One-loop vacuum polarization at m$alpha$7 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) $rightarrow$ (v = 1, L = 0) in the H2+ and HD+ molecular ions are presented and compared with calculations performed in the adiabatic approximation. The residual uncertainty from this contribution on the transition frequencies is shown to be of a few tens of Hz.