nuclear magnetic resonance

Nuclear magnetic resonance (NMR) is a powerful technique which allows the study of the magnetic properties of an atom's nucleus . It involves placing nuclei within an external magnetic field enabling thus them to undergo precession . The 'resonance' part of the names implies the fact that a second (usually perpendicular) radiofrequency pulse tuned to the precessional frequency of target nuclei allows them to absorb and then emit electromagnetic energy .

Nuclear magnetic resonance is exploited in a number disciplines and fields, including magnetic resonance imaging, molecular physics and chemistry.  An offshoot of this technique, nuclear magnetic resonance spectroscopy allows precise analysis of molecular constitution of a chemical microenvironment .

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