1
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Alves MO, Mota VC, Braga JP, Varandas AJC, Guo H, Galvão BRL. High-accuracy DMBE potential energy surface for CNO(A''4) and the rate coefficients for the C + NO reaction in the A'2, A''2, and A''4 states. J Chem Phys 2023; 159:214307. [PMID: 38054514 DOI: 10.1063/5.0180918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 11/13/2023] [Indexed: 12/07/2023] Open
Abstract
An accurate potential energy surface (PES) for the lowest lying A''4 state of the CNO system is presented based on explicitly correlated multi-reference configuration interaction calculations with quadruple zeta basis set (MRCI-F12/cc-pVQZ-F12). The ab initio energies are fitted using the double many-body expansion method, thus incorporating long-range energy terms that can accurately describe the electrostatic and dispersion interactions with physically motivated decaying functions. Together with the previously fitted lowest A'2 and A''2 states using the same theoretical framework, this constitutes a new set of PESs that are suitable to predict rate coefficients for all atom-diatom reactions of the CNO system. We use this set of PESs to calculate thermal rate coefficients for the C(P3) + NO(Π2) reaction and compare the temperature dependence and product branching ratios with experimental results. The comparison between theory and experiment is shown to be improved over previous theoretical studies. We highlight the importance of the long-range interactions for low-temperature rate coefficients.
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Affiliation(s)
- Márcio O Alves
- Centro Federal de Educação Tecnológica de Minas Gerais, CEFET-MG, Av. Amazonas 5253, 30421-169 Belo Horizonte, Minas Gerais, Brazil
| | - Vinícius C Mota
- Departamento de Física, Universidade Federal do Espírito Santo, 29075-910 Vitória, Brazil
| | - João P Braga
- Departamento de Química, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, Brazil
| | - António J C Varandas
- Departamento de Física, Universidade Federal do Espírito Santo, 29075-910 Vitória, Brazil
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, People's Republic of China
- Coimbra Chemistry Centre and Chemistry Department, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
- Center for Computational Chemistry, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - Breno R L Galvão
- Centro Federal de Educação Tecnológica de Minas Gerais, CEFET-MG, Av. Amazonas 5253, 30421-169 Belo Horizonte, Minas Gerais, Brazil
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
- Center for Computational Chemistry, University of New Mexico, Albuquerque, New Mexico 87131, USA
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2
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Mota VC, Caridade PJSB, Varandas AJC, Galvão BRL. Quasiclassical Trajectory Study of the Si + SH Reaction on an Accurate Double Many-Body Expansion Potential Energy Surface. J Phys Chem A 2022; 126:3555-3568. [PMID: 35612827 DOI: 10.1021/acs.jpca.2c01633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An accurate potential energy surface (PES) for the HSiS system based on MRCI+Q calculations extrapolated to the complete basis set limit is presented. Modeled with the double many-body expansion (DMBE) method, the PES provides an accurate description of the long-range interactions, including electrostatic and dispersion terms decaying as R-4, R-5, R-6, R-8, R-10 that are predicted from dipole moments, quadrupole moments, and dipolar polarizabilities, which are also calculated at the MRCI+Q level. The novel PES is then used in quasiclassical trajectory calculations to predict the rate coefficients of the Si + SH → SiS + H reaction, which has been shown to be a major source of the SiS in certain regions of the interstellar medium. An account of the zero-point energy leakage based on various nonactive models is also given. It is shown that the reaction is dominated by long-range forces, with the mechanism Si + SH → SiSH → SSiH → SiS + H being the most important one for all temperatures studied. Although SSiH corresponds to the global minimum of the PES, the contribution from the direct reaction Si + SH → SSiH → SiS + H is less than 0.5% for temperatures higher than 500 K. The rovibrational distributions of the products are calculated using the momentum Gaussian binning method and show that as the temperature is increased the average vibrational quantum number decreases while the rotational distribution spreads up to larger values.
