Two-center magnetic-multipole interaction between atoms, molecules, and nuclei

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Abstract
A general formula in the form of a product of irreducible tensors is derived for the magnetic multipole-multipole interaction of any order between two nonoverlapping charge distributions. These two charge centers may be separate atoms, molecules, or nuclei. In the limit of low order, the formula is shown to reduce to the conventional spin-spin (magnetic dipole-dipole) interaction. It also reduces to a two-center expansion term obtainable from the conventional spin-other-orbit interaction.