1
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Mukherjee S, Mattos RS, Toldo JM, Lischka H, Barbatti M. Prediction Challenge: Simulating Rydberg photoexcited cyclobutanone with surface hopping dynamics based on different electronic structure methods. J Chem Phys 2024; 160:154306. [PMID: 38624122 DOI: 10.1063/5.0203636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Accepted: 03/28/2024] [Indexed: 04/17/2024] Open
Abstract
This research examines the nonadiabatic dynamics of cyclobutanone after excitation into the n → 3s Rydberg S2 state. It stems from our contribution to the Special Topic of the Journal of Chemical Physics to test the predictive capability of computational chemistry against unseen experimental data. Decoherence-corrected fewest-switches surface hopping was used to simulate nonadiabatic dynamics with full and approximated nonadiabatic couplings. Several simulation sets were computed with different electronic structure methods, including a multiconfigurational wavefunction [multiconfigurational self-consistent field (MCSCF)] specially built to describe dissociative channels, multireference semiempirical approach, time-dependent density functional theory, algebraic diagrammatic construction, and coupled cluster. MCSCF dynamics predicts a slow deactivation of the S2 state (10 ps), followed by an ultrafast population transfer from S1 to S0 (<100 fs). CO elimination (C3 channel) dominates over C2H4 formation (C2 channel). These findings radically differ from the other methods, which predicted S2 lifetimes 10-250 times shorter and C2 channel predominance. These results suggest that routine electronic structure methods may hold low predictive power for the outcome of nonadiabatic dynamics.
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Affiliation(s)
| | - Rafael S Mattos
- Aix Marseille University, CNRS, ICR, Marseille 13397, France
| | - Josene M Toldo
- Aix Marseille University, CNRS, ICR, Marseille 13397, France
| | - Hans Lischka
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
| | - Mario Barbatti
- Aix Marseille University, CNRS, ICR, Marseille 13397, France
- Institut Universitaire de France, Paris 75231, France
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2
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Pansini FNN, Mota VC, Varandas AJC. Optimized Structural Data at the Complete Basis Set Limit via Successive Quadratic Minimizations. J Phys Chem A 2021; 125:10657-10666. [PMID: 34881905 DOI: 10.1021/acs.jpca.1c07596] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two variants of a successive quadratic minimization method (SQM and c-SQM) are suggested to calculate the structural properties of molecular systems at the complete basis set (CBS) limit. When applied to H3+, H2O, CH2O, SH2, and SO2, they revealed CBS/(x1, x2) structural parameters that significantly surpass the raw ones calculated at the x2 basis set level. Such a performance has also been verified for the intricate case of the water dimer. Because the c-SQM method is system specific, thus showing somewhat enhanced results relative to the general SQM protocol, it can be of higher cost depending on the level of calibration used. Yet, it hardly surpasses the general quality of the results obtained with the cost-effective SQM method. Since the number of cycles required to reach convergence is relatively small, both schemes are simple to use and easily adaptable to any of the existing extrapolation schemes for the Hartree-Fock and correlation energies.
