1
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Leclerc A, Jolicard G. Calculating eigenvalues and eigenvectors of parameter-dependent Hamiltonians using an adaptative wave operator method. J Chem Phys 2020; 152:204107. [DOI: 10.1063/5.0008947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Arnaud Leclerc
- Université de Lorraine, CNRS, LPCT, F-57000 Metz, France
| | - Georges Jolicard
- Institut UTINAM UMR CNRS 6213, Observatoire de Besançon, 25010 Besançon Cedex, France
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2
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Pouchan C. Quantum molecular dynamic approach to modeling the vibrational spectra of propynenitrile and its 1:1 complexes with water. COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2019.06.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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3
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Puzzarini C, Bloino J, Tasinato N, Barone V. Accuracy and Interpretability: The Devil and the Holy Grail. New Routes across Old Boundaries in Computational Spectroscopy. Chem Rev 2019; 119:8131-8191. [DOI: 10.1021/acs.chemrev.9b00007] [Citation(s) in RCA: 114] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Cristina Puzzarini
- Dipartimento di Chimica “Giacomo Ciamician”, Università di Bologna, Via F. Selmi 2, I-40126 Bologna, Italy
| | - Julien Bloino
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| | - Nicola Tasinato
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| | - Vincenzo Barone
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
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4
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Erba A, Maul J, Ferrabone M, Dovesi R, Rérat M, Carbonnière P. Anharmonic Vibrational States of Solids from DFT Calculations. Part II: Implementation of the VSCF and VCI Methods. J Chem Theory Comput 2019; 15:3766-3777. [DOI: 10.1021/acs.jctc.9b00294] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alessandro Erba
- Dipartimento di Chimica, Universitá di Torino, via Giuria 5, 10125 Torino, Italy
| | - Jefferson Maul
- Dipartimento di Chimica, Universitá di Torino, via Giuria 5, 10125 Torino, Italy
| | - Matteo Ferrabone
- Dipartimento di Chimica, Universitá di Torino, via Giuria 5, 10125 Torino, Italy
| | - Roberto Dovesi
- Dipartimento di Chimica, Universitá di Torino, via Giuria 5, 10125 Torino, Italy
| | - Michel Rérat
- IPREM, Université de Pau et des Pays de l’Adour, IPREM-CAPT UMR CNRS 5254, Hélioparc Pau Pyrénées, 2 avenue du Président Angot, 64053 PAU CEDEX 9, Pau, France
| | - Philippe Carbonnière
- IPREM, Université de Pau et des Pays de l’Adour, IPREM-CAPT UMR CNRS 5254, Hélioparc Pau Pyrénées, 2 avenue du Président Angot, 64053 PAU CEDEX 9, Pau, France
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5
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Nauts A, Lauvergnat D. Numerical on-the-fly implementation of the action of the kinetic energy operator on a vibrational wave function: application to methanol. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1473652] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- André Nauts
- Institute of Condensed Matter and Nanosciences (NAPS), Université Catholique de Louvain, Louvain-la-Neuve, Belgium
- Laboratoire de Chimie Physique, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Orsay, France
| | - David Lauvergnat
- Laboratoire de Chimie Physique, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Orsay, France
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6
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Carrington T. Perspective: Computing (ro-)vibrational spectra of molecules with more than four atoms. J Chem Phys 2017; 146:120902. [DOI: 10.1063/1.4979117] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Tucker Carrington
- Chemistry Department, Queen’s University, Kingston, Ontario
K7L 3N6, Canada
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7
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Leclerc A, Thomas PS, Carrington T. Comparison of different eigensolvers for calculating vibrational spectra using low-rank, sum-of-product basis functions. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1249980] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Arnaud Leclerc
- Université de Lorraine , UMR CNRS 7565 SRSMC, Metz, France
| | - Phillip S. Thomas
- Chemistry Department, Queen's University , Kingston, Ontario, Canada
| | - Tucker Carrington
- Chemistry Department, Queen's University , Kingston, Ontario, Canada
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8
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Lauvergnat D, Luis JM, Kirtman B, Reis H, Nauts A. Numerical and exact kinetic energy operator using Eckart conditions with one or several reference geometries: Application to HONO. J Chem Phys 2016; 144:084116. [DOI: 10.1063/1.4942172] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Leclerc A, Carrington T. Using symmetry-adapted optimized sum-of-products basis functions to calculate vibrational spectra. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2015.11.057] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Avila G, Carrington T. A multi-dimensional Smolyak collocation method in curvilinear coordinates for computing vibrational spectra. J Chem Phys 2015; 143:214108. [DOI: 10.1063/1.4936294] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Gustavo Avila
- Chemistry Department, Queen’s University, Kingston, Ontario K7L 3N6, Canada
| | - Tucker Carrington
- Chemistry Department, Queen’s University, Kingston, Ontario K7L 3N6, Canada
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11
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Abstract
I review two new ideas for coping with the size of large product basis sets and large product grids when one computes vibrational energy levels. The first is based on a tensor reduction scheme. It exploits advantages of a sum-of-products potential. The key idea is to use a basis each of whose function is a sum of optimized products and to compress the number of terms in each basis function. When the potential does not have the sum-of-products form, it is usually necessary to use quadrature. The second idea uses a nondirect product grid that has structure and is therefore compatible with efficient matrix–vector products.
