SEARCH Articles Figures Tables Correlation energy Correlation potential Correlation potentials, ground-state exchange Correlation states Energy exchanger Energy exchanging Energy first Energy ground state Exchange Correlation energy Exchange correlation Exchange energy Exchange potential Exchange-correlation potential excitation energy Exchange-correlation potential excited states Excitation correlation potential Excitation energy Excited state energy First excited First excited state Ground energy Ground state potential Ground-state correlations Ground-state potential energy Potential energy states State, ground excited