Abstract
It is shown that the Galerkin-Petrov method if applied in a controlled way yields reliable results for excited states of the same symmetry classifications as the ground state. Computations are performed for the 21 S and 31 S states of He. The problem of optimizing nonlinear parameters of the basis functions by means of the GP method is discussed. A special optimization scheme is suggested and numerically illustrated for someS states of He.
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Jankowski, K., Rutkowska, D. & Rutkowski, A. An investigation of the reliability of the Galerkin-Petrov method. Theoret. Chim. Acta 48, 119–125 (1978). https://doi.org/10.1007/BF02399022
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DOI: https://doi.org/10.1007/BF02399022