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Affiliation(s)
- Tucker Carrington
- Chemistry Department, Queen’s University, Kingston, ON K7L 3N6, Canada
- Chemistry Department, Queen’s University, Kingston, ON K7L 3N6, Canada
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12
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Wang XG, Carrington T. Rovibrational levels and wavefunctions of Cl−H2O. J Chem Phys 2014; 140:204306. [DOI: 10.1063/1.4875798] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Brown J, Wang XG, Carrington T, Grubbs GS, Dawes R. Computational study of the rovibrational spectrum of CO2–CS2. J Chem Phys 2014; 140:114303. [DOI: 10.1063/1.4867792] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Dawes R, Wang XG, Carrington T. CO Dimer: New Potential Energy Surface and Rovibrational Calculations. J Phys Chem A 2013; 117:7612-30. [DOI: 10.1021/jp404888d] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Richard Dawes
- Department
of Chemistry, Missouri University of Science and Technology, Rolla,
Missouri 65409, United States
| | - Xiao-Gang Wang
- Chemistry Department, Queen’s University, Kingston, Ontario K7L 3N6,
Canada
| | - Tucker Carrington
- Chemistry Department, Queen’s University, Kingston, Ontario K7L 3N6,
Canada
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15
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Wang XG, Carrington T. Computing rovibrational levels of methane with curvilinear internal vibrational coordinates and an Eckart frame. J Chem Phys 2013; 138:104106. [DOI: 10.1063/1.4793474] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Avila G, Carrington T. Solving the vibrational Schrödinger equation using bases pruned to include strongly coupled functions and compatible quadratures. J Chem Phys 2012; 137:174108. [DOI: 10.1063/1.4764099] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [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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Zhang Z, Li B, Shen Z, Ren Y, Bian W. Efficient quantum calculation of the vibrational states of acetylene. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2012.01.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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18
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Christiansen O. Selected new developments in vibrational structure theory: potential construction and vibrational wave function calculations. Phys Chem Chem Phys 2012; 14:6672-87. [DOI: 10.1039/c2cp40090a] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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19
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Lauvergnat D, Senent ML, Jutier L, Hochlaf M. Explicitly correlated treatment of H2NSi and H2SiN radicals: Electronic structure calculations and rovibrational spectra. J Chem Phys 2011; 135:074301. [DOI: 10.1063/1.3624563] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Avila G, Carrington T. Using a pruned basis, a non-product quadrature grid, and the exact Watson normal-coordinate kinetic energy operator to solve the vibrational Schrödinger equation for C2H4. J Chem Phys 2011; 135:064101. [DOI: 10.1063/1.3617249] [Citation(s) in RCA: 109] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Vázquez J, Harding ME, Stanton JF, Gauss J. Vibrational Energy Levels via Finite-Basis Calculations Using a Quasi-Analytic Form of the Kinetic Energy. J Chem Theory Comput 2011; 7:1428-42. [DOI: 10.1021/ct100711u] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Juana Vázquez
- Center for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, United States
- Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
| | - Michael E. Harding
- Center for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, United States
- Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
| | - John F. Stanton
- Center for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Jürgen Gauss
- Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany
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22
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Avila G, Carrington T. Using nonproduct quadrature grids to solve the vibrational Schrödinger equation in 12D. J Chem Phys 2011; 134:054126. [DOI: 10.1063/1.3549817] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Bomble L, Lauvergnat D, Remacle F, Desouter-Lecomte M. Controlled full adder-subtractor by vibrational computing. Phys Chem Chem Phys 2010; 12:15628-35. [PMID: 20661490 DOI: 10.1039/c003687k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The implementation of a quantum-controlled full adder-subtractor of two binary digits and of a "carry in" or a "borrow in" is simulated by encoding four qubits in the vibrational eigenstates of a tetra-atomic molecule (trans-HONO). The laser field of the gate is computed using optimal control theory by treating dynamics in full dimensionality. A controlled qubit enforces the addition or the subtraction. The global unitary transformation that connects the inputs to the outputs is driven by a single laser pulse. This decreases the duration of the operation and allows for a better use of the optical resources and for an improvement of the fidelity (>97%). Initialization and reading out are discussed. The timescale of the sequence initialization, gate and read out is<100 ps.
