Improved result for helium 2(3)S1 ionization energy
A complete calculation of relativistic and quantum electrodynamic effects to order malpha(6) on the energy of the 2(3)S1 state in helium is presented. The result, beyond the previously known radiative corrections, amounts to -3.00(1) MHz, and significantly reduces the theoretical uncertainty. The improved theoretical predictions are compared to the best available experimental result for the 2(3)S1 state.
Pachucki
K
Institute of Theoretical Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland.