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In atomic physics, the Bohr magneton (symbol ) is named after the physicist Niels Bohr.It is a physical constant of magnetic moment, defined in S.I. units by: and in Gaussian centimeter-gram-second units by: where: is the elementary charge, is the reduced Planck's constant, is the electron rest mass is the speed of light. In the SI system of units its value is: = 9.274 009 49(80) × 10-24 J·T-1 and in the centimeter-gram-second system of units: = 9.274 009 49(80) × 10-21 erg·G-1 The Bohr magneton is the natural unit for expressing the electron magnetic dipole moment. The Bohr magneton was first calculated by Romanian physicist Stefan Procopiu and is also known as the Bohr-Procopiu Magneton.
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