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arxiv: 1202.5764 · v1 · pith:LSGU74KXnew · submitted 2012-02-26 · ⚛️ physics.chem-ph

Effect of discontinuities in Kohn-Sham-based chemical reactivity theory

classification ⚛️ physics.chem-ph
keywords reactivitychemicaldiscontinuitieskerneltheoryaccountcorrectlydensity
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We provide a new derivation of a formula for the Fukui function of density-functional chemical reactivity theory which incorporates the discontinuities in the Kohn-Sham reference system. Orbital relaxations are described in terms of the exchange-correlation (XC) kernel, i.e., the derivative of the XC potential with respect to the density and it is shown that in order to correctly measure the reactivity toward a nucleophilic reagent a discontinuity of the XC kernel has to be taken into account. The importance of this finding is illustrated in model molecular systems.

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