Alternative approach to stationary perturbation theory for separable problems

A new implementation of stationary perturbation theory for separable quantum‐mechanical problems is presented which allows the calculation of perturbation corrections for all the states simultaneously, so that the results are expressed in terms of the quantum numbers of the unperturbed system. The anharmonic oscillator, the Stark effect in a rigid rotor, and a caged harmonic oscillator are considered as illustrative examples.

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