Divide-and-conquer linear-scaling quantum chemical computations

H Nakai, M Kobayashi, T Yoshikawa… - The Journal of …, 2023 - ACS Publications
Fragmentation and embedding schemes are of great importance when applying quantum-
chemical calculations to more complex and attractive targets. The divide-and-conquer (DC) …

Development of linear-scaling relativistic quantum chemistry covering the periodic table

H Nakai - Bulletin of the Chemical Society of Japan, 2021 - academic.oup.com
Abstract This Award Account focuses on the author's studies on the theoretical
developments of two-component (2c) relativistic quantum chemistry calculations for large …

RAQET: Large‐scale two‐component relativistic quantum chemistry program package

M Hayami, J Seino, Y Nakajima… - Journal of …, 2018 - Wiley Online Library
The Relativistic And Quantum Electronic Theory (RAQET) program is a new software
package, which is designed for large‐scale two‐component relativistic quantum chemical …

Relativistic density functional theory with picture-change corrected electron density based on infinite-order Douglas-Kroll-Hess method

T Oyama, Y Ikabata, J Seino, H Nakai - Chemical Physics Letters, 2017 - Elsevier
This Letter proposes a density functional treatment based on the two-component relativistic
scheme at the infinite-order Douglas-Kroll-Hess (IODKH) level. The exchange-correlation …

Picture-change correction in relativistic density functional theory

Y Ikabata, H Nakai - Physical Chemistry Chemical Physics, 2021 - pubs.rsc.org
Relativistic quantum chemical calculations are performed based on one of two physical
pictures, namely the Dirac picture and the Schrödinger picture. With regard to the latter, the …

Practical electronic ground- and excited-state calculation method for lanthanide complexes based on frozen core potential approximation to 4f electrons

M Kobayashi, Y Oba, T Akama, T Taketsugu - Journal of mathematical …, 2023 - Springer
A practical electronic ground-and excited-state calculation method for lanthanide complexes
is proposed by introducing frozen core potential (FCP) approximation to 4 f electrons of a …

Large‐scale two‐component relativistic quantum‐chemical theory: Combination of the infinite‐order douglas–kroll–hess method with the local unitary transformation …

J Seino, H Nakai - International Journal of Quantum Chemistry, 2015 - Wiley Online Library
Large‐scale two‐component (2c) relativistic quantum‐chemical (RQC) theory is reviewed.
We briefly discuss the theories, advantages, and extensibilities of an overall linear‐scaling …

Extension of accompanying coordinate expansion and recurrence relation method for general‐contraction basis sets

M Hayami, J Seino, H Nakai - Journal of Computational …, 2014 - Wiley Online Library
An algorithm of the accompanying coordinate expansion and recurrence relation (ACE‐RR),
which is used for the rapid evaluation of the electron repulsion integral (ERI), has been …

Relativistic frozen core potential scheme with relaxation of core electrons

Y Nakajima, J Seino, M Hayami, H Nakai - Chemical Physics Letters, 2016 - Elsevier
This letter proposes a relaxation scheme for core electrons based on the frozen core
potential method at the infinite-order Douglas–Kroll–Hess level, called FCP-CR. The core …

Relativistic effect on enthalpy of formation for transition-metal complexes

Y Nakajima, J Seino, H Nakai - Chemical Physics Letters, 2017 - Elsevier
This Letter examines the enthalpy of formation for 12 transition metal diatomic molecules
and 23 transition metal complexes from the viewpoint of effect of the relativistic effect by …