A few hundred optimized non-orthogonal Slater determinants achieve lower variational energies than CCSD(T) for several molecules in double-zeta basis via an exact iterative orbital optimization and fourth-power scaling tensor contraction.
Gerratt, General Theory of Spin-Coupled Wave Func- tions for Atoms and Molecules, Advances in Atomic and Molecular Physics 7, 141 (1971)
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Precise Quantum Chemistry calculations with few Slater Determinants
A few hundred optimized non-orthogonal Slater determinants achieve lower variational energies than CCSD(T) for several molecules in double-zeta basis via an exact iterative orbital optimization and fourth-power scaling tensor contraction.