Physical Review A
Quantum-electrodynamic corrections of O(mc2α6lnα) to the electron-electron interaction in helium are evaluated for several states. The additional energy shift, which is an order of α smaller than the leading Araki-Sucher terms, raises the predicted energy of the 1s2s 1S0 state by 2.49 MHz to -960 332 039.43(18) MHz relative to He+(1s). The new value significantly alters the comparison with recent high-precision experiments. © 1993 The American Physical Society.
Drake, Gordon W. F.; Khriplovich, I. B.; Milstein, A. I.; and Yelkhovsky, A. S.. (1993). Energy corrections of order mc2α6lnα in helium. Physical Review A, 48 (1), R15-R17.