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Affiliation(s)
- F N N Pansini
- Departamento de Física, Universidade Federal do Espírito Santo, 29075-910 Vitória, Brazil
| | - V C Mota
- Departamento de Física, Universidade Federal do Espírito Santo, 29075-910 Vitória, Brazil
| | - A J C Varandas
- Departamento de Física, Universidade Federal do Espírito Santo, 29075-910 Vitória, Brazil.,School of Physics and Physical Engineering, Qufu Normal University, 273165 Qufu, People's Republic of China.,Department of Chemistry, Coimbra Chemistry Centre, University of Coimbra, 3004-535 Coimbra, Portugal
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3
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Shepard R, Brozell SR, Larson J, Hovland P, Leyffer S. Wave function analysis with a maximum flow algorithm. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1861351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Ron Shepard
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, United States
| | - Scott R. Brozell
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, United States
| | - Jeffrey Larson
- Mathematics and Computer Science Division, Argonne National Laboratory, Lemont, IL, United States
| | - Paul Hovland
- Mathematics and Computer Science Division, Argonne National Laboratory, Lemont, IL, United States
| | - Sven Leyffer
- Mathematics and Computer Science Division, Argonne National Laboratory, Lemont, IL, United States
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4
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Lischka H, Shepard R, Müller T, Szalay PG, Pitzer RM, Aquino AJA, Araújo do Nascimento MM, Barbatti M, Belcher LT, Blaudeau JP, Borges I, Brozell SR, Carter EA, Das A, Gidofalvi G, González L, Hase WL, Kedziora G, Kertesz M, Kossoski F, Machado FBC, Matsika S, do Monte SA, Nachtigallová D, Nieman R, Oppel M, Parish CA, Plasser F, Spada RFK, Stahlberg EA, Ventura E, Yarkony DR, Zhang Z. The generality of the GUGA MRCI approach in COLUMBUS for treating complex quantum chemistry. J Chem Phys 2020; 152:134110. [PMID: 32268762 DOI: 10.1063/1.5144267] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The core part of the program system COLUMBUS allows highly efficient calculations using variational multireference (MR) methods in the framework of configuration interaction with single and double excitations (MR-CISD) and averaged quadratic coupled-cluster calculations (MR-AQCC), based on uncontracted sets of configurations and the graphical unitary group approach (GUGA). The availability of analytic MR-CISD and MR-AQCC energy gradients and analytic nonadiabatic couplings for MR-CISD enables exciting applications including, e.g., investigations of π-conjugated biradicaloid compounds, calculations of multitudes of excited states, development of diabatization procedures, and furnishing the electronic structure information for on-the-fly surface nonadiabatic dynamics. With fully variational uncontracted spin-orbit MRCI, COLUMBUS provides a unique possibility of performing high-level calculations on compounds containing heavy atoms up to lanthanides and actinides. Crucial for carrying out all of these calculations effectively is the availability of an efficient parallel code for the CI step. Configuration spaces of several billion in size now can be treated quite routinely on standard parallel computer clusters. Emerging developments in COLUMBUS, including the all configuration mean energy multiconfiguration self-consistent field method and the graphically contracted function method, promise to allow practically unlimited configuration space dimensions. Spin density based on the GUGA approach, analytic spin-orbit energy gradients, possibilities for local electron correlation MR calculations, development of general interfaces for nonadiabatic dynamics, and MRCI linear vibronic coupling models conclude this overview.
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Affiliation(s)
- Hans Lischka
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, USA
| | - Ron Shepard
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Thomas Müller
- Institute for Advanced Simulation, Jülich Supercomputing Centre, Forschungszentrum Jülich, Jülich 52428, Germany
| | - Péter G Szalay
- ELTE Eötvös Loránd University, Institute of Chemistry, Budapest, Hungary
| | - Russell M Pitzer
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, USA
| | - Adelia J A Aquino
- School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin 300072, People's Republic of China
| | | | | | - Lachlan T Belcher
- Laser and Optics Research Center, Department of Physics, US Air Force Academy, Colorado 80840, USA
| | | | - Itamar Borges
- Departamento de Química, Instituto Militar de Engenharia, Rio de Janeiro, RJ 22290-270, Brazil
| | - Scott R Brozell
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Emily A Carter
- Office of the Chancellor and Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Box 951405, Los Angeles, California 90095-1405, USA
| | - Anita Das
- Indian Institute of Engineering Science and Technology, Shibpur, Howrah, India
| | - Gergely Gidofalvi
- Department of Chemistry and Biochemistry, Gonzaga University, Spokane, Washington 99258, USA
| | - Leticia González
- Institute of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
| | - William L Hase
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, USA
