Relativistic corrections to the thermal interaction of bound particles

This paper discusses relativistic corrections to the thermal Coulomb potential for simple atomic systems. The theoretical description of revealed is carried out within framework quantum electrodymamics (QED). As a result, fine and hyperfine strucutres levels are introduced. theory presented in this based on assumption that atom placed environment created by blackbody radiation (BBR). numerical results allow us expect hteir significance modern experiments testing fundamental interactions.