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Affiliation(s)
- V C Mota
- Departamento de Física, Universidade Federal do Espírito Santo, 29075-910Vitória, Brazil
| | - P J S B Caridade
- Coimbra Chemistry Centre and Chemistry Department, University of Coimbra, 3004-535Coimbra, Portugal
| | - A J C Varandas
- Departamento de Física, Universidade Federal do Espírito Santo, 29075-910Vitória, Brazil.,Coimbra Chemistry Centre and Chemistry Department, University of Coimbra, 3004-535Coimbra, Portugal.,School of Physics and Physical Engineering, Qufu Normal University, Qufu273165, P. R. China
| | - B R L Galvão
- Centro Federal de Educação Tecnológica de Minas Gerais, CEFET-MG, Av. Amazonas 5253, 30421-169Belo Horizonte-MG, Brazil
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3
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Chen J, Zhang C, Lü Y, Wang H, Li Y. Globally Accurate Potential Energy Surface for BH 2+2(1 3A') Using the Switching Function Formalism. J Phys Chem A 2021; 126:53-60. [PMID: 34965124 DOI: 10.1021/acs.jpca.1c08974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A great number of ab initio energy points are calculated using the aug-cc-pV(Q,5)Z basis sets at the multireference configuration interaction level and extrapolated to the complete basis set limit. An exact three-dimensional potential energy surface of the ground-state BH2+ is obtained. A switching function is developed to model the transition of B+(3P) to B+(1S) to guarantee the reliable behavior at B+(3P) + H2(X1∑g+) and BH+(X2∑+) + H(2S) dissociation limits. The various topographic features of the new global potential energy surface are discussed in detail, showing a good agreement with the previous results from the theory. The quasi-classical trajectory method is utilized to calculate the integral cross sections of the B+(3P) + H2(X1∑g+) (v = 0, j = 0) → BH+(X2∑+) + H(2S) reaction, which can provide another support for reliability of the title potential energy surface.
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Affiliation(s)
- Jiaxin Chen
- Department of Physics, Liaoning University, Shenyang 110036, P. R. China
| | - Chengyuan Zhang
- Department of Physics, Liaoning University, Shenyang 110036, P. R. China
| | - Yanling Lü
- Department of Physics, Liaoning University, Shenyang 110036, P. R. China
| | - Hainan Wang
- Department of Physics, Liaoning University, Shenyang 110036, P. R. China
| | - Yongqing Li
- Department of Physics, Liaoning University, Shenyang 110036, P. R. China.,Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, P. R. China
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4
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Ma H, Zhang C, Song Y, Ma F, Li Y. Accurate High-Level Ab Initio-Based Global Potential Energy Surface and Quantum Dynamics Calculation for the First Excited State of CH 2. J Phys Chem A 2021; 125:5490-5498. [PMID: 34137628 DOI: 10.1021/acs.jpca.1c02413] [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
A full three-dimensional global potential energy surface (PES), covering the whole configuration space, is reported first for the title system by fitting high-level ab initio energies at the multireference configuration interaction level with the aug-cc-pV6Z basis set. In this work, the many-body expansion method is invoked to fit the innate character of the CH2+(12A″) PES. The topographical features are examined in detail based on the new global PES and in accordance with the other calculations from the ab initio energies, which show the correct behavior at the C+(2P) + H2(X1Σg+) and CH+(a3Π) + H(2S) dissociation limits. Using a time-dependent wave packet method, we provide insights into the dynamics behavior for reaction of C+(2P) + H2(X1Σg+) → CH+(a3Π) + H(2S). The integral cross sections and reaction probabilities increase monotonically in terms of the collision energy.
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Affiliation(s)
- Hongyu Ma
- Department of Physics, Liaoning University, Shenyang 110036, China
| | - Chengyuan Zhang
- Department of Physics, Liaoning University, Shenyang 110036, China
| | - Yuzhi Song
- Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China
| | - Fengcai Ma
- Department of Physics, Liaoning University, Shenyang 110036, China
| | - Yongqing Li
- Department of Physics, Liaoning University, Shenyang 110036, China
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5
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Mota VC, Galvão BRL, Coura DVB, Varandas AJC. Accurate Potential Energy Surface for Quartet State HN 2 and Interplay of N( 4S) + NH( X̃3Σ -) versus H + N 2( A3Σ u+) Reactions. J Phys Chem A 2020; 124:781-789. [PMID: 31922752 DOI: 10.1021/acs.jpca.9b09467] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A global potential energy surface for the lowest quartet state of HN2 is reported for the first time from accurate multireference ab initio calculations extrapolated to the complete basis set limit using the double many-body expansion method. All its stationary points are characterized, with the lowest quartet of HN2 predicted to have a bent global minimum 36 kcal mol-1 below the N(4S) + NH(X̃3Σ-) asymptote, from which it is barrierlessly achievable. The entire set of calculated ab initio points has been fitted for energies up to 1000 kcal mol-1 above the global minimum with an RMSD of 0.89 kcal mol-1, a gap comprising all identified stationary points. Special care is taken in modeling the involved long-range forces and cusps caused by crossing seams. The novel PES prompts for the calculation of rate constants for several unexplored reactions that are relevant for combustion, plasma, and atmospheric chemistry.
