(atomic physics) The amount he/4πmc of magnetic moment, where h is Planck's constant, e and m are the charge and mass of the electron, and c is the speed of light.
Bohr magneton
| Sci-Tech Dictionary: Bohr magneton |
(′bör ′mag·nə′tän)
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| Measures and Units: Bohr magneton |
Symbol μB. See magneton.
| Wikipedia: Bohr magneton |
In atomic physics, the Bohr magneton (symbol μB) is a physical constant of magnetic moment of electrons. It was discovered in 1913 by Romanian physicist Ştefan Procopiu[1] and rediscovered independently two years later by Danish physicist Niels Bohr. It is sometimes called the Bohr-Procopiu magneton.
| system of units | value | units |
|---|---|---|
| SI | 9.27400915(23)×10−24[2] | J·T-1[3] |
| eV | 5.7883×10−5 | eV·T-1 |
| CGS | 9.27400915(23)×10−21[4] | Erg·Oe-1 |
| atomic units | 1⁄2 | none |
The Bohr magneton is defined in SI units by
and in Gaussian centimeter-gram-second units by
where
- e is the elementary charge,
- ħ is the reduced Planck constant,
- me is the electron rest mass and
- c is the speed of light.
The Bohr magneton is the natural unit for expressing an electron magnetic dipole moment. An electron has an intrinsic magnetic dipole moment of approximately one Bohr magneton.[5]
References
- ^ Ştefan Procopiu – Determining the Molecular Magnetic Moment by M. Planck’s Quantum Theory - Bulletin scientifique de l’Académie roumaine de sciences, Bucharest, 1913
- ^ CODATA
- ^ The units, J·T-1, can also be written as A·m2, or as C·m2·s-1.
- ^ Robert C. O'Handley (2000). Modern magnetic materials: principles and applications. John Wiley & Sons. ISBN 0-471-15566-7 page 83
- ^ A. Mahajan and A. Rangwala. Electricity and Magnetism, p. 419 (1989). Via Google Books.
See also
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- List of scientific constants named after people
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