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Wang Z, Aldossary A, Shi T, Liu Y, Li XS, Head-Gordon M. Local Second-Order Møller-Plesset Theory with a Single Threshold Using Orthogonal Virtual Orbitals: Theory, Implementation, and Assessment. J Chem Theory Comput 2023; 19:7577-7591. [PMID: 37877899 DOI: 10.1021/acs.jctc.3c00744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
Abstract
It has long been clear that electron correlation methods exhibit unphysical compute scalings with molecular size, which has motivated the development of local correlation methods to discard effectively zero contributions in a controlled way to yield an approximate correlation energy. The ideal local correlation method should have a single numerical threshold that controls the dropping of terms with the ability to have that threshold set small enough so that the correlation energy is reproduced to enough significant figures such that the result is chemically identical. This work reports such a method for the second-order Møller-Plesset (MP2) theory. The theory, implementation, and testing of this local MP2 theory are reported. Thresholds ranging from 10-5 to 10-8 and basis sets ranging from split valence plus polarization through to quadruple-ζ are assessed for local MP2 calculations on a range of molecules, including linear chains and molecules with two- and three-dimensional character. The implementation is shared memory parallel via OpenMP and yields roughly 50% parallel efficiency with 16 cores for a large job. Considerable efforts were made to minimize memory demands, which increased as thresholds were tightened. A variety of relative energy calculations are presented as a function of threshold to provide some guidance to users on how to obtain adequate precision at a low compute cost. It is particularly clear that derivative properties require tighter thresholds in order to achieve an adequate precision.
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Affiliation(s)
- Zhenling Wang
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Abdulrahman Aldossary
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Tianyi Shi
- Applied Mathematics and Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Yang Liu
- Applied Mathematics and Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Xiaoye S Li
- Applied Mathematics and Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Martin Head-Gordon
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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2
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Chakraborty A, Tribedi S, Maitra R. A double exponential coupled cluster theory in the fragment molecular orbital framework. J Chem Phys 2022; 156:244117. [DOI: 10.1063/5.0090115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Fragmentation-based methods enable electronic structure calculations for large chemical systems through partitioning them into smaller fragments. Here, we have developed and benchmarked a dual exponential operator-based coupled cluster theory to account for high-rank electronic correlation of large chemical systems within the fragment molecular orbital (FMO) framework. Upon partitioning the molecular system into several fragments, the zeroth order reference determinants for each fragment and fragment pair are constructed in a self-consistent manner with two-body FMO expansion. The dynamical correlation is induced through a dual exponential ansatz with a set of fragment-specific rank-one and rank-two operators that act on the individual reference determinants. While the single and double excitations for each fragment are included through the conventional rank-one and rank-two cluster operators, the triple excitation space is spanned via the contraction between the cluster operators and a set of rank-two scattering operators over a few optimized fragment-specific occupied and virtual orbitals. Thus, the high-rank dynamical correlation effects within the FMO framework are computed with rank-one and rank-two parametrization of the wave operator, leading to significant reduction in the number of variables and associated computational scaling over the conventional methods. Through a series of pilot numerical applications on various covalent and non-covalently bonded systems, we have shown the quantitative accuracy of the proposed methodology compared to canonical, as well as FMO-based coupled-cluster single double triple. The accuracy of the proposed method is shown to be systematically improvable upon increasing the number of contractible occupied and virtual molecular orbitals employed to simulate triple excitations.