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Affiliation(s)
- V C Mota
- Departamento de Fı́sica , Universidade Federal do Espı́rito Santo , 29075-910 Vitória , Brazil
| | - B R L Galvão
- Departamento de Quı́mica , Centro Federal de Educação Tecnológica de Minas Gerais, CEFET-MG , Av. Amazonas 5253 , 30421-169 Belo Horizonte , Minas Gerais , Brazil
| | - D V B Coura
- Departamento de Fı́sica , Universidade Federal do Espı́rito Santo , 29075-910 Vitória , Brazil
| | - A J C Varandas
- School of Physics and Physical Engineering , Qufu Normal University , 273165 Qufu , China.,Coimbra Chemistry Center and Chemistry Department , University of Coimbra , 3004-535 Coimbra , Portugal
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6
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Lü YL, Chai SJ, Ma HY, Gao SB, Li YQ. Globally accurate potential energy surface for PH2+ (11 A′) by using the switching function formalism. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1688875] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Y. L. Lü
- School of Physics, Liaoning University, Shenyang, People’s Republic of China
| | - S. J. Chai
- School of Physics, Liaoning University, Shenyang, People’s Republic of China
| | - H. Y. Ma
- School of Physics, Liaoning University, Shenyang, People’s Republic of China
| | - S. B. Gao
- School of Physics and Electronics, Shandong Normal University, Jinan, People’s Republic of China
| | - Y. Q. Li
- School of Physics, Liaoning University, Shenyang, People’s Republic of China
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7
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Ma HY, Guo Q, Li YQ. Accurate global potential energy surface by extrapolation to the complete basis set limit and dynamics studies for ground state of H 2S . SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 219:267-273. [PMID: 31048256 DOI: 10.1016/j.saa.2019.04.051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 04/19/2019] [Indexed: 06/09/2023]
Abstract
The atomic ions with hydrogen reactions play important role in biological chemistry, atmospheric and combustion chemistry. In this work, a full three-dimensional global many-body expansion potential energy surface (PES) for the ground state of H2S-(2A') is reported for the first time, since there is almost no investigations can accurately and completely describe the PES. It is obtained using many-body expansion theory and an extensive set of accurate ab initio energies extrapolated to the complete basis set limit, for improving the accuracy of the potential energy surface. The topographical features of the new three-dimensional global potential energy surface are examined in detail, and found to be in good agreement with theoretical and experimental results. To better test the reaction, such a surface was applied to quasi classical trajectory calculations for S-(2P)+H2(1Σg+)→SH-(1Σ)+H(2S) reaction. The integral cross sections, differential cross sections and the rate coefficients have been computed. Results indicate that such a work can be recommended for corresponding atmospheric dynamics studies and as building blocks for constructing the many body expansion potential energy surface of larger S-/H containing systems.
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Affiliation(s)
- H Y Ma
- Department of Physics, Liaoning University, Shenyang 110036, China
| | - Q Guo
- Department of Physics, Liaoning University, Shenyang 110036, China; Lvyuan Institute of Energy & Environmental Science and Technology, Liaoning University, Shenyang 110036, China
| | - Y Q Li
- Department of Physics, Liaoning University, Shenyang 110036, China.
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8
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Wang H, Bettens RPA. Modelling potential energy surfaces for small clusters using Shepard interpolation with Gaussian-form nodal functions. Phys Chem Chem Phys 2019; 21:4513-4522. [DOI: 10.1039/c8cp07640e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new interpolation method based on Gaussian functions to reliably generate potential energy surfaces.
