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.
Hartree–Fock solutions as a quasidiabatic basis for nonorthogonal configuration interaction
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Chemical properties and symmetries, not variational energy, should guide UHF trial selection for ph-AFQMC on iron-sulfur clusters, yielding accurate energies despite suboptimal sampling and bias compensation.
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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.
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Selecting optimal unrestricted Hartree-Fock trial wavefunctions for phaseless auxiliary-field quantum Monte Carlo: Accuracy and limitations in modeling three iron-sulfur clusters
Chemical properties and symmetries, not variational energy, should guide UHF trial selection for ph-AFQMC on iron-sulfur clusters, yielding accurate energies despite suboptimal sampling and bias compensation.