JAMES HOLMES / CELLTECH / SCIENCE PHOTO LIBRARY JAMES HOLMES / CELLTECH / SCIENCE PHOTO LIBRARY
Nuclear Magnetic Resonance (NMR) chemical spectroscopy: NMR spectrum or fingerprint of a carboxylic acid. The applications of NMR in chemical analysis or imaging the body depend on nuclei having the nuclear property of "spin", the ability to generate a small magnetic field. When placed within a strong magnetic field, such nuclei wobble (precess) at a particular frequency, which varies according to environment. This is exploited in analytical chemistry, where protons in different groups display differing precession frequencies & show characteristic chemical "shifts" in the NMR spectrum.
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