The ionization energy of the 2 ^3S_1 metastable state of 4He is measured as 1,152,842,742.7082(55)(25) MHz, in 9 sigma disagreement with the best QED calculation.
Drake, Quantum Defect Theory and Analysis of High- Precision Helium Term Energies, Adv
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Metrology in a two-electron atom: The ionization energy of metastable triplet helium ($\mathbf{2\,^3S}_\mathbf{1}$)
The ionization energy of the 2 ^3S_1 metastable state of 4He is measured as 1,152,842,742.7082(55)(25) MHz, in 9 sigma disagreement with the best QED calculation.