SI and Gaussian-CGS Variants, and Magnetism-related Units
There are two common variants of atomic units, one where they are used in conjunction with SI units for electromagnetism, and one where they are used with Gaussian-CGS units. Although the units written above are the same either way (including the unit for electric field), the units related to magnetism are not. In the SI system, the atomic unit for magnetic field is
- 1 a.u. = = 2.35×105 T = 2.35×109 G,
and in the Gaussian-cgs unit system, the atomic unit for magnetic field is
- 1 a.u. = = 1.72×103 T = 1.72×107 G.
(These differ by a factor of α.)
Other magnetism-related quantities are also different in the two systems. An important example is the Bohr magneton: In SI-based atomic units,
- a.u.
and in Gaussian-based atomic units,
- a.u.
Read more about this topic: Atomic Units
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