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In physics, the magnetogyric ratio (also called the gyromagnetic ratio or the Landé g-factor) is a dimensionless unit which expresses the ratio of the magnetic dipole moment to the angular momentum of an elementary particle or atomic nucleus. The magnetogyric ratio of the electron has been measured to extremely high precision, and is one of the most accurately measured physical constants. A modern experimental value is 2.002 319 304 376 8(86), with the first twelve figures certain. The magnetogyric ratio of the muon has also been measured with a good precision. The magnetogyric ratio determines the frequency of precession of a particle in a magnetic field, as given by the Larmor equation. The magnetogyric ratio of atomic nuclei plays a central role in Nuclear Magnetic Resonance (NMR) in chemistry and in Magnetic Resonance Imaging, a medical imaging application of NMR. The ratio, which is different for every nucleus, simply indicates the frequency with which a nucleus will precess around an externally applied magnetic field.
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