One-loop vacuum polarization at mα7 and higher orders for three-body molecular systems

We present calculations of the one-loop vacuum polarization correction (Uehling potential) for the three-body problem in the NRQED formalism. The case of one-electron molecular systems is considered. Numerical results of the vacuum polarization contribution at m alpha(7) and higher orders for the fundamental transitions (v = 0, L = 0)->(v' = 1, L' = 0) in the H-2(+) and HD+ molecular ions are presented and compared with calculations performed in the adiabatic approximation. The residual uncertainty from this contribution in the transition frequencies is shown to be a few tens of Hz.