| | - Gary Kedziora
- Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, USA
| | - Miklos Kertesz
- Department of Chemistry, Georgetown University, 37th and O Streets, NW, Washington, DC 20057-1227, USA
| | | | - Francisco B C Machado
- Departamento de Química, Instituto Tecnológico de Aeronáutica, São José dos Campos 12228-900, São Paulo, Brazil
| | - Spiridoula Matsika
- Department of Chemistry, Temple University, 1901 N. 13th St., Philadelphia, Pennsylvania 19122, USA
| | | | - Dana Nachtigallová
- Institute of Organic Chemistry and Biochemistry v.v.i., The Czech Academy of Sciences, Flemingovo nám. 2, 160610 Prague 6, Czech Republic
| | - Reed Nieman
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, USA
| | - Markus Oppel
- Institute of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
| | - Carol A Parish
- Department of Chemistry, Gottwald Center for the Sciences, University of Richmond, Richmond, Virginia 23173, USA
| | - Felix Plasser
- Department of Chemistry, Loughborough University, Loughborough LE11 3TU, United Kingdom
| | - Rene F K Spada
- Departamento de Física, Instituto Tecnológico de Aeronáutica, São José dos Campos 12228-900, São Paulo, Brazil
| | - Eric A Stahlberg
- Biomedical Informatics and Data Science, Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702, USA
| | - Elizete Ventura
- Universidade Federal da Paraíba, 58059-900 João Pessoa, PB, Brazil
| | - David R Yarkony
- Department of Chemistry, Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland 21218, USA
| | - Zhiyong Zhang
- Stanford Research Computing Center, Stanford University, 255 Panama Street, Stanford, California 94305, USA
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5
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Shepard R, Brozell SR, Gidofalvi G. Representations of Shavitt Graphs Within the Graphical Unitary Group Approach. J Comput Chem 2020; 41:129-135. [PMID: 31602656 DOI: 10.1002/jcc.26080] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 08/31/2019] [Indexed: 11/06/2022]
Abstract
The Shavitt graph is a visual representation of a distinct row table (DRT) within the graphical unitary group approach. The DRT is a compact representation of the entire configuration state function expansion space within a molecular electronic structure calculation. Each node of the graph is associated with an integer triple (a k ,b k ,c k ). These integers may be mapped to other quantum numbers, including the number of orbitals, number of electrons, and spin quantum number, and used to display Shavitt graphs in various ways that emphasize different aspects of the expansion space or that reveal different aspects of computed wave functions. The features of several graph density plots are discussed, including electron-hole symmetries and the bonding-antibonding wave function character. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Ron Shepard
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois, 60439
| | - Scott R Brozell
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois, 60439
| | - Gergely Gidofalvi
- Department of Chemistry and Biochemistry, Gonzaga University, 502 E. Boone Ave., Spokane, Washington, 99258-0102
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6
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Shepard R, Brozell SR. The all configuration mean energy multiconfiguration self-consistent-field method. I. Equal configuration weights. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1635275] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Ron Shepard
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA
| | - Scott R. Brozell
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA
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7
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Kirschner KN, Heiden W, Reith D. Small Alcohols Revisited: CCSD(T) Relative Potential Energies for the Minima, First- and Second-Order Saddle Points, and Torsion-Coupled Surfaces. ACS OMEGA 2018; 3:419-432. [PMID: 31457902 PMCID: PMC6641652 DOI: 10.1021/acsomega.7b01367] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 11/22/2017] [Indexed: 06/10/2023]
Abstract
The elucidation of conformations and relative potential energies (rPEs) of small molecules has a long history across a diverse range of fields. Periodically, it is helpful to revisit what conformations have been investigated and to provide a consistent theoretical framework for which clear comparisons can be made. In this paper, we compute the minima, first- and second-order saddle points, and torsion-coupled surfaces for methanol, ethanol, propan-2-ol, and propanol using consistent high-level MP2 and CCSD(T) methods. While for certain molecules more rigorous methods were employed, the CCSD(T)/aug-cc-pVTZ//MP2/aug-cc-pV5Z theory level was used throughout to provide relative energies of all minima and first-order saddle points. The rPE surfaces were uniformly computed at the CCSD(T)/aug-cc-pVTZ//MP2/aug-cc-pVTZ level. To the best of our knowledge, this represents the most extensive study for alcohols of this kind, revealing some new aspects. Especially for propanol, we report several new conformations that were previously not investigated. Moreover, two metrics are included in our analysis that quantify how the selected surfaces are similar to one another and hence improve our understanding of the relationship between these alcohols.