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Affiliation(s)
- Laëtitia Bomble
- Laboratoire de Chimie Physique, Université de Paris-Sud, UMR8000, Orsay, F-91405, France
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24
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Bégué D, Labéguerie P, Zhang-Negrerie DY, Avramopoulos A, Serrano-Andrés L, Papadopoulos MG. Theoretical investigations of the IR spectroscopy of Ni(C2S2H2)2. A case study of the P_VMWCI2 algorithm including anharmonic effects. Phys Chem Chem Phys 2010; 12:13746-51. [DOI: 10.1039/c0cp00760a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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25
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Carbonnière P, Dargelos A, Pouchan C. The VCI-P code: an iterative variation–perturbation scheme for efficient computations of anharmonic vibrational levels and IR intensities of polyatomic molecules. Theor Chem Acc 2009. [DOI: 10.1007/s00214-009-0689-7] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Győrffy W, Seidler P, Christiansen O. Solving the eigenvalue equations of correlated vibrational structure methods: Preconditioning and targeting strategies. J Chem Phys 2009; 131:024108. [DOI: 10.1063/1.3154382] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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27
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Lauvergnat D, Hochlaf M. Theoretical spectroscopy of trans-HNNH+ and isotopomers. J Chem Phys 2009; 130:224312. [DOI: 10.1063/1.3154141] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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28
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Pouchan C, Carbonniere P. Advantages and Drawbacks of Quantum Mechanical Static and Dynamic Approaches to Modelling Infrared Spectra. CHINESE J CHEM PHYS 2009. [DOI: 10.1088/1674-0068/22/02/123-128] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Wang XG, Carrington T. A discrete variable representation method for studying the rovibrational quantum dynamics of molecules with more than three atoms. J Chem Phys 2009; 130:094101. [DOI: 10.1063/1.3077130] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
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30
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Carbonniere P, Dargelos A, Ciofini I, Adamo C, Pouchan C. Vibrational analysis of glycine radical: a comparative ab initio static and dynamic study. Phys Chem Chem Phys 2009; 11:4375-84. [DOI: 10.1039/b817468g] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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31
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Khater B, Guillemin JC, Benidar A, Bégué D, Pouchan C. Vinylphosphine-borane: Synthesis, gas phase infrared spectroscopy, and quantum chemical vibrational calculations. J Chem Phys 2008; 129:224308. [DOI: 10.1063/1.3035902] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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32
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Barnes GL, Sibert EL. The effects of asymmetric motions on the tunneling splittings in formic acid dimer. J Chem Phys 2008; 129:164317. [DOI: 10.1063/1.3000102] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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33
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Bégué D, Gohaud N, Pouchan C, Cassam-Chenaï P, Liévin J. A comparison of two methods for selecting vibrational configuration interaction spaces on a heptatomic system: ethylene oxide. J Chem Phys 2008; 127:164115. [PMID: 17979327 DOI: 10.1063/1.2795711] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Two recently developed methods for solving the molecular vibrational Schrodinger equation, namely, the parallel vibrational multiple window configuration interaction and the vibrational mean field configuration interaction, are presented and compared on the same potential energy surface of ethylene oxide, c-C(2)H(4)O. It is demonstrated on this heptatomic system with strong resonances that both approaches converge towards the same fundamental frequencies. This confirms their ability to tackle the vibrational problem of large molecules for which full configuration interaction calculations are not tractable.
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Affiliation(s)
- Didier Bégué
- Institut Pluridisciplinaire en Recherche sur l'Environnement et les Matériaux, UMR-5254-CNRS, Equipe de Chimie-Physique, IFR, rue Jules Ferry, BP 27540, F-64075 PAU, Cedex, France.