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Affiliation(s)
- Anish Chakraborty
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Soumi Tribedi
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Rahul Maitra
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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3
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Nakai H. Development of Linear-Scaling Relativistic Quantum Chemistry Covering the Periodic Table. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20210091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hiromi Nakai
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
- Waseda Research Institute for Science and Engineering (WISE), Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan
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4
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Uratani H, Nakai H. Non-adiabatic molecular dynamics with divide-and-conquer type large-scale excited-state calculations. J Chem Phys 2020; 152:224109. [DOI: 10.1063/5.0006831] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Hiroki Uratani
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Hiromi Nakai
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
- Waseda Research Institute for Science and Engineering (WISE), 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8245, Japan
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5
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Yoshikawa T, Komoto N, Nishimura Y, Nakai H. GPU-Accelerated Large-Scale Excited-State Simulation Based on Divide-and-Conquer Time-Dependent Density-Functional Tight-Binding. J Comput Chem 2019; 40:2778-2786. [PMID: 31441083 DOI: 10.1002/jcc.26053] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/04/2019] [Accepted: 08/07/2019] [Indexed: 01/09/2023]
Abstract
The present study implemented the divide-and-conquer time-dependent density-functional tight-binding (DC-TDDFTB) code on a graphical processing unit (GPU). The DC method, which is a linear-scaling scheme, divides a total system into several fragments. By separately solving local equations in individual fragments, the DC method could reduce slow central processing unit (CPU)-GPU memory access, as well as computational cost, and avoid shortfalls of GPU memory. Numerical applications confirmed that the present code on GPU significantly accelerated the TDDFTB calculations, while maintaining accuracy. Furthermore, the DC-TDDFTB simulation of 2-acetylindan-1,3-dione displays excited-state intramolecular proton transfer and provides reasonable absorption and fluorescence energies with the corresponding experimental values. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Takeshi Yoshikawa
- Waseda Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Nana Komoto
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Yoshifumi Nishimura
- Waseda Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Hiromi Nakai
- Waseda Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan.,Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan.,Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto, 615-8520, Japan
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6
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Yoshikawa T, Nakai H. Fractional-occupation-number based divide-and-conquer coupled-cluster theory. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.09.056] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Hayami M, Seino J, Nakajima Y, Nakano M, Ikabata Y, Yoshikawa T, Oyama T, Hiraga K, Hirata S, Nakai H. RAQET: Large-scale two-component relativistic quantum chemistry program package. J Comput Chem 2018; 39:2333-2344. [PMID: 30238477 PMCID: PMC6667904 DOI: 10.1002/jcc.25364] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 05/01/2018] [Accepted: 05/03/2018] [Indexed: 01/21/2023]
Abstract
The Relativistic And Quantum Electronic Theory (RAQET) program is a new software package, which is designed for large-scale two-component relativistic quantum chemical (QC) calculations. The package includes several efficient schemes and algorithms for calculations involving large molecules which contain heavy elements in accurate relativistic formalisms. These calculations can be carried out in terms of the two-component relativistic Hamiltonian, wavefunction theory, density functional theory, core potential scheme, and evaluation of electron repulsion integrals. Furthermore, several techniques, which have frequently been used in non-relativistic QC calculations, have been customized for relativistic calculations. This article introduces the brief theories and capabilities of RAQET with several calculation examples. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Masao Hayami
- Department of Chemistry and Biochemistry, School of Advanced Science and EngineeringWaseda University3‐4‐1 Okubo, Shinjuku‐kuTokyo169‐8555Japan
| | - Junji Seino
- Waseda Research Institute for Science and EngineeringWaseda University3‐4‐1 Okubo, Shinjuku‐kuTokyo169‐8555Japan
- PRESTO, Japan Science and Technology Agency4‐18‐81 Honcho, KawaguchiSaitama332‐0012Japan
| | - Yuya Nakajima
- Department of Chemistry and Biochemistry, School of Advanced Science and EngineeringWaseda University3‐4‐1 Okubo, Shinjuku‐kuTokyo169‐8555Japan
| | - Masahiko Nakano
- Department of Chemistry and Biochemistry, School of Advanced Science and EngineeringWaseda University3‐4‐1 Okubo, Shinjuku‐kuTokyo169‐8555Japan
