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Just wondering if there's any accurate method for direct measurement of the ionization energy of atomic Hydrogen and/or Deuterium ?
There's lots of measurements on transitions between various hydrogen/deuterium energy levels but not (it seems) to the limit where n = infinity.
Alternatively could one measure the difference between ionization energies of hydrogen and deuterium since you could (I think) derive the separate ionization energies from calculations based on the difference. See for example Problem 5.72 in the linked reference.
There's lots of measurements on transitions between various hydrogen/deuterium energy levels but not (it seems) to the limit where n = infinity.
Alternatively could one measure the difference between ionization energies of hydrogen and deuterium since you could (I think) derive the separate ionization energies from calculations based on the difference. See for example Problem 5.72 in the linked reference.