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Spin-orbit corrections of order $mα^6$ to the fine structure of $(37,35)$ state in $^4{He}^+\bar{p}$ atom

Precise numerical calculation of radiofrequency intervals between hyperfine sublevels of the $(37,35)$ state of the antiprotonic helium-4 atom is presented. Theoretical consideration includes the QED corrections of order $mα^6$ to the electron spin-orbit interaction. The effective Hamiltonian is derived using the formalism of the nonrelativistic quantum electrodynamics (NRQED).

preprint2009arXivOpen access

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