nuclear magnetic resonance (NMR)
- nuclear magnetic resonance (NMR)
-
Selective
absorption of very high-frequency radio waves by certain atomic nuclei subjected to a strong stationary
magnetic field.
Nuclei that have at least one unpaired
proton or
neutron act like tiny magnets. When a strong magnetic field acts on such nuclei, it sets them into
precession. When the natural
frequency of the precessing nuclear magnets corresponds to the frequency of a weak external radio wave striking the material, energy is absorbed by the nuclei at a frequency called the resonant frequency. NMR is used to study the molecular structure of various solids and liquids.
Magnetic resonance imaging, or MRI, is a version of NMR used in medicine to view soft tissues of the human body in a hazard-free, noninvasive way.
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Universalium.
2010.
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