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Affiliation(s)
- Karl N. Kirschner
- Department
of Computer Science, Department of Electrical Engineering, Mechanical
Engineering and Technical Journalism, and Institute of Visual Computing, Bonn-Rhein-Sieg University of Applied Sciences, Grantham-Allee 20, 53757 Sankt Augustin, Germany
| | - Wolfgang Heiden
- Department
of Computer Science, Department of Electrical Engineering, Mechanical
Engineering and Technical Journalism, and Institute of Visual Computing, Bonn-Rhein-Sieg University of Applied Sciences, Grantham-Allee 20, 53757 Sankt Augustin, Germany
| | - Dirk Reith
- Department
of Computer Science, Department of Electrical Engineering, Mechanical
Engineering and Technical Journalism, and Institute of Visual Computing, Bonn-Rhein-Sieg University of Applied Sciences, Grantham-Allee 20, 53757 Sankt Augustin, Germany
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8
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Maradzike E, Gidofalvi G, Turney JM, Schaefer HF, DePrince AE. Analytic Energy Gradients for Variational Two-Electron Reduced-Density-Matrix-Driven Complete Active Space Self-Consistent Field Theory. J Chem Theory Comput 2017; 13:4113-4122. [PMID: 28731720 DOI: 10.1021/acs.jctc.7b00366] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Analytic energy gradients are presented for a variational two-electron reduced-density-matrix (2-RDM)-driven complete active space self-consistent field (CASSCF) method. The active-space 2-RDM is determined using a semidefinite programing (SDP) algorithm built upon an augmented Lagrangian formalism. Expressions for analytic gradients are simplified by the fact that the Lagrangian is stationary with respect to variations in both the primal and the dual solutions to the SDP problem. Orbital response contributions to the gradient are identical to those that arise in conventional CASSCF methods in which the electronic structure of the active space is described by a full configuration interaction (CI) wave function. We explore the relative performance of variational 2-RDM (v2RDM)- and CI-driven CASSCF for the equilibrium geometries of 20 small molecules. When enforcing two-particle N-representability conditions, full-valence v2RDM-CASSCF-optimized bond lengths display a mean unsigned error of 0.0060 Å and a maximum unsigned error of 0.0265 Å, relative to those obtained from full-valence CI-CASSCF. When enforcing partial three-particle N-representability conditions, the mean and maximum unsigned errors are reduced to only 0.0006 and 0.0054 Å, respectively. For these same molecules, full-valence v2RDM-CASSCF bond lengths computed in the cc-pVQZ basis set deviate from experimentally determined ones on average by 0.017 and 0.011 Å when enforcing two- and three-particle conditions, respectively, whereas CI-CASSCF displays an average deviation of 0.010 Å. The v2RDM-CASSCF approach with two-particle conditions is also applied to the equilibrium geometry of pentacene; optimized bond lengths deviate from those derived from experiment, on average, by 0.015 Å when using a cc-pVDZ basis set and a (22e,22o) active space.
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Affiliation(s)
- Elvis Maradzike
- Department of Chemistry and Biochemistry, Florida State University , Tallahassee, Florida 32306-4390, United States
| | - Gergely Gidofalvi
- Department of Chemistry and Biochemistry, Gonzaga University , Spokane, Washington 99258-0089, United States
| | - Justin M Turney
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - A Eugene DePrince
- Department of Chemistry and Biochemistry, Florida State University , Tallahassee, Florida 32306-4390, United States
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9
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Sellner B, Barbatti M, Müller T, Domcke W, Lischka H. Ultrafast non-adiabatic dynamics of ethylene including Rydberg states. Mol Phys 2013. [DOI: 10.1080/00268976.2013.813590] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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10
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Boguslawski K, Tecmer P, Barcza G, Legeza Ö, Reiher M. Orbital Entanglement in Bond-Formation Processes. J Chem Theory Comput 2013; 9:2959-73. [DOI: 10.1021/ct400247p] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Katharina Boguslawski
- ETH Zürich, Laboratory of Physical Chemistry, Wolfgang-Pauli-Str. 10, CH-8093 Zürich, Switzerland
| | - Paweł Tecmer
- ETH Zürich, Laboratory of Physical Chemistry, Wolfgang-Pauli-Str. 10, CH-8093 Zürich, Switzerland
| | - Gergely Barcza
- Strongly Correlated Systems ″Lendület″
Research Group, Wigner Research Center for Physics, H-1525 Budapest, Hungary
| | - Örs Legeza
- Strongly Correlated Systems ″Lendület″
Research Group, Wigner Research Center for Physics, H-1525 Budapest, Hungary
| | - Markus Reiher
- ETH Zürich, Laboratory of Physical Chemistry, Wolfgang-Pauli-Str. 10, CH-8093 Zürich, Switzerland
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11
