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Liberti, Leo; Lavor, Carlile; Maculan, Nelson

A mathematical programming formulation for the Hartree-Fock problem on open-shell systems. (English) Zbl 1428.90161

Optim. Lett. 13, No. 2, 429-437 (2019).
Summary: The solutions of the time-independent Schrödinger equation provide a quantum description of the stationary state of electrons in atoms and molecules. The Hartree-Fock problem consists in expressing these solutions by means of finite dimensional approximations thereof. These are themselves linear combinations of an existing linearly independent set; best approximations are obtained when a certain energy function is minimized. In [C. Lavor et al., “Solving Hartree-Fock systems with global optimization methods”, Europhys. Lett. 5, No. 77, 50006p1–50006p5 (2007; doi:10.1209/0295-5075/77/50006)] we proposed a new mathematical programming (MP) approach which enhanced the likelihood of attaining globally optimal approximations, limited to closed-shell atomic systems. In this paper, we discuss an extension to open-shell systems: this is nontrivial as it requires the expression of a rank constraint within an MP formulation. We achieve this by explicitly modelling eigenvalues and requiring them to be nonzero. Although our approach might not necessarily scale well, we show it works on two open-shell systems (lithium and boron).

MSC:

90C30 Nonlinear programming
90C90 Applications of mathematical programming

Keywords:

quantum chemistry; mathematical programming; linear independence; rank constraint

Software:

DONLP2; SNOPT; AMPL
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\textit{L. Liberti} et al., Optim. Lett. 13, No. 2, 429--437 (2019; Zbl 1428.90161)
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