The ground-state ionization potential of the He⁴ atom is found to be 5 945 204 223 (42) MHz. Along with lower-order contributions, this result includes all effects of relative order α⁴, α³mₑ/m_α, and α⁵ln²α. Effective operators derived in dimensionally regularized nonrelativistic quantum electrodynamics are employed. The average values of these operators are evaluated using a high-accuracy variational wave function constructed in an exponential basis.
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Korobov et al. (2001) studied this question.
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