A hybrid functional for the exchange-correlation kernel in time-dependent density functional theory
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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.
seven two-column pages, including one figure, to appear in "Recent advances in density functional methods, Vol. III", ed. by P. Fantucci and A. Bencini (World scientific press, 2000). For related papers, see http://crab.rutgers.edu/~kieron
seven two-column pages, including one figure, to appear in "Recent advances in density functional methods, Vol. III", ed. by P. Fantucci and A. Bencini (World scientific press, 2000). For related papers, see http://crab.rutgers.edu/~kieron