Nuclear Magnetic Resonance Spectroscopy

General Information

 * NMR is a tool for determining the structure of organic compounds. Large amounts of sample are needed, however, NMR is not destructive and samples of less than a milligram are suficient.
 * NMR works because nuclei have spins associated with them, or no spin at all.
 * A spinning charge creates a magnetic field, and in the presence of an external magnetic field, it is possible to measure minute changes.
 * Therefore a spectrum is obtained by varying a magnetic field over a small range while observing the radio frequency radiation of the sample.

http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/nmr/nmr1.htm