| | - Yasuhiro Ikabata
- Waseda Research Institute for Science and EngineeringWaseda University3‐4‐1 Okubo, Shinjuku‐kuTokyo169‐8555Japan
| | - Takeshi Yoshikawa
- Department of Chemistry and Biochemistry, School of Advanced Science and EngineeringWaseda University3‐4‐1 Okubo, Shinjuku‐kuTokyo169‐8555Japan
| | - Takuro Oyama
- Department of Chemistry and Biochemistry, School of Advanced Science and EngineeringWaseda University3‐4‐1 Okubo, Shinjuku‐kuTokyo169‐8555Japan
| | - Kenta Hiraga
- Department of Chemistry and Biochemistry, School of Advanced Science and EngineeringWaseda University3‐4‐1 Okubo, Shinjuku‐kuTokyo169‐8555Japan
| | - So Hirata
- CREST, Japan Science and Technology Agency7 Gobancho, Chiyoda‐kuTokyo102‐0076Japan
- Department of ChemistryUniversity of Illinois at Urbana‐Champaign600 South Mathews Avenue, UrbanaIllinois61801
| | - Hiromi Nakai
- Department of Chemistry and Biochemistry, School of Advanced Science and EngineeringWaseda University3‐4‐1 Okubo, Shinjuku‐kuTokyo169‐8555Japan
- Waseda Research Institute for Science and EngineeringWaseda University3‐4‐1 Okubo, Shinjuku‐kuTokyo169‐8555Japan
- CREST, Japan Science and Technology Agency7 Gobancho, Chiyoda‐kuTokyo102‐0076Japan
- ESICB, Kyoto University, Kyotodaigaku‐KatsuraNishikyo‐kuKyoto615‐8520Japan
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Nakano M, Yoshikawa T, Hirata S, Seino J, Nakai H. Computerized implementation of higher-order electron-correlation methods and their linear-scaling divide-and-conquer extensions. J Comput Chem 2017; 38:2520-2527. [PMID: 28795766 DOI: 10.1002/jcc.24912] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 06/28/2017] [Accepted: 07/25/2017] [Indexed: 11/11/2022]
Abstract
We have implemented a linear-scaling divide-and-conquer (DC)-based higher-order coupled-cluster (CC) and Møller-Plesset perturbation theories (MPPT) as well as their combinations automatically by means of the tensor contraction engine, which is a computerized symbolic algebra system. The DC-based energy expressions of the standard CC and MPPT methods and the CC methods augmented with a perturbation correction were proposed for up to high excitation orders [e.g., CCSDTQ, MP4, and CCSD(2)TQ ]. The numerical assessment for hydrogen halide chains, polyene chains, and first coordination sphere (C1) model of photoactive yellow protein has revealed that the DC-based correlation methods provide reliable correlation energies with significantly less computational cost than that of the conventional implementations. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Masahiko Nakano
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Tokyo, 169-8555, Japan
| | - Takeshi Yoshikawa
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Tokyo, 169-8555, Japan
| | - So Hirata
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois, 61801.,CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan
| | - Junji Seino
- Research Institute for Science and Engineering, Waseda University, Tokyo, 169-8555, Japan
| | - Hiromi Nakai
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Tokyo, 169-8555, Japan.,CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.,Research Institute for Science and Engineering, Waseda University, Tokyo, 169-8555, Japan.,ESICB, Kyoto University, Kyoto, 615-8520, Japan
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9
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Nishizawa H, Nishimura Y, Kobayashi M, Irle S, Nakai H. Three pillars for achieving quantum mechanical molecular dynamics simulations of huge systems: Divide-and-conquer, density-functional tight-binding, and massively parallel computation. J Comput Chem 2016; 37:1983-92. [DOI: 10.1002/jcc.24419] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 05/12/2016] [Accepted: 05/17/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Hiroaki Nishizawa
- Department of Theoretical and Computational Molecular Science; Institute for Molecular Science; Okazaki 444-8585 Japan
| | - Yoshifumi Nishimura
- Department of Theoretical and Computational Molecular Science; Institute for Molecular Science; Okazaki 444-8585 Japan
- Research Institute for Science and Engineering; Waseda University; Tokyo 169-8555 Japan
| | - Masato Kobayashi
- Department of Chemistry, Faculty of Science; Hokkaido University; Sapporo 060-0810 Japan
- ESICB, Kyoto University; Kyoto 615-8520 Japan
- PRESTO, Japan Science and Technology Agency; Kawaguchi 332-0012 Japan
| | - Stephan Irle
- Department of Chemistry; Graduate School of Science, and Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University; Nagoya 464-8602 Japan
| | - Hiromi Nakai
- Research Institute for Science and Engineering; Waseda University; Tokyo 169-8555 Japan
- ESICB, Kyoto University; Kyoto 615-8520 Japan
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering; Waseda University; Tokyo 169-8555 Japan
- CREST, Japan Science and Technology Agency; Kawaguchi 332-0012 Japan
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Tsukamoto Y, Ikabata Y, Romero J, Reyes A, Nakai H. The divide-and-conquer second-order proton propagator method based on nuclear orbital plus molecular orbital theory for the efficient computation of proton binding energies. Phys Chem Chem Phys 2016; 18:27422-27431. [DOI: 10.1039/c6cp03786k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient computational method to evaluate the binding energies of many protons in large systems was developed.
