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## Landé g-factorIn physics, the ## Additional recommended knowledgeIn atomic physics, it is a multiplicative term appearing in the expression for the energy levels of an atom in a weak magnetic field. The quantum states of electrons in atomic orbitals are normally degenerate in energy, with the degenerate states all sharing the same angular momentum. When the atom is placed in a weak magnetic field, however, the degeneracy is lifted. The factor comes about during the calculation of the first-order perturbation in the energy of an atom when a weak uniform magnetic field (that is, weak in comparison to the system's internal magnetic field) is applied to the system. Formally we can write the factor as, Here, g are other g-factors of an electron, as defined in the article on g-factors.
_{S}If we wish to know the g-factor for an atom with total atomic angular momentum F=I+J, This last approximation is justified because |

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Landé_g-factor". A list of authors is available in Wikipedia. |