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Affiliation(s)
- Haina Wang
- Department of Chemistry
- Princeton University
- Princeton
- USA
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9
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Mizus II, Polyansky OL, McKemmish LK, Tennyson J, Alijah A, Zobov NF. A global potential energy surface for H3+. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1554195] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Irina I. Mizus
- Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia
| | - Oleg L. Polyansky
- Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia
- Department of Physics and Astronomy, University College London, London, UK
| | - Laura K. McKemmish
- Department of Physics and Astronomy, University College London, London, UK
- Department of Chemistry, University of New South Wales, Sydney, Australia
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, London, UK
| | - Alexander Alijah
- Groupe de Spectrométrie Moléculaire et Atmosphérique, GSMA, UMR CNRS 7331, Université de Reims Champagne-Ardenne, Reims, France
| | - Nikolai F. Zobov
- Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia
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10
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11
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Guo L, Ma H, Zhang L, Song Y, Li Y. Accurate global potential energy surface for the ground state of CH 2 + by extrapolation to the complete basis set limit. RSC Adv 2018; 8:13635-13642. [PMID: 35539314 PMCID: PMC9079815 DOI: 10.1039/c8ra02228c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 03/25/2018] [Indexed: 11/21/2022] Open
Abstract
A full three-dimensional global potential energy surface is reported for the ground state of CH2 + by fitting accurate multireference configuration interaction energies calculated using aug-cc-pVQZ and aug-cc-pV5Z basis sets with extrapolation of the electron correlation energy to the complete basis set limit. The topographical characteristics have been compared in detail with a potential energy surface of the same type recently reported [J. Chem. Phys., 2015, 142, 124302] based on a least-squares fit to accurate high level ab initio MRCI(Q) energies, calculated using AV6Z basis set. The new three-dimensional global potential energy surface is then used in quasiclassical trajectory calculations for H(2S) + CH+(X 1Σ+) → C+(2P) + H2(X 1Σg +) reaction. The integral cross sections, differential cross sections and the rate coefficients have been computed. A comparison shows that our potential energy surface can be applied to any type of dynamic study.
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Affiliation(s)
- Lu Guo
- Department of Physics, Liaoning University Shenyang 110036 China
| | - Hongyu Ma
- Department of Physics, Liaoning University Shenyang 110036 China
| | - Lulu Zhang
- School of Physics and Electronics, Shandong Normal University Jinan 250014 China
| | - Yuzhi Song
- School of Physics and Electronics, Shandong Normal University Jinan 250014 China
| | - Yongqing Li
- Department of Physics, Liaoning University Shenyang 110036 China
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12
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Gonçalves CEM, Galvão BRL, Mota VC, Braga JP, Varandas AJC. Accurate Explicit-Correlation-MRCI-Based DMBE Potential-Energy Surface for Ground-State CNO. J Phys Chem A 2018; 122:4198-4207. [DOI: 10.1021/acs.jpca.8b01881] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- C. E. M. Gonçalves
- Departamento de Química, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Brazil
| | - B. R. L. Galvão
- Departamento de Química, Centro Federal de Educação Tecnológica de Minas Gerais, 30421-169, Belo Horizonte, Brazil
| | - V. C. Mota
- Departamento de Física, Universidade Federal do Espírito Santo, 29075-910, Vitória, Brazil
| | - J. P. Braga
- Departamento de Química, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Brazil
| | - A. J. C. Varandas
- School of Physics and Physical Engineering, Qufu Normal University, 273165 Qufu, China
- Department of Chemistry and Chemistry Centre,University of Coimbra, 3004-535, Coimbra, Portugal
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13
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Jayachander Rao B, Varandas A. Sub-femtosecond nuclear dynamics and high-harmonic generation: Can muonated species be used as a probe of isotope effects? Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.03.057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Rao BJ, Varandas AJC. Effect of Initial Vibrational-State Excitation on Subfemtosecond Photodynamics of Water. J Phys Chem A 2015; 119:12367-75. [PMID: 26496069 DOI: 10.1021/acs.jpca.5b07593] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We discuss the effect of initial vibrational-state excitation on the subfemtosecond photodynamics of water. Photoelectron spectra of Franck-Condon ionization to the (2)B1 state of the H2O(+) (D2O(+)) from the ground and several vibrationally excited states of the neutral are reported. Also calculated are ratios of the high-order harmonic generation (HHG) signals as a function of time for each initial vibrational state of the neutral molecule as predicted from the ratios of the square of the autocorrelation functions for D2O(+) and H2O(+). They reveal maxima as a function of time for each vibrational state of the neutral molecule. In turn, the HHG signals are found to be enhanced with vibrational excitation, with the calculated expectation values of the bond lengths and bond angle revealing quasiperiodic oscillations in time for all initial vibrational states of the neutral species. Although the bond lengths show only a marginal increase, the bond angle is found to be enhanced markedly by vibrational excitation, this being therefore responsible for the observed rise in the HHG signal.
