Abstract:
In the framework of quantum electrodynamics, we consider the bound states of a system
of two fermions with masses $m$ (electron) and $M$ (nucleus). In the case $m\ll M$ and
with radiative corrections ignored, closed expressions are obtained for the mass corrections
of order $m/M$ without an expansion in $\alpha Z$ ($\alpha$ is the fine structure constant, and $Z$ is the charge of the nucleus).
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