Local-density approximation for exchange energy functional in   excited-state density functional theory
  An exchange energy functional is proposed and tested for obtaining a class of excited-state energies using density functional formalism. The functional is the excited-state counterpart of the local-density approximation functional for the ground state. It takes care of the state dependence of the energy functional and leads to highly accurate excitation energies. 
Prasanjit Samal and Manoj K. Harbola