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Affiliation(s)
- Yusuke Tsukamoto
- Department of Chemistry and Biochemistry
- School of Advanced Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| | - Yasuhiro Ikabata
- Department of Chemistry and Biochemistry
- School of Advanced Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| | - Jonathan Romero
- Department of Chemistry
- Universidad Nacional de Colombia
- Bogotá
- Colombia
| | - Andrés Reyes
- Department of Chemistry
- Universidad Nacional de Colombia
- Bogotá
- Colombia
| | - Hiromi Nakai
- Department of Chemistry and Biochemistry
- School of Advanced Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
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Second-order Møller–Plesset perturbation (MP2) theory at finite temperature: relation with Surján’s density matrix MP2 and its application to linear-scaling divide-and-conquer method. Theor Chem Acc 2015. [DOI: 10.1007/s00214-015-1710-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Tanaka S, Mochizuki Y, Komeiji Y, Okiyama Y, Fukuzawa K. Electron-correlated fragment-molecular-orbital calculations for biomolecular and nano systems. Phys Chem Chem Phys 2015; 16:10310-44. [PMID: 24740821 DOI: 10.1039/c4cp00316k] [Citation(s) in RCA: 189] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Recent developments in the fragment molecular orbital (FMO) method for theoretical formulation, implementation, and application to nano and biomolecular systems are reviewed. The FMO method has enabled ab initio quantum-mechanical calculations for large molecular systems such as protein-ligand complexes at a reasonable computational cost in a parallelized way. There have been a wealth of application outcomes from the FMO method in the fields of biochemistry, medicinal chemistry and nanotechnology, in which the electron correlation effects play vital roles. With the aid of the advances in high-performance computing, the FMO method promises larger, faster, and more accurate simulations of biomolecular and related systems, including the descriptions of dynamical behaviors in solvent environments. The current status and future prospects of the FMO scheme are addressed in these contexts.
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Affiliation(s)
- Shigenori Tanaka
- Graduate School of System Informatics, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan.
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14
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Akimov AV, Prezhdo OV. Large-Scale Computations in Chemistry: A Bird’s Eye View of a Vibrant Field. Chem Rev 2015; 115:5797-890. [DOI: 10.1021/cr500524c] [Citation(s) in RCA: 159] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Alexey V. Akimov
- Department
of Chemistry, University of South California, Los Angeles, California 90089, United States
| | - Oleg V. Prezhdo
- Department
of Chemistry, University of South California, Los Angeles, California 90089, United States
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Seino J, Nakai H. Local unitary transformation method toward practical electron correlation calculations with scalar relativistic effect in large-scale molecules. J Chem Phys 2013; 139:034109. [DOI: 10.1063/1.4813595] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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16
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Yoshikawa T, Kobayashi M, Fujii A, Nakai H. Novel Approach to Excited-State Calculations of Large Molecules Based on Divide-and-Conquer Method: Application to Photoactive Yellow Protein. J Phys Chem B 2013; 117:5565-73. [DOI: 10.1021/jp401819d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Masato Kobayashi
- Waseda Institute for Advanced Study, Waseda University, Tokyo 169-8050, Japan
| | | | - Hiromi Nakai
- CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama
332-0012, Japan
- ESICB, Kyoto University, Kyotodaigaku-Katsura, Nishigyoku,
Kyoto 615-8520, Japan
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Kobayashi M, Nakai H. An effective energy gradient expression for divide-and-conquer second-order Møller–Plesset perturbation theory. J Chem Phys 2013; 138:044102. [DOI: 10.1063/1.4776228] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Nakata H, Fedorov DG, Nagata T, Yokojima S, Ogata K, Kitaura K, Nakamura S. Unrestricted Hartree-Fock based on the fragment molecular orbital method: Energy and its analytic gradient. J Chem Phys 2012; 137:044110. [DOI: 10.1063/1.4737860] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Kobayashi M, Touma T, Nakai H. Dynamic hyperpolarizability calculations of large systems: The linear-scaling divide-and-conquer approach. J Chem Phys 2012; 136:084108. [DOI: 10.1063/1.3687341] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
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NAKAI H. Discovery of Chemical Principles:Symmetry Rules for Degenerate Excitations. JOURNAL OF COMPUTER CHEMISTRY-JAPAN 2012. [DOI: 10.2477/jccj.2012-0004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Fedorov DG, Nagata T, Kitaura K. Exploring chemistry with the fragment molecular orbital method. Phys Chem Chem Phys 2012; 14:7562-77. [DOI: 10.1039/c2cp23784a] [Citation(s) in RCA: 290] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Kobayashi M, Nakai H. How does it become possible to treat delocalized and/or open-shell systems in fragmentation-based linear-scaling electronic structure calculations? The case of the divide-and-conquer method. Phys Chem Chem Phys 2012; 14:7629-39. [DOI: 10.1039/c2cp40153c] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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