Hardness and excitation energy
The concept of the ensemble Kohn-Sham hardness is introduced. It is shown that the first excitation energy can be given by the Kohn-Sham hardness (i.e. the energy difference of the ground-state lowest unoccupied and highest occupied levels) plus an extra term coming from the partial derivative of the ensemble exchange-correlation energy with respect to the weighting factorw in the limitw → 0. It is proposed that the first excitation energy can be used as a reactivity index instead of the hardness.
Volume 133, 2021
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