At the critical coupling where the helium ground state reaches the continuum, the wavefunction decays at a rate proportional to the square root of the maximum electron distance, and a ground state exists even for finite nuclear mass.
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Quantum Systems at The Brink: Helium-type systems
At the critical coupling where the helium ground state reaches the continuum, the wavefunction decays at a rate proportional to the square root of the maximum electron distance, and a ground state exists even for finite nuclear mass.