Ultra-high field

We have referred to the various interactions which can cause line broadening in the solid state. One of these, which is normally not a problem in liquid state NMR, is due to the fact that the chemical shift itself is a tensor, i.e. in a coordinate system with orthogonal axes x, y and z its values along these axes can be very different. This anisotropy of the chemical shift is proportional to the magnetic field of the spectrometer (one reason why ultra-high field spectrometers are not so useful), and can lead in solid state spectra to the presence of a series of spinning sidebands, as shown in the spectra of solid polycrystalline powdered triphenylphosphine which follows (Fig. 49). In the absence of spinning, the linewidth of this sample would be around 75 ppm ... 

Fig. 8 13C and 29Si MAS-NMR of two SiC polytypes. Left panel-, see text for assignments. Right panel-. Experimental and calculated ultra-slow MAS-NMR spectra at ultra-high field of 21.1 T. Modified and reprinted with permission from [133]. Copyright 2009 by the American Chemical Society... 

P. J. Pallister, I. L. Moudrakovski and J. A. Ripmeester, Mg-25 ultra-high field solid state NMR spectroscopy and first principles calculations of magnesium compounds. Phys. Chem. Chem. Phys., 2009,11,11487-11500. 

K. Shimoda, Y. Tobu, M. Hatakeyama, T. Nemoto and K. Saito, Structural investigation of Mg local environments in silicate glasses by ultra-high field Mg 3QMAS NMR spectroscopy. Am. Mineral, 2007, 92, 695-698. 

Robitaille PM, Berliner L. Ultra high field magnetic resonance imaging. Biological Magnetic Resonance 2006 26. 

Verhoeven MA, Creemers AFL, Bovee-Geurts PHM et al (2001) Ultra-high-field MAS NMR assay of a multispin labeled ligand bound to its G-protein receptor target in the natural membrane environment electronic stmcture of the retinylidene chromophore in rhodopsin. Biochemistry (Mosc) 40 3282-3288... 

Brown, L.J. Toutoungi, D.E. Devenport, N.A. Reynolds, J.C. Kaur-Atwal, G. Boyle, R, Creaser CS., Miniaturized ultra high field asymmetric waveform ion mobility spectrometry combined with mass spectrometry for peptide analysis. Anal. Chem. 2010, 82(23), 9827-9834. 

Wdks, A., A Consideration of Ion Chemistry Encountered on the Microsecond Separation Timescales of Ultra-High Field Ion Mobility Spectrometry, 20th annual conference. International Society for Ion Mobility Spectrometry, Edinburgh, Scotland, July 23-28, 2011. 

Mohammad, A., Boyle, B., Rush, M., Koehl, A., Lamb, K., Ultra high-field FAIMS beyond air breakdown. Proceedings of the 59th Pittcon Conference, New Orleans, LA (03/2008). 

Kennedy, G.J., Afeworki, M., and Hong, S.B. 2002. Probing the non-random aluminum distribution in zeolite merlinoite with ultra-high-field (18.8 T) A1 and Si MAS NMR. Micropor. Mesopor. Mater. 52 55-59. 

M. Yagi-Utsumi and K Kato, A Systematic Approach to Structural Glyco-biology by Using Ultra-High Field NMR Spectroscopy and Multidimensional HPLC , Kagaku to Seibutsu, 2009, 47, 261. 

Ultra High Field Magnetic Resonance Imaging A Historical Perspective... 

Design Considerations for Ultra High Field MRI Magnet Systems... 

Ultra High Field MRI High-Frequency Coils... 

Clinical Promise Clinical Imaging at Ultra High Field... 

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