Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a magnetic field absorb and re-emit electromagnetic radiation. This energy is at a specific resonance frequency which depends on the strength of the magnetic field and the magnetic properties of the isotope of the atoms; in practical applications, the frequency is similar...
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selective absorption of very high-frequency radio waves by certain atomic nuclei that are subjected to an appropriately strong stationary magnetic ... [22 related articles]
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(NMR) The magnetic resonance of an atomic nucleus. All atomic nuclei, except even-even nuclei (those with an even number or protons and an even number of neutrons), have magnetic moments associated with them, which tend to be aligned by an externally applied magnetic field, but ...
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resonance spectroscopy phenomenon used for identification of atomic nuclei, utilizing the interaction between their nuclear spins, aligned by a static magnetic field, and an external radiofrequency field
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phenomenon by which atomic nuclei resonate in response to electromagnetic radiation of a particular frequency when placed in a steady magnetic field NOTE - Nuclear magnetic resonance can be used to identify unknown atoms within molecules, or to determine the concentration of a known atom.
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NMR is an analytical technique for working out what an organic compound actually is. It works by placing the sample inside a very strong magnetic field (typically around 100,000 times stronger than the earth's magnetic field, though it can be carried out with weaker and weaker fields as research continues) and playing FM radio waves at it. The stro...
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Spectroscopic method of measuring the magnetic moment of atomic nuclei in a covalent bond. Clinical application is in biochemical, metabolic, and physiologic studies of living tissue. It includes proton and electron spin-echo and spin-relaxation times. ... (12 Dec 1998) ...
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a phenomenon exhibited by many atomic nuclei: when placed in a constant magnetic field, the nuclei absorb electromagnetic radiation at a few characteristic frequencies. By applying an external magnetic field to a solution in a constant radio frequency field, it is possible to determine the structure of an unknown compound...
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Biophysical technique which allows the spectroscopy or imaging of molecules containing at least one paramagnetic atom (eg. 13C, 31P). Although non-invasive, the scale of the equipment needed to generate the radiofrequency electromagnetic and magnetic fields, and the computer power needed to analyse the results, are non-trivial. Widely used as a medical imaging technology.
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a technique for elucidating molecular structures by utilising the principle that nuclei of some isotopes behave like spinning magnets which when exposed to a particular magnetic field and electromagnetic wave length (radiowaves) can absorb energy.
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(NMR) Type: Term Definitions: 1. the phenomenon in which certain atomic nuclei possessing a magnetic moment will precess around the axis of a strong external magnetic field, the frequency of precession (Larmor frequency) being specific for each nucleus and the strength of the magnetic field; spinning nuclei induce their own oscil...
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[
n] - resonance of protons to radiation in a magnetic field
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An analytical method developed in the 1980s by Professor Gérard Martin at the University of Nantes (NMR, nuclear magnetic resonance for short) which can be used to determine the authenticity of alcoholic beverages. The method, which is recognised and patented by the EU and the OIV, determines the structure of ethanol molecules. This enables w...
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NMR noun resonance of protons to radiation in a magnetic field
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the selective absorption of electromagnetic radiation by an atomic nucleus in the presence of a strong, static, magnetic field: used in research and in medicine to monitor tissue metabolism and to distinguish between normal and abnormal cells. Cf.Abbr.: NMR
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