For the cubic radial anharmonic oscillator, a three-parameter interpolating wavefunction gives energies accurate to roughly seven to eight digits and wavefunctions within about 1e-4 across all distances.
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Radial Anharmonic Oscillator: Perturbation Theory, New Semiclassical Expansion, Approximating Eigenfunctions. I. Generalities, Cubic Anharmonicity Case
For the cubic radial anharmonic oscillator, a three-parameter interpolating wavefunction gives energies accurate to roughly seven to eight digits and wavefunctions within about 1e-4 across all distances.