SEARCH Articles Figures Tables Configuration excitation hierarchy Configuration interaction double excitation Configuration interaction doubly excited Configuration interaction doubly excited configurations Configuration interaction excitation level truncation Configuration interaction excited electronic states Configuration interaction singly excited Configuration interaction singly excited configurations Configuration mono-excited Correlation energy doubly excited configurations Correlation energy triply excited configurations Direct-excitation configuration Doubles, doubly excited configurations Doubly excited configuration Doubly excited electron configuration Doubly excited electron configuration calculation Electronic configuration excited state Electronic structure excited state configurations Ethylene excited state configuration Excitation configuration interaction Excitation configuration interaction multireference double Excited configuration, resulting Excited configurations under pressure Excited electronic configuration Excited species electron configurations Excited state electron configuration Excited states configuration interaction Excited states multi-configurational self-consistent Excited-state configuration First excited state configuration Locally excited configuration Low-Lying Excited States of Lanthanide Diatomics Studied by Four-Component Relativistic Configuration Interaction Methods Mixing with excited configurations Multireference double excitation configuration Multireference double excitation configuration interaction theory Multireference single- and double-excitation configuration interaction Oxidation states excited state configurations Quadratic configuration interaction with double and single excitations Single and double excitation configuration Single excitation configuration interactions approach Single-excitation configuration interaction Single/double excitation configurational Single/double excitation configurational electron correlation Single/double excitation configurational interaction calculations Single/double excitation configurational size consistency Symmetry-Adapted Cluster- Configuration excited states