A hybrid functional for the exchange-correlation kernel in time-dependent density functional theory
Kieron Burke, Martin Petersilka, E. K. U. Gross
Abstract
A review of the approximations in any time-dependent density functional calculation of excitation energies is given. The single-pole approximation for the susceptibility is used to understand errors in popular approximations for the exchange-correlation kernel. A new hybrid of exact exchange and adiabatic local density approximation is proposed and tested on the He and Be atoms.
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