First excited-state application of active-orbital CC(t;3) and adaptive CC(P;Q) reproduces CCSDT/EOMCCSDT water potential cuts to within about 1-2 millihartree using 1-2% of triple excitations.
Emrich, An extension of the coupled cluster formalism to excited states (I), Nucl
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Extension of the Active-Orbital-Based and Adaptive CC($P$;$Q$) Approaches to Excited Electronic States: Application to Potential Cuts of Water
First excited-state application of active-orbital CC(t;3) and adaptive CC(P;Q) reproduces CCSDT/EOMCCSDT water potential cuts to within about 1-2 millihartree using 1-2% of triple excitations.