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• W2009587182 abstract "Using a rapidly convergent composite basis of Frankowski-Pekeris and Frankowski functions, we have accurately calculated the nodal surfaces of low-lying excited states of the helium atom to investigate Bressanini and Reynolds' conjecture [D. Bressanini and P. J. Reynolds, Phys. Rev. Lett. 95, 110201 (2005)] that these nodal surfaces are rigorously independent of the interelectronic angle ${ensuremath{theta}}_{12}$. We find that in fact there is a slight dependence of the nodal surfaces on ${ensuremath{theta}}_{12}$, but it is so small that the assumption of strict independence may well yield extremely useful approximations in fixed-node quantum Monte Carlo calculations. We explain how Kato's cusp conditions determine the qualitative features of these nodal surfaces, which can accurately be modeled using the familiar ansatz of a symmetric or antisymmetric linear combination of products of hydrogenic orbitals, with some adjustments of the parameters. We explain why a similar near independence of the nodal surfaces on the angular variables can be expected for the ground and singly excited states of the lithium atom, but generally not for larger atoms." @default.
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• W2009587182 date "2007-06-18" @default.
• W2009587182 modified "2023-09-26" @default.
• W2009587182 title "Nodal surfaces of helium atom eigenfunctions" @default.
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• W2009587182 doi "https://doi.org/10.1103/physreva.75.060101" @default.
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