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Molecule-Adapted Gaussian Basis Sets Generated in Multi-Parallel Hartree-Fock Scheme

For a molecule, all atoms are equally shared in several parallel-computers. Firstly, standard atomic Gaussian parameters (centers and exponents) for each atom are atom-independently and -simultaneously re-optimized by minimizing of molecular energy, while its surrounding atoms are kept in standard ones. For all atoms, by replacing re-optimized Gaussian parameters instead of standard ones, the molecular properties are improved, and such procedure is repeated N-times until a minimum energy is gained. Within the multi-parallel Hartree-Fock (MPHF) scheme, the McLean’s 6-311G set for atoms (H, C, N, O) are re-optimized in various molecular environments, and used to calculate some HF-properties such as molecular energy and its components, and dipole moments. In the MPHF scheme, the eigen energy-related properties (E, εHOMO, εLUMO) are soon converged at N=1~2, but the wave function-related properties (<K>, <V>, μ) are slowly converged to N=5~6. Their limit values are closer to those obtained from the highest quality sets (6-311++G(3df,3pd), aug-cc-pVQZ). By introducing the multi-parallel calculus algorithm in which several computers are simultaneously operated, the time-consuming in the MPHF/6-311G scheme might become smaller than one in the HF scheme based on the 6-311++G(3df,3pd) set. The generation technique of molecule-adapted Gaussian basis sets with the multi-parallel calculus algorithm can be also imitated in the high level schemes such as CASSCF, MP2, DFT and HF over ab initio molecular dynamics.

Gaussian Basis Set, Hartree-Fock Method, Parallel Computer, Floating Shift, Scale Factor

APA Style

Cha, T., Ri, K., Kim, G., Pak, Y. (2023). Molecule-Adapted Gaussian Basis Sets Generated in Multi-Parallel Hartree-Fock Scheme. International Journal of Computational and Theoretical Chemistry, 11(1), 26-33. https://doi.org/10.11648/j.ijctc.20231101.13

ACS Style

Cha, T.; Ri, K.; Kim, G.; Pak, Y. Molecule-Adapted Gaussian Basis Sets Generated in Multi-Parallel Hartree-Fock Scheme. Int. J. Comput. Theor. Chem. 2023, 11(1), 26-33. doi: 10.11648/j.ijctc.20231101.13

AMA Style

Cha T, Ri K, Kim G, Pak Y. Molecule-Adapted Gaussian Basis Sets Generated in Multi-Parallel Hartree-Fock Scheme. Int J Comput Theor Chem. 2023;11(1):26-33. doi: 10.11648/j.ijctc.20231101.13

Copyright © 2023 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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