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Sokolov AY, Wilke JJ, Simmonett AC, Schaefer HF. Analytic gradients for density cumulant functional theory: the DCFT-06 model. J Chem Phys 2012; 137:054105. [PMID: 22894330 DOI: 10.1063/1.4739423] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Density cumulant functional theory (DCFT) is one of a number of nascent electron correlation methods that are derived from reduced density matrices and cumulants thereof, instead of the wavefunction. Deriving properties from the density cumulant naturally yields methods that are size extensive and size consistent. In this work, we derive expressions for the analytic gradient, with respect to an external perturbation, for the DCFT-06 variant of density cumulant functional theory. Despite the fact that the DCFT-06 energy functional is stationary with respect to the density cumulant, the analytic gradients of the energy require the solution of perturbation-independent equations for both orbital and cumulant response. These two sets of linear response equations are coupled in nature and are solved iteratively with the solution of orbital and cumulant response equations each macroiteration, exhibiting rapid convergence. The gradients are implemented and benchmarked against coupled cluster theory with single and double excitations (CCSD) and CCSD with perturbative triple excitations [CCSD(T)], as well as accurate empirically corrected experimental data, for a test set comprising 15 small molecules. For most of the test cases, results from DCFT-06 are closer to CCSD(T) and empirical data than those from CCSD. Although the total energy and analytic gradient have the same asymptotic scaling, the present experience shows that the computational cost of the gradient is significantly lower.
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Affiliation(s)
- Alexander Yu Sokolov
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA
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13
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Bozkaya U, Turney JM, Yamaguchi Y, Schaefer HF. The lowest-lying electronic singlet and triplet potential energy surfaces for the HNO–NOH system: Energetics, unimolecular rate constants, tunneling and kinetic isotope effects for the isomerization and dissociation reactions. J Chem Phys 2012; 136:164303. [DOI: 10.1063/1.4704895] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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14
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West AC, Lynch JD, Sellner B, Lischka H, Hase WL, Windus TL. O + C2H4 potential energy surface: excited states and biradicals at the multireference level. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1123-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Szalay PG, Müller T, Gidofalvi G, Lischka H, Shepard R. Multiconfiguration Self-Consistent Field and Multireference Configuration Interaction Methods and Applications. Chem Rev 2011; 112:108-81. [DOI: 10.1021/cr200137a] [Citation(s) in RCA: 470] [Impact Index Per Article: 36.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Péter G. Szalay
- Laboratory for Theoretical Chemistry, Institute of Chemistry, Eötvös Loránd University, P. O. Box 32, H-1518 Budapest, Hungary
| | - Thomas Müller
- Jülich Supercomputer Centre, Institute of Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Gergely Gidofalvi
- Department of Chemistry and Biochemistry, Gonzaga University, 502 East Boone Avenue, Spokane, Washington 99258-0102, United States
| | - Hans Lischka
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, United States
- Institute for Theoretical Chemistry, University of Vienna, Waehringerstrasse 17, A-1090 Vienna, Austria
| | - Ron Shepard
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
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16
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Mahapatra US, Chattopadhyay S. Evaluation of the performance of single root multireference coupled cluster method for ground and excited states, and its application to geometry optimization. J Chem Phys 2011; 134:044113. [DOI: 10.1063/1.3523573] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Lischka H, Müller T, Szalay PG, Shavitt I, Pitzer RM, Shepard R. Columbus—a program system for advanced multireference theory calculations. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2011. [DOI: 10.1002/wcms.25] [Citation(s) in RCA: 134] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hans Lischka
- Institute for Theoretical Chemistry, University of Vienna, Vienna, Austria
| | - Thomas Müller
- Institute of Advanced Simulation, Jülich Supercomputer Centre, Jülich, Germany
| | - Péter G. Szalay
- Laboratory for Theoretical Chemistry, Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary
| | - Isaiah Shavitt
- Department of Chemistry, University of Illinois, Urbana, IL, USA
| | - Russell M. Pitzer
- Department of Chemistry, The Ohio State University, Columbus, OH, USA
| | - Ron Shepard
