Resonator with reduced sample heating and increased homogeneity for solid-state NMR

In the application of solid-state NMR to many systems, the presence of radiofrequency (rf) electric fields inside classical solenoidal coils causes heating of lossy samples. in particular, this is critical for proteins in ionic buffers. Rf sample heating increases proportional to frequency which may result in the need to reduce the rf pulse power to prevent partial or total sample deterioration. In the present paper, we propose a multifrequency-tunable NMR resonator where the sample is electrically shielded from the NMR coil by a conductive sheet that increases the magneto-electric ratio. Expressions for the B-1 efficiency as function of magnetic and electric filling factors are derived that allow a direct comparison of different resonators. Rf efficiency, homogeneity, signal-to-noise, and rf sample heating are compared. NMR spectra at 700 MHz on ethylene glycol, glycine, and a model protein were acquired to compare the resonators under realistic experimental conditions. (C) 2007 Elsevier Inc. All rights reserved.


Published in:
Journal of Magnetic Resonance, 191, 1, 78-92
Year:
2008
Publisher:
ACADEMIC PRESS INC ELSEVIER SCIENCE
ISSN:
1090-7807
Keywords:
Laboratories:




 Record created 2015-01-08, last modified 2018-03-17


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)