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34
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Barnes GL, Squires SM, Sibert EL. Symmetric Double Proton Tunneling in Formic Acid Dimer: A Diabatic Basis Approach. J Phys Chem B 2007; 112:595-603. [DOI: 10.1021/jp075376e] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- George L. Barnes
- Department of Chemistry and Theoretical Chemistry Institute, University of WisconsinMadison, Madison, Wisconsin 53706
| | - Shane M. Squires
- Department of Chemistry and Theoretical Chemistry Institute, University of WisconsinMadison, Madison, Wisconsin 53706
| | - Edwin L. Sibert
- Department of Chemistry and Theoretical Chemistry Institute, University of WisconsinMadison, Madison, Wisconsin 53706
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35
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Benidar A, Guillemin JC, Bégué D, Pouchan C. Vibrational Spectra of Cyclopentadienylphosphine: Infrared and Theoretical Studies from DFT Anharmonic Potentials. J Phys Chem A 2007; 111:10961-8. [DOI: 10.1021/jp074244i] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Jean-Claude Guillemin
- Sciences Chimiques de Rennes, Ecole Nationale Supérieure de Chimie de Rennes-CNRS, 35700 Rennes, France
| | - Didier Bégué
- Université de Pau et des Pays de l'Adour, UMR 5254, Institut Pluridisciplinaire sur l'Environnement et les Matériaux Equipe de Chimie Physique (ECP), Chimie Théorique et Réactivité (CTR) IFR, rue Jules Ferry, BP 27540, 64075 Pau, France
| | - Claude Pouchan
- Université de Pau et des Pays de l'Adour, UMR 5254, Institut Pluridisciplinaire sur l'Environnement et les Matériaux Equipe de Chimie Physique (ECP), Chimie Théorique et Réactivité (CTR) IFR, rue Jules Ferry, BP 27540, 64075 Pau, France
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36
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Iung C, Pasin G. Variational Calculation of Specific, Highly Excited Vibrational States in DFCO: Comparison with Experimental Data. J Phys Chem A 2007; 111:10426-33. [PMID: 17880188 DOI: 10.1021/jp0734272] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A stimulated emission pumping spectra of jet-cooled DFCO performed by Crane et al. (J. Mol. Spectrosc. 1997, 183, 273) has provided a great number of ro-vibrational lines up to 9000 cm(-1) of excitation energy. By combining a Jacobi-Wilson (JW) approach with a Davidson scheme, we calculate the lines provided by the experiment up to 9000 cm(-1) using an ab initio global potential energy surface (PES) developed by Kato et al. (J. Chem. Phys. 1997, 107, 6114). Comparisons between experimental and calculated data provide a critical test of the quality of the PES used. We show that the variational calculated energies can be efficiently corrected by taking into account the error observed for the A' fundamental transitions nu(i) (i = 1, ..., 5) and the first overtone 2nu(6). A detailed analysis of the eigenstates obtained by the calculation allows one to quantify the coupling between the different modes. Such an information is essential to understand and predict the energy flow through a DFCO molecule that is initially excited.
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Affiliation(s)
- Christophe Iung
- Equipe de Chimie Théorique, Méthodologies et Modélisation, Institut Gerhardt, UMR 5253 CNRS-UMII-ENSCM, CC 014, Université Montpellier II 34095 Montpellier Cedex 05, France.
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37
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Recursive Solutions to Large Eigenproblems in Molecular Spectroscopy and Reaction Dynamics. REVIEWS IN COMPUTATIONAL CHEMISTRY 2007. [DOI: 10.1002/9780470189078.ch7] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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38
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Begue D, Pouchan C. Vibrational anharmonic calculations in solution: Performance of various DFT approaches. J Comput Chem 2007; 28:1456-62. [PMID: 17334984 DOI: 10.1002/jcc.20693] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
We report anharmonic spectra calculated for formaldehyde in acetonitrile solution using the quartic force field obtained for various DFT/solvent coupled models. A statistical study has been carried out for each mode by using several classes of DFT functionals and comparing them to the reference ab-initio CCSD(T)/cc-pVQZ calculations. Results lead to the recommended use of hybrid functionals associated with the 6-31+G** basis set and the Polarized Continuum model (PCM) to predict the expected shifts relative to the gas phase.
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Affiliation(s)
- Didier Begue
- Laboratoire de Chimie Théorique et Physico-Chimie Moléculaire, UMR 5624-Fédération de Recherche IPREM 2606, Université de Pau et des Pays de l'Adour, 64075 Pau Cedex, France.
