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Updated: Dec 2, 2025

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
Quadratically convergent self-consistent field of projected Hartree-Fock
Motoyuki Uejima1, Seiichiro L Ten-No1
1Graduate School of Science, Technology, and Innovation, Kobe University, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.
Abstract:
We report on a quadratically convergent self-consistent field (QC-SCF) algorithm for the spin-projected unrestricted Hartree-Fock (SUHF) to mitigate the slow convergence of SUHF due to the presence of small eigenvalues in the orbital Hessian matrix. The new QC-SCF is robust and stable, allowing us to obtain the SUHF solutions very quickly. To demonstrate the applicability of the method, we present results for test systems with abundant non-dynamic correlation in comparison with the Roothaan repeated diagonalization, Pople extrapolation, and direct inversion of iterative subspace.
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