The proton–magnetogyric ratio or proton–gyromagnetic ratio, γp, is the ratio of the proton's intrinsic magnetic dipole moment to its spin angular momentum. γp is a fundamental physical constant with a CODATA 2010 recommended value:
- γp = (2.675 222 005±0.000 000 063)×108 s−1T−1.
This is also the ratio between the observed resonance frequency and the strength of the magnetic field in proton NMR measurements, such as in MRI imaging or proton magnetometers, so the value of γp is often given in units of MHz/T as:
- γp = (267.522 20±0.000 01) MHz/T.
This is more frequently seen as:
- γp/2π = (42.577 480±0.000 002) MHz/T.
- "CODATA Recommended Values of the Fundamental Physical Constants: 2010". Committee on Data for Science and Technology (CODATA). NIST.
- Jacobsen, Neil E. (2007). NMR spectroscopy explained. Wiley-Interscience. ISBN 9780471730965.
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