High-precision extrapolation of helium singlet and triplet P-state ionization energies to n=102 using quantum defect methods confirms a 0.474 MHz (9σ) discrepancy with theory for the 1s2s ^3S1 ionization energy of 1152842742.705(16) MHz.
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Theory for the Rydberg states of helium: quantum defect extensions and comparison with experiment up to $n = 102$ for the singlet and triplet $P$-states
High-precision extrapolation of helium singlet and triplet P-state ionization energies to n=102 using quantum defect methods confirms a 0.474 MHz (9σ) discrepancy with theory for the 1s2s ^3S1 ionization energy of 1152842742.705(16) MHz.