Abstract
The ground state and the first two excited state energy levels for the interaction of the type λx2/(1+gx2) have been calculated nonperturbatively as the eigenvalues of the one-dimensional Schrödinger operator defined by Au=−u′′+x2u+λx2u/(1+gx2). The Ritz variational method in combination with the Givens–Householder algorithm has been used for numerical computations.

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