Abstract
THE starting point of this work is the expression, which is not at all new,where the index in the subscript refers to theth eigenstate of a Hamiltonianand the index in the superscript refers to the order of correction, the zero-order terms being the eigensolutions satisfyingand S indicates summation over the discrete spectrum and integration over the continuum.
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SHARMA, C., BOWTELL, G. New Approach to Correlation Energies in Atoms. Nature Physical Science 233, 34–35 (1971). https://doi.org/10.1038/physci233034a0
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DOI: https://doi.org/10.1038/physci233034a0
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