Answers are grounded in this paper and cite their sources.
Modifications of well-known procedures allow the generation of hierarchies of upper and lower bounds to the second-order energy of perturbation theory. Our results are extremely good for the polarizability of H, fair for the H–H van der Waals interaction, and discouraging for the He interelectronic repulsion.
No takes yet. Share an insight, caveat, or question.
Jerry Goodisman (1967) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: