Pre-Born–Oppenheimer energies, leading-order relativistic and QED corrections for electronically excited states of molecular hydrogen

For rovibronic states corresponding to the B and B′1Σu+ electronic of hydrogen molecule, pre-Born–Oppenheimer (four-particle) non-relativistic energy is converged a 1–3 parts-per-billion relative precision. The four-particle appended with leading-order relativistic, leading- estimated higher-order quantum-electrodynamics corrections. resulting term values referenced ground state are obtained in an excellent agreement experimental results. Further results reported discussed for other assignable C1Πu EF,GK, HH1Σg+ states.