Accurate exchange energy and total energy for excited states: Inclusion   of gradient correction
  We present an approach for accurate calculation of exchange energy and total energy for excited states using time independent density functional formalism. This is done by inclusion of gradient correction into the excited state exchange energy functionals developed by us. We have incorporated Becke and Perdew Wang corrections into our functional and have studied various types of excited states having one and two gaps in occupation of orbitals. 
Md. Shamim, Manoj K. Harbola
physics.chem-ph cond-mat.other