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Affiliation(s)
- B Jayachander Rao
- Departamento de Química and Centro de Química, Universidade de Coimbra , 3004-535 Coimbra, Portugal
| | - A J C Varandas
- Departamento de Química and Centro de Química, Universidade de Coimbra , 3004-535 Coimbra, Portugal
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15
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Rocha CMR, Varandas AJC. Accurate ab initio-based double many-body expansion potential energy surface for the adiabatic ground-state of the C3 radical including combined Jahn-Teller plus pseudo-Jahn-Teller interactions. J Chem Phys 2015; 143:074302. [DOI: 10.1063/1.4928434] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- C. M. R. Rocha
- Departamento de Química, and Centro de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - A. J. C. Varandas
- Departamento de Química, and Centro de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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16
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Li YQ, Zhang PY, Han KL. Accurate high level ab initio-based global potential energy surface and dynamics calculations for ground state of CH2(+). J Chem Phys 2015; 142:124302. [PMID: 25833574 DOI: 10.1063/1.4916035] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A global many-body expansion potential energy surface is reported for the electronic ground state of CH2 (+) by fitting high level ab initio energies calculated at the multireference configuration interaction level with the aug-cc-pV6Z basis set. The topographical features of the new global potential energy surface are examined in detail and found to be in good agreement with those calculated directly from the raw ab initio energies, as well as previous calculations available in the literature. In turn, in order to validate the potential energy surface, a test theoretical study of the reaction CH(+)(X(1)Σ(+))+H((2)S)→C(+)((2)P)+H2(X(1)Σg (+)) has been carried out with the method of time dependent wavepacket on the title potential energy surface. The total integral cross sections and the rate coefficients have been calculated; the results determined that the new potential energy surface can both be recommended for dynamics studies of any type and as building blocks for constructing the potential energy surfaces of larger C(+)/H containing systems.
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Affiliation(s)
- Y Q Li
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - P Y Zhang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - K L Han
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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17
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Jayachander Rao B, Varandas AJC. Sub-femtosecond quantum dynamics of the strong-field ionization of water to the X ̃(2)B1 and Ã(2)A1 states of the cation. Phys Chem Chem Phys 2015; 17:6545-53. [PMID: 25660074 DOI: 10.1039/c4cp05549g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Motivated by recent efforts to achieve sub-femtosecond structural resolution in various molecular systems, we have performed a femtosecond quantum dynamics study of the water cation in the X ̃(2)B1 and Ã(2)A1 electronic states. Autocorrelation functions for H2O(+) and D2O(+) are calculated for such electronic states by solving numerically the time-dependent Schrödinger equation. From the ratio of the squared autocorrelation functions of D2O(+) and H2O(+), the high-order harmonic generation signals are calculated. Substantial vibrational dynamics is found in the Ã(2)A1 state as compared to the one in X ̃(2)B1, which supports recent experimental findings of Farrell et al., Phys. Rev. Lett., 2011, 107, 083001. Maxima in the above ratio are also predicted at ∼1.1 fs and ∼1.6 fs for the X ̃(2)B1 and Ã(2)A1 states, respectively. The expectation values of the positions of the atoms in H2O(+) as a function of time reveal a strong excitation of the bending mode in the Ã(2)A1 state, which explains the observed vibrational dynamics. The peaks in the ratios of the squared autocorrelation functions are also explained in terms of the evolving geometries of the water cation.
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Affiliation(s)
- B Jayachander Rao
- Departamento de Química and Centro de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal.
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18
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Li J, Varandas AJC. Accurate double many-body expansion potential energy surface for the 21A′ state of N2O. J Chem Phys 2014; 141:084307. [DOI: 10.1063/1.4893951] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jing Li
- Departamento de Química, Universidade de Coimbra 3004-535 Coimbra, Portugal
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19
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Mogo C, Brandão J. The READY program: Building a global potential energy surface and reactive dynamic simulations for the hydrogen combustion. J Comput Chem 2014; 35:1330-7. [PMID: 24760762 DOI: 10.1002/jcc.23621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 04/10/2014] [Accepted: 04/10/2014] [Indexed: 11/09/2022]
Abstract
READY (REActive DYnamics) is a program for studying reactive dynamic systems using a global potential energy surface (PES) built from previously existing PESs corresponding to each of the most important elementary reactions present in the system. We present an application to the combustion dynamics of a mixture of hydrogen and oxygen using accurate PESs for all the systems involving up to four oxygen and hydrogen atoms. Results at the temperature of 4000 K and pressure of 2 atm are presented and compared with model based on rate constants. Drawbacks and advantages of this approach are discussed and future directions of research are pointed out.