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL, USA
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18
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Ignatyev I, Montejo M, Ortega PGR, González JJL. Effect of substituents and hydrogen bonding on barrier heights in dehydration reactions of carbon and silicon geminal diols. Phys Chem Chem Phys 2011; 13:18507-15. [DOI: 10.1039/c1cp21580a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Ruckenbauer M, Barbatti M, Sellner B, Muller T, Lischka H. Azomethane: Nonadiabatic Photodynamical Simulations in Solution. J Phys Chem A 2010; 114:12585-90. [DOI: 10.1021/jp108844g] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthias Ruckenbauer
- Institute for Theoretical Chemistry, University of Vienna, Waehringerstrasse 17, 1090 Vienna, Austria, Max Plank Institute fuer Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Muelheim, Germany, and Institute for Advanced Simulation, Research Center Jülich, 53425 Juelich, Germany
| | - Mario Barbatti
- Institute for Theoretical Chemistry, University of Vienna, Waehringerstrasse 17, 1090 Vienna, Austria, Max Plank Institute fuer Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Muelheim, Germany, and Institute for Advanced Simulation, Research Center Jülich, 53425 Juelich, Germany
| | - Bernhard Sellner
- Institute for Theoretical Chemistry, University of Vienna, Waehringerstrasse 17, 1090 Vienna, Austria, Max Plank Institute fuer Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Muelheim, Germany, and Institute for Advanced Simulation, Research Center Jülich, 53425 Juelich, Germany
| | - Thomas Muller
- Institute for Theoretical Chemistry, University of Vienna, Waehringerstrasse 17, 1090 Vienna, Austria, Max Plank Institute fuer Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Muelheim, Germany, and Institute for Advanced Simulation, Research Center Jülich, 53425 Juelich, Germany
| | - Hans Lischka
- Institute for Theoretical Chemistry, University of Vienna, Waehringerstrasse 17, 1090 Vienna, Austria, Max Plank Institute fuer Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Muelheim, Germany, and Institute for Advanced Simulation, Research Center Jülich, 53425 Juelich, Germany
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20
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Karton A, Martin JML. Performance of W4 theory for spectroscopic constants and electrical properties of small molecules. J Chem Phys 2010; 133:144102. [DOI: 10.1063/1.3489113] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Gidofalvi G, Shepard R. Exploiting sparsity in the graphically contracted function configuration interaction method. Mol Phys 2010. [DOI: 10.1080/00268976.2010.521779] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Gergely Gidofalvi
- a Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL, 60439
| | - Ron Shepard
- a Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , IL, 60439
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22
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Chattopadhyay S, Mahapatra US, Chaudhuri RK. Study of equilibrium geometries of diradicaloid systems via state specific multireference Møller–Plesset perturbation theory (SS-MRMPPT). Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.02.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sinha Mahapatra U, Chattopadhyay S, Chaudhuri RK. Study of the Ground State Dissociation of Diatomic Molecular Systems Using State-Specific Multireference Perturbation Theory: A Brillouin−Wigner Scheme. J Chem Theory Comput 2010; 6:662-82. [DOI: 10.1021/ct900452n] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Uttam Sinha Mahapatra
- Department of Physics, Taki Government College, Taki, North 24 Parganas-743429, India
| | - Sudip Chattopadhyay
- Department of Chemistry, Bengal Engineering and Science University, Shibpur, Howrah 711103, India
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Sinha Mahapatra U, Chattopadhyay S, Chaudhuri RK. Second-Order State-Specific Multireference Møller−Plesset Perturbation Theory (SS-MRMPPT) Applied to Geometry Optimization. J Phys Chem A 2010; 114:3668-82. [DOI: 10.1021/jp911581f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Uttam Sinha Mahapatra
- Department of Physics, Taki Government College, Taki, North 24
Parganas-743429, India
| | - Sudip Chattopadhyay
- Department of Chemistry, Bengal Engineering and Science University,
Shibpur, Howrah 711103, India
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Large-Scale Parallel Uncontracted Multireference-Averaged Quadratic Coupled Cluster: The Ground State of the Chromium Dimer Revisited. J Phys Chem A 2009; 113:12729-40. [DOI: 10.1021/jp905254u] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sellner B, Barbatti M, Lischka H. Dynamics starting at a conical intersection: Application to the photochemistry of pyrrole. J Chem Phys 2009; 131:024312. [DOI: 10.1063/1.3175799] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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