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39
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Karlsson HO. Calculation of highly excited vibrational states using a Richardson-Leja-Davidson scheme. J Chem Phys 2007; 126:084105. [PMID: 17343438 DOI: 10.1063/1.2646409] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
An efficient computational scheme for calculating highly excited vibrational eigenstates is proposed, combining a Richardson-Leja spectral filter with a novel version of the Davidson method [J. Comput. Phys. 17, 87 (1975)]. Highly excited eigenstates of the Rb2 and H2O molecules are computed to test and verify the method. On the average less than 2.5 outer recursions per eigenstate are needed. For each outer Davidson recursion, less than 20 inner filter recursions per eigenstate are needed on the average.
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Affiliation(s)
- Hans O Karlsson
- Quantum Chemistry, Department of Physical and Analytical Chemistry, Uppsala University, Box 518, SE-751 20 Uppsala, Sweden
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40
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Pasin G, Iung C, Gatti F, Meyer HD. Theoretical investigation of highly excited vibrational states in DFCO: Calculation of the out-of-plane bending states and simulation of the intramolecular vibrational energy redistribution. J Chem Phys 2007; 126:024302. [PMID: 17228949 DOI: 10.1063/1.2402920] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A previously developed modified Davidson scheme [C. Iung and F. Ribeiro, J. Chem. Phys. 121, 174105 (2005)] is applied to compute and analyze highly excited (nu2,nu6) eigenstates in DFCO. The present paper is also devoted to the simulations of the intramolecular vibrational energy redistribution (IVR) initiated by an excitation of the out-of-plane bending vibration (nnu6, n=2,4,6, . . . ,18, and 20). The multiconfiguration time-dependent Hartree method is exploited to propagate the corresponding six-dimensional wave packets. A comprehensive comparison with experimental data as well as with previous simulations of IVR in HFCO [G. Pasin et al. J. Chem. Phys. 124, 194304 (2006)] is presented.
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Affiliation(s)
- Gauthier Pasin
- Equipe de Chimie Théorique Méthodologies et Modélisations, Institut Gerhardt, UMR 5253 CNRS-UM II-ENSCM, CC 014, Université Montpellier II, F-34095 Montpellier, Cedex 05, France.
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Begue D, Elissalde S, Pere E, Iratcabal P, Pouchan C. New Theoretical and Experimental Infrared Results on Formaldehyde in Solution. J Phys Chem A 2006; 110:7793-800. [PMID: 16789764 DOI: 10.1021/jp061572u] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An extension of our combined procedure to determine a complete quartic force field and to resolve a vibrational problem thanks to a variational treatment is proposed for quantitative calculations of vibrational spectra in solution. Energies and gradients are obtained through a polarizable continuum model (PCM), the so-called self-consistent isodensity (SCI)-PCM. We present in this paper new experimental results dealing with formaldehyde in solution in cyclohexane, chloroform, THF, acetonitrile, DMSO and water; the obtained vibrational spectra are then compared with CCSD(T)/cc-pVQZ calculations. In addition, density functional theory (DFT) calculations have been carried out with the aim of both anticipating and positioning these approaches for larger sized molecules.
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Affiliation(s)
- Didier Begue
- Laboratoire de Chimie Théorique et Physico-Chimie Moléculaire UMR 5624, Fédération de Recherche IPREM 2606, Université de Pau et des Pays de l'Adour, France.
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Pasin G, Gatti F, Iung C, Meyer HD. Theoretical investigation of intramolecular vibrational energy redistribution in highly excited HFCO. J Chem Phys 2006; 124:194304. [PMID: 16729811 DOI: 10.1063/1.2192499] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The present paper is devoted to the simulations of the intramolecular vibrational energy redistribution (IVR) in HFCO initiated by an excitation of the out-of-plane bending vibration [nnu(6)=2,4,6,...,18,20]. Using a full six-dimensional ab initio potential energy, the multiconfiguration time-dependent Hartree (MCTDH) method was exploited to propagate the corresponding six-dimensional wave packets. This study emphasizes the stability of highly excited states of the out-of-plane bending mode which exist even above the dissociation threshold. More strikingly, the structure of the IVR during the first step of the dynamics is very stable for initial excitations ranging from 2nu(6) to 20nu(6). This latter result is consistent with the analysis of the eigenstates obtained, up to 10nu(6), with the aid of the Davidson algorithm in a foregoing paper [Iung and Ribeiro, J. Chem. Phys. 121, 174105 (2005)]. The present study can be considered as complementary to this previous investigation. This paper also shows how MCTDH can be used to predict the dynamical behavior of a strongly excited system and to determine the energies of the corresponding highly excited states.
