# Mass corrections to the fine structure of hydrogen - like atoms

@article{Salpeter1952MassCT, title={Mass corrections to the fine structure of hydrogen - like atoms}, author={Edwin Salpeter}, journal={Physical Review}, year={1952}, volume={87}, pages={328-343} }

A relativistic four-dimensional wave equation, derived previously, for bound states of a two-body system is discussed further. For any "instantaneous" interaction function an exact three-dimensional equation is derived from it, similar to, but not identical with, the Breit equation. A perturbation theory is developed for a small additional non-instantaneous interaction.

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