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Variational calculation of small energy differences. The singlet-triplet gap in [Cu2Cl6]2−

EngineeringPhysicsVariational CalculationNatural SciencesSmall Energy DifferencesApplied PhysicsCondensed Matter PhysicsPhysical ChemistryComputational ChemistryQuantum ChemistryChemistrySinglet-triplet GapElectronic StructureAb-initio Method