1992
DOI: 10.1016/0166-1280(92)87037-z
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Correlation forces in electron scattering from atoms and molecules: a density functional approach

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Cited by 21 publications
(14 citation statements)
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“…We have shown that the treatment of such forces in the intermediate range of distances is a crucial element of the model and that we can test this region in a parameter-free fashion by using either of the possible crossing radii between the DFT-SR forces and the LR-polarisation potential. The present calculations indeed show that, contrary to what has been found for electron collisions [13,16,33], the scattering processes with positron projectiles invariably require a stronger intermediate-range potential and therefore are better described by choosing the outer cut-off radii as matching distances within the LYP formulation of the correlation forces. In other words, the present DFT model allows one to make a distinction, as is physically expected, between correlation effects from either electron or positron collisions by using a stronger DFT model of correlation forces for the latter as opposed to the former projectile.…”
Section: Discussioncontrasting
confidence: 58%
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“…We have shown that the treatment of such forces in the intermediate range of distances is a crucial element of the model and that we can test this region in a parameter-free fashion by using either of the possible crossing radii between the DFT-SR forces and the LR-polarisation potential. The present calculations indeed show that, contrary to what has been found for electron collisions [13,16,33], the scattering processes with positron projectiles invariably require a stronger intermediate-range potential and therefore are better described by choosing the outer cut-off radii as matching distances within the LYP formulation of the correlation forces. In other words, the present DFT model allows one to make a distinction, as is physically expected, between correlation effects from either electron or positron collisions by using a stronger DFT model of correlation forces for the latter as opposed to the former projectile.…”
Section: Discussioncontrasting
confidence: 58%
“…Several suggestions by various authors [14,15] produced different choicesf~(L R) and provided the correlation energy as a direct, local functional of the target electronic density. We have discussed this derivation in detail earlier on [13,16] and will not be repeating it here. Suffice it to say, however, that the evaluation of the correlation energy as a functional of the target density, and given by the specific form derived forf~ff, li) in (4) [19], is based on the following physical picture [24]:…”
Section: The Eorrelation-polarisation Potentialmentioning
confidence: 94%
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