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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 Stefan Procopiu[1] and rediscovered independently two years later by Danish physicist Niels Bohr. It is sometimes called the Bohr-Procopiu magneton.
The Bohr magneton is defined in SI units by
and in Gaussian centimeter-gram-second units by
where
- e is the elementary charge,
 is the reduced Planck constant,- me is the electron rest mass
- c is the speed of light.
In the SI system of units its value is[2]
- µB = 9.274 009 15(23) × 10-24 J•T-1.
In the eV system of units its value is
- µB = 5.7883 × 10-5 eV•T-1.
In the CGS system of units its value is
- µB = 9.274 009 15(23) × 10-21 Erg•Oe-1 [3]
In atomic units, the Bohr magneton is µB=1/2.
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.[4]
References
- ^ Stefan Procopiu – Determining the Molecular Magnetic Moment by M. Planck’s Quantum Theory - Bulletin scientifique de l’Académie roumaine de sciences, Bucharest, 1913
- ^ CODATA
- ^ 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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