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Affiliation(s)
- Gauthier Pasin
- LSDSMS (UMR 5636-CNRS), CC 014, Université Montpellier II, F-34095 Montpellier Cedex 05, France.
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Iung C, Ribeiro F, Sibert EL. Comparison of Perturbative and Variational Treatments of Molecular Vibrations: Application to the Vibrational Spectrum of HFCO up to 8000 cm-1†. J Phys Chem A 2006; 110:5420-9. [PMID: 16623470 DOI: 10.1021/jp056937+] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We calculated highly excited states of the HFCO molecule, comparing results from two methods. In the first method, Van Vleck perturbation theory is used to transform away all off-diagonal couplings except those between nearly degenerate states. This perturbative transformation leads to a matrix representation where eigenvalues are obtained with relatively small matrices. In the second method, variational eigenvalues are obtained by combining the Jacobi-Wilson approach with the block-Davidson scheme. The key ingredient here is a prediagonalized-perturbative scheme applied to a subspace of a curvilinear normal-mode basis set. Comparisons of the two methods provide a critical test of the less time-consuming perturbation theory. Two different coordinate sets are used to test the sensitivity of the results to coordinate choice. Perturbation theory also requires a polynomial fit to the potential. The implications of this restriction are investigated.
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Affiliation(s)
- Christophe Iung
- Laboratoire de Structure et Dynamique des Systèmes Moléculaires et Solides (LSDSMS) Unité Mixte de Recherche (UMR-CNRS 5636)-CC 014, Université Montpellier II, 34095 Montpellier, Cedex 05, France.
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Sprague MM, Ramesh SG, Sibert EL. Combination of perturbative and variational methods for calculating molecular spectra: Calculation of the υ=3–5 CH stretch overtone spectrum of CHF3. J Chem Phys 2006; 124:114307. [PMID: 16555888 DOI: 10.1063/1.2178297] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Highly excited states of the CHF3 molecule belonging to the third, fourth, and fifth Fermi polyad are calculated using a combination of the Van Vleck perturbation theory and a variational treatment. The perturbation theory preconditions the Hamiltonian matrix by transforming away all couplings except those between nearly degenerate states. This transformation is implemented so that eigenvalues can be found with significantly smaller matrices than that which would be needed in the original normal mode representation. Even with preconditioning, at the energies as high as 3-5 quanta in the CH stretch, it is not possible to directly diagonalize the Hamiltonian matrix due to the large basis sets required. Iterative methods, particularly the block-Davidson method, are explored for finding the eigenvalues. The methods are compared and the advantages discussed.
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Affiliation(s)
- Megan M Sprague
- Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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Iung C, Ribeiro F. Calculation of specific, highly excited vibrational states based on a Davidson scheme: Application to HFCO. J Chem Phys 2005; 123:174105. [PMID: 16375515 DOI: 10.1063/1.2101457] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We present the efficiency of a new modified Davidson scheme which yields selectively one high-energy vibrationally excited eigenstate or a series of eigenstates. The calculation of a highly vibrationally excited state psi located in a dense part of the spectrum requires a specific prediagonalization step before the Davidson scheme. It consists in building a small active space P containing the zero-order states which are coupled with the zero-order description of the eigenstate of interest. We propose a general way to define this active space P which plays a crucial role in the method. The efficiency of the method is illustrated by computing and analyzing the high-energy excited overtones of the out-of-plane mode [formula: see text] in HFCO. These overtone energies correspond to the 234th, 713th, and 1774th energy levels in our reference basis set which contains roughly 140,000 states. One of the main advantages of this Davidson scheme comes from the fact that the eigenstate and eigenvalue convergence can be assessed during the iterations by looking at the residual [formula: see text]. The maximum value epsilon allowed for this residual constitutes a very sensitive and efficient parameter which sets the accuracy of the eigenvalues and eigenstates, even when the studied states are highly excited and are localized in a dense part of the spectrum. The physical analysis of the eigenstates associated with the 5th, 7th, and 9th out-of-plane overtones in HFCO provides some interesting information on the energy localization in this mode and on the role played by the in-plane modes. Also, it provides some ideas on the numerical methods which should be developed in the future to tackle higher-energy excited states in polyatomics.
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Affiliation(s)
- Christophe Iung
- LSDSMS (UMR 5636), CC 014, Université Montpellier II, 34095 Montpellier Cedex 05, France.
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