Nuclear resonance (NMR) may be a technique of physical observation within which nuclei in a strong constant magnetic flux are discomposed by a weak periodical magnetic flux (in the close to field and thus not involving magnetic force waves) and respond by manufacturing an magnetic force signal with a frequency characteristic of the magnetic flux at the nucleus. This method happens close to resonance, once the oscillation frequency matches the intrinsic frequency of the nuclei, that depends on the strength of the static magnetic flux, the chemical setting, and therefore the magnetic properties of the atom involved; in sensible applications with static magnetic fields up to ca. 20 tesla, the frequency is analogous to VHF and UHF Television broadcasts (60–1000 MHz). Proton magnetic resonance results from specific magnetic properties of sure atomic nuclei. Nuclear resonance spectrometry is wide accustomed verify the structure of organic molecules in answer and study molecular physics, crystals further as non-crystalline materials. Proton magnetic resonance is additionally habitually utilized in advanced medical imaging techniques, like in resonance imaging (MRI). All isotopes that contain an odd range of protons and/or neutrons (see Isotope) have an intrinsic nuclear moment of a magnet and momentum, in different words a nonzero nuclear spin, whereas all nuclides with even numbers of each have a complete spin of zero.

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