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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 6571-6575 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The local density approximation is used to construct a model for the reactivity parameters defined in density functional theory. Starting from a model for the hardness kernel, equations are derived to compute the softness kernel, local softness and local hardness, global softness and global hardness, the Fukui function and also the electric dipole polarizability. A very simple functional is used to test the equations in some atomic systems. The results are promising. Extensions and applications of the model are discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 9807-9811 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The equations to study the variation of the hardness and the Kohn–Sham Fukui function under the action of an external perturbation are given. Perturbative equations involving the Unsöld approximation are presented. It is found that the variation of the Kohn–Sham Fukui function depends only on the knowledge of the highest occupied molecular orbital density and a mean energy difference which can be interpreted as the band gap or the finite difference approximation for the hardness. The equation for the variation of the hardness is more involved and it depends on the knowledge of the linear response function and the functional derivative of the exchange-correlation potential. However, a simplified way to calculate the variation of hardness is proposed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 69 (1998), S. 559-565 
    ISSN: 0020-7608
    Keywords: density functional theory ; electron localization ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using some relationships derived from the density functional version of the virial theorem, an approximated kinetic energy density is constructed. This is used to implement a modified version of the electron localization function (ELF). Its principal differences with the original ELF are that it does not depend on the orbitals and it reduces to zero when the distance r to the nucleus goes to 0 or infinity. Otherwise, it reproduces all the properties of the ELF function. However, the conceptual interpretation of ELF as coming from the pair probability is lost.   © 1998 John Wiley & Sons, Inc. Int J Quant Chem 69: 559-565, 1998
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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