EXIDOS achieves chemical accuracy for multiple excited states in small molecules by variational optimization of low-energy subspaces using non-orthogonal Slater determinants without explicit orthogonality or symmetry constraints.
Sharma, A general non-abelian density matrix renor- malization group algorithm with application to the c2 dimer, The Journal of Chemical Physics142, 10.1063/1.4905237 (2015)
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Variational low-energy subspaces for chemically accurate excited states
EXIDOS achieves chemical accuracy for multiple excited states in small molecules by variational optimization of low-energy subspaces using non-orthogonal Slater determinants without explicit orthogonality or symmetry constraints.