Low lying atomic excitation spectrum via global optimization of the wave function: an atomic configuration interaction via generalization of laguerre type orbitals
Abstract
We propose simple analytic, selectively orthogonalizable, generalized Laguerre type atomic orbitals, providing clear physical interpretation and near equivalent accuracy with numerical multi-configuration self-consistent field, to atomic configuration interaction calculations. By analyzing the general Eckart theorem, we develop a scheme to ab initio estimate the proximity to the exact energy of excited atomic states. We use their simple interpretation, via a thorough investigation in orbital space, to estimate, for the first time, (without considering the exact value), the ab initio energy uncertainty for excited states. The radiative decay rates from low-lying doubly excited states 1P° to singly excited states 1Se and 1De of He has been investigated theoretically by using analytic generalized Laguerre type atomic orbitals of nearly numerical multi-configuration self-consistent field accuracy in a non-orthogonal configuration interaction scheme. From these rates, we calculate the VUV p ...
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