Proton mass corrections to the Lamb shift of hydrogen of order {α}(Z{α})⁵{m}²$/M are evaluated. These contributions are expected new terms beyond those given earlier for recoil effects to the self-energy of a bound electron in the external-field approximation. The new contribution of this order is -0.53 kHz, thus making the complete radiative-recoil correction of this order -2.53 kHz.
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Bhatt et al. (1987) studied this question.
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