Dictionary A chemical-shift reference is used to define the (CH3)4SI positions of the resonances in the spectrum in terms of parts-per-million, or ppm, of frequency It is a material which is often directly added to the

4.1 NMR HARDWARE Hardware overview Magnet Field lock Shim Coils Sample probe RF CoIls Gradient coils Qadrature Detector Digital Filtering

3. 1 Chemical shift When an atom is placed in a magnetic field B its electrons circulate about the direction of the applied magnetic field. This circulation causes a small magnetic field at the nucleus which opposes the externally applied field The magnetic field at the nucleus(the effective field) is therefore generally less than the applied field by a fraction THNMR

What is nmr? g NMR, Nuclear Magnetic Resonance, is a phenomenon which occurs when the nuclei of certain atoms are immersed in a static magnetic field and exposed to a second oscillating magnetic field

A remarkab|efie|d e One of the two leading technologies in structural biolog y Great contributions to biology A special window to the development of modern structural biology and biophysics THNMR YAN

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