Abstract
The spectrum, electron-density distribution and ground-state correlationenergy of two electrons confined by an anisotropic harmonic oscillatorpotential have been studied for different confinement strengths ω byusing the quantum chemical configuration interaction (CI) method employing alarge Cartesian anisotropic Gaussian basis set and a full CI wavefunction.Energy level diagrams and electron-density distributions are displayed forselected electronic states and confinement parameters. The total energy andspacing between energy levels increase in all cases with increasing ω. Theenergy level structure cannot be matched by scaling with respect to ω.The correlation energy of the ground state is comparable in magnitudeto that of the helium atom. It increases for increasing ω. Thepercentage of the correlation energy with respect to the total energy of theground state is considerably larger than that of the helium atom.
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