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Affiliation(s)
- César Mogo
- Centro de Investigação em Química do Algarve Universidade do Algarve, Portugal
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Teixeira OBM, Mota VC, Garcia de la Vega JM, Varandas AJC. Single-Sheeted Double Many-Body Expansion Potential Energy Surface for Ground-State ClO2. J Phys Chem A 2014; 118:4851-62. [DOI: 10.1021/jp503744x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- O. B. M. Teixeira
- Departamento
de Química Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - V. C. Mota
- Departamento
de Física, Universidade Federal do Espirito Santo, 29075-910 Vitória, Brazil
| | - J. M. Garcia de la Vega
- Departamento
de Química Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - A. J. C. Varandas
- Departamento
de Física, Universidade Federal do Espirito Santo, 29075-910 Vitória, Brazil
- Centro de Química,
and Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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21
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Li YQ, Ma FC, Sun MT. Accurate ab initio-based adiabatic global potential energy surface for the 2(2)A" state of NH2 by extrapolation to the complete basis set limit. J Chem Phys 2014; 139:154305. [PMID: 24160511 DOI: 10.1063/1.4824188] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A full three-dimensional global potential energy surface is reported first time for the title system, which is important for the photodissociation processes. It is obtained using double many-body expansion theory and an extensive set of accurate ab initio energies extrapolated to the complete basis set limit. Such a work can be recommended for dynamics studies of the N((2)D) + H2 reaction, a reliable theoretical treatment of the photodissociation dynamics and as building blocks for constructing the double many-body expansion potential energy surface of larger nitrogen/hydrogen containing systems. In turn, a preliminary theoretical study of the reaction N((2)D)+H2(X(1)Σg (+))(ν=0,j=0)→NH(a(1)Δ)+H((2)S) has been carried out with the method of quasi-classical trajectory on the new potential energy surface. Integral cross sections and thermal rate constants have been calculated, providing perhaps the most reliable estimate of the integral cross sections and the rate constants known thus far for such a reaction.
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Affiliation(s)
- Y Q Li
- Department of Physics, Liaoning University, Shenyang 110036, China
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22
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Cornaton Y, Krishna BM, Marquardt R. A new global and compact analytical representation of the potential energy surface of triatomic systems: application to copper nitrosyl and water. Mol Phys 2013. [DOI: 10.1080/00268976.2013.800605] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Yann Cornaton
- Laboratoire de Chimie Quantique, Université de Chimie, UMR 7177 CNRS/UdS Université de Strasbourg , 4, rue Blaise Pascal, CS90032, STRASBOURG CEDEX, 67081, France
| | - B. Murali Krishna
- Laboratoire de Chimie Quantique, Université de Chimie, UMR 7177 CNRS/UdS Université de Strasbourg , 4, rue Blaise Pascal, CS90032, STRASBOURG CEDEX, 67081, France
| | - Roberto Marquardt
- Laboratoire de Chimie Quantique, Université de Chimie, UMR 7177 CNRS/UdS Université de Strasbourg , 4, rue Blaise Pascal, CS90032, STRASBOURG CEDEX, 67081, France
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23
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Li Y, Yuan J, Chen M, Ma F, Sun M. Accurate double many-body expansion potential energy surface by extrapolation to the complete basis set limit and dynamics calculations for ground state of NH2. J Comput Chem 2013; 34:1686-96. [PMID: 23666848 DOI: 10.1002/jcc.23310] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 04/04/2013] [Accepted: 04/08/2013] [Indexed: 11/11/2022]
Abstract
An accurate single-sheeted double many-body expansion potential energy surface is reported for the title system. A switching function formalism has been used to warrant the correct behavior at the H2(X1Σg+)+N(2D) and NH (X3Σ-)+H(2S) dissociation channels involving nitrogen in the ground N(4S) and first excited N(2D) states. The topographical features of the novel global potential energy surface are examined in detail, and found to be in good agreement with those calculated directly from the raw ab initio energies, as well as previous calculations available in the literature. The novel surface can be using to treat well the Renner-Teller degeneracy of the 12A″ and 12A' states of NH 2. Such a work can both be recommended for dynamics studies of the N(2D)+H2 reaction and as building blocks for constructing the double many-body expansion potential energy surface of larger nitrogen/hydrogen-containing systems. In turn, a test theoretical study of the reaction N(2D)+H2(X1Σg+)(ν=0,j=0)→NH (X3Σ-)+H(2S) has been carried out with the method of quantum wave packet on the new potential energy surface. Reaction probabilities, integral cross sections, and differential cross sections have been calculated. Threshold exists because of the energy barrier (68.5 meV) along the minimum energy path. On the curve of reaction probability for total angular momentum J = 0, there are two sharp peaks just above threshold. The value of integral cross section increases quickly from zero to maximum with the increase of collision energy, and then stays stable with small oscillations. The differential cross section result shows that the reaction is a typical forward and backward scatter in agreement with experimental measurement result.
