We consider the 1s2s 1,3 S states of the two-electron three-dimensional quantum dot with a Gaussian one-body potential, −V0 exp(−λr 2 ). For a single electron, a simple scaling relation allows the reduction into a one-parameter problem in terms of V 0 λ . However, for the two-electron system, the interelectronic repulsion term, 1 r 12 , frustrates this simple scaling transformation, so we face a genuine two-parameter system. We pay particular attention to the location and nature of the critical well-depths, at which the binding energy of the second electron vanishes. Several observations are noteworthy: For all λ, the triplet critical well-depth is lower than that in the singly excited singlet state. Hence, there exists a finite range of well-depths for which the triplet is bound and the singlet is not, a feature that can possibly be applied in some device. Above its critical well-depth, the triplet state energy is always lower than that of the singly excited singlet. Both well-depths are considerably higher than the critical well-depth in the ground state. The expectation value of the interelectronic repulsion is always lower in the triplet, like the harmonic quantum dot but unlike He-like atoms, the two-particle Debye (Yukawa) atom, or the confined He atom. In the infinite well-depth (V0) limit, keeping the well-width 1 λ constant, the energies and other expectation values of the bound states of the two-electron Gaussian quantum dot approach those of a non-interacting harmonic two-electron system.
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