NMR_Inst_2010 - NMR Instrumentation BCMB/CHEM 8190 Biomolecular NMR Instrumental Considerations Block Diagram of an NMR Spectrometer B Magnet Probe

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Unformatted text preview: NMR Instrumentation BCMB/CHEM 8190 Biomolecular NMR Instrumental Considerations - Block Diagram of an NMR Spectrometer B Magnet Probe Lock Receiver Transmit Computer Sample Modern NMR Magnets are Super Conducting Solenoids • Materials: NbTi < 10T, NbSn > 10T • Max Field (2000): 23.5 T (900 MHz) • Advantages: high field, stability, homogeneity > 1 : 10 9 B i Shim Coils B Z Inherent field profile B (z) = B + a1 z + a2 z 2 + …. Design coils to produce –a1 z, -a2 z 2 , etc ai are set by adjusting current in each of 16-40 coil sets – x, y, z, powers and cross terms i i z a linear z coil Room Temperature Shim Assemblies From Modern NMR Techniques for Chemistry Research , Andrew E. Derome Shimming Origin: old electromagnets used shims under pole pieces Interactive shimming B Z ν Auto shim: - based on amplitude of lock signal Gradient shim: observing effect of imposed field gradient – can deconvolute field inhomogeniety Adjust z 2 A Deuterium Lock Stabilizes the Field X axis (absorptive)...
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This note was uploaded on 11/07/2011 for the course CHEM 8853R taught by Professor Gelbaum during the Fall '11 term at Georgia Institute of Technology.

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NMR_Inst_2010 - NMR Instrumentation BCMB/CHEM 8190 Biomolecular NMR Instrumental Considerations Block Diagram of an NMR Spectrometer B Magnet Probe

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