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Affiliation(s)
- Yongqing Li
- Department of Physics, Liaoning University, Shenyang, 110036, China
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24
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Varandas AJC. Combined-hyperbolic-inverse-power-representation of potential energy surfaces: A preliminary assessment for H3 and HO2. J Chem Phys 2013; 138:054120. [DOI: 10.1063/1.4788912] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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25
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Li J, Varandas AJC. Accurate ab-Initio-Based Single-Sheeted DMBE Potential-Energy Surface for Ground-State N2O. J Phys Chem A 2012; 116:4646-56. [DOI: 10.1021/jp302173h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jing Li
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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26
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Srivastava S, Sathyamurthy N, Varandas A. An accurate ab initio potential energy curve and the vibrational bound states of state of. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2011.08.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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27
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Mota VC, Caridade PJSB, Varandas AJC. Ab Initio-Based Global Double Many-Body Expansion Potential Energy Surface for the First 2A″ Electronic State of NO2. J Phys Chem A 2012; 116:3023-34. [DOI: 10.1021/jp300031q] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- V. C. Mota
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | | | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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29
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Song YZ, Varandas AJC. Accurate Double Many-Body Expansion Potential Energy Surface for Ground-State HS2 Based on ab Initio Data Extrapolated to the Complete Basis Set Limit. J Phys Chem A 2011; 115:5274-83. [DOI: 10.1021/jp201980m] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Y. Z. Song
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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30
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Galvão BRL, Corzo-Espinoza JA, Caridade PJSB, Varandas AJC. Quasiclassical trajectory study of the rotational distribution for the O+NO(v = 0) fundamental vibrational excitation. INT J CHEM KINET 2011. [DOI: 10.1002/kin.20560] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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31
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Hankel M, Smith SC, Varandas AJC. Anatomy of the S(1D) + H2 reaction: the dynamics on two new potential energy surfaces from quantum dynamics calculations. Phys Chem Chem Phys 2011; 13:13645-55. [DOI: 10.1039/c1cp20127a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Joseph S, Varandas AJC. Accurate MRCI and CC Study of the Most Relevant Stationary Points and Other Topographical Attributes for the Ground-State C2H2 Potential Energy Surface. J Phys Chem A 2010; 114:13277-87. [DOI: 10.1021/jp109830s] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S. Joseph
- Departamento de Química, Universidade de Coimbra 3004-535 Coimbra, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra 3004-535 Coimbra, Portugal
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33
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Li YQ, Varandas AJC. Ab-Initio-Based Global Double Many-Body Expansion Potential Energy Surface for the Electronic Ground State of the Ammonia Molecule. J Phys Chem A 2010; 114:6669-80. [DOI: 10.1021/jp1019685] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Y. Q. Li
- Departamento de Química, Universidade de Coimbra 3004-535 Coimbra, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra 3004-535 Coimbra, Portugal
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34
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Rio CM, Wang W, Brandão J. Quasiclassical trajectory calculations of the H+O2 and O+OH reactions on spectroscopically accurate modified DMBE IV PESs. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.theochem.2010.01.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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35
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Li YQ, Varandas AJC. Accurate Potential Energy Surface for the 12A′ State of NH2: Scaling of External Correlation Versus Extrapolation to the Complete Basis Set Limit. J Phys Chem A 2010; 114:9644-54. [DOI: 10.1021/jp100273r] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Y. Q. Li
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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36
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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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37
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Joseph S, Varandas AJC. Ab initio Based DMBE Potential Energy Surface for the Ground Electronic State of the C2H Molecule. J Phys Chem A 2010; 114:2655-64. [DOI: 10.1021/jp910269w] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S. Joseph
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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38
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BOGGIO-PASQUA M, VORONIN AI, HALVICK PH, RAYEZ JC, VARANDAS AJC. Coupled ab initio potential energy surfaces for the two lowest 2A′ electronic states of the C2H molecule. Mol Phys 2009. [DOI: 10.1080/00268970009483396] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- M. BOGGIO-PASQUA
