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Energy levels of a system with just two electrons?
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[QUOTE="nrqed, post: 5994722, member: 15416"] You are correct about the impossibility of a bound state with two electrons, the question should have been about positronium. That said, the equation you wrote for positronium is actually valid for any hydrogen-like atom: an atom made of a nucleus with a charge Z and a single electron orbiting the nucleus. In the case of positronium, we can think of the nucleus as being simply the positron. In any case, just use Z^2=1 for positronium. All you have left to do is to figure out the reduced mass ##\mu## for your two electron atom (or, which is the same, for positronium) and for helium, and relate the energies of Helium to the energies of positronium. [/QUOTE]
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Energy levels of a system with just two electrons?
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