;
2008
Elsevier
Amsterdam [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.jmr.2008.01.004
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 approximately 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.
Keyword(s): Equipment Design (MeSH) ; Equipment Failure Analysis (MeSH) ; Magnetic Resonance Spectroscopy: instrumentation (MeSH) ; Magnetic Resonance Spectroscopy: methods (MeSH) ; Microwaves (MeSH) ; Reproducibility of Results (MeSH) ; Sensitivity and Specificity (MeSH) ; J ; dynamic nuclear polarization (auto) ; X-band DNP (auto) ; Overhauser effect (auto) ; portable DNP (auto)
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