- a Laboratoire de Physico-Chimie Moléculaire—UMR 5803/CNRS , Université Bordeaux 1 , 33405 , Talence Cedex, France
| | - A. I. VORONIN
- a Laboratoire de Physico-Chimie Moléculaire—UMR 5803/CNRS , Université Bordeaux 1 , 33405 , Talence Cedex, France
| | - PH. HALVICK
- a Laboratoire de Physico-Chimie Moléculaire—UMR 5803/CNRS , Université Bordeaux 1 , 33405 , Talence Cedex, France
| | - J.-C. RAYEZ
- a Laboratoire de Physico-Chimie Moléculaire—UMR 5803/CNRS , Université Bordeaux 1 , 33405 , Talence Cedex, France
| | - A. J. C. VARANDAS
- b Departamento de Química , Universidade de Coimbra , 3049 , Coimbra Codex , Portugal
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39
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Galvão BRL, Varandas AJC. Accurate Double Many-Body Expansion Potential Energy Surface for N3(4A′′) from Correlation Scaled ab Initio Energies with Extrapolation to the Complete Basis Set Limit. J Phys Chem A 2009; 113:14424-30. [DOI: 10.1021/jp903719h] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- B. R. L. Galvão
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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40
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Song YZ, Varandas AJC. Accurate ab initio double many-body expansion potential energy surface for ground-state H2S by extrapolation to the complete basis set limit. J Chem Phys 2009; 130:134317. [DOI: 10.1063/1.3103268] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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41
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Joseph S, Varandas AJC. Accurate Double Many-Body Expansion Potential Energy Surface for the Lowest Singlet State of Methylene. J Phys Chem A 2009; 113:4175-83. [DOI: 10.1021/jp810600r] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S. Joseph
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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42
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Galvão BRL, Rodrigues SPJ, Varandas AJC. Energy-switching potential energy surface for the water molecule revisited: A highly accurate singled-sheeted form. J Chem Phys 2008; 129:044302. [DOI: 10.1063/1.2953580] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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43
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A comparison of single-reference coupled-cluster and multi-reference configuration interaction methods for representative cuts of the potential energy surface. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.theochem.2008.02.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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44
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Lodi L, Polyansky O, Tennyson J. On the treatment of long-range interactions in global potential energy surfaces for chemically bound systems. Mol Phys 2008. [DOI: 10.1080/00268970802206442] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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45
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Mota VC, Varandas AJC. HN2(2A‘) Electronic Manifold. II. Ab Initio Based Double-Sheeted DMBE Potential Energy Surface via a Global Diabatization Angle. J Phys Chem A 2008; 112:3768-86. [DOI: 10.1021/jp710610d] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vinícius C. Mota
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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46
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Caridade PJSB, Mota VC, Mohallem JR, Varandas AJC. A Theoretical Study of Rate Coefficients for the O + NO Vibrational Relaxation. J Phys Chem A 2008; 112:960-5. [DOI: 10.1021/jp075419r] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- P. J. S. B. Caridade
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal, and Departamento de Física, ICEx, Universidade Federal de Minas Gerais, P.O. Box 702, 30123-970 Belo Horizonte, MG, Brasil
| | - V. C. Mota
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal, and Departamento de Física, ICEx, Universidade Federal de Minas Gerais, P.O. Box 702, 30123-970 Belo Horizonte, MG, Brasil
| | - J. R. Mohallem
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal, and Departamento de Física, ICEx, Universidade Federal de Minas Gerais, P.O. Box 702, 30123-970 Belo Horizonte, MG, Brasil
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal, and Departamento de Física, ICEx, Universidade Federal de Minas Gerais, P.O. Box 702, 30123-970 Belo Horizonte, MG, Brasil
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47
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An Important Well Studied Atmospheric Reaction, <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:mi mathvariant="normal">O</mml:mi><mml:mspace width="0.25em"/><mml:mo stretchy="false">(</mml:mo><mml:mmultiscripts><mml:mi>D</mml:mi><mml:mprescripts/><mml:none/><mml:mn>1</mml:mn></mml:mmultiscripts><mml:mo stretchy="false">)</mml:mo><mml:mo>+</mml:mo><mml:msub><mml:mi mathvariant="normal">H</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>. ADVANCES IN QUANTUM CHEMISTRY 2008. [DOI: 10.1016/s0065-3276(07)00203-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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48
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Piecuch P, Włoch M, Varandas AJC. Application of renormalized coupled-cluster methods to potential function of water. Theor Chem Acc 2007. [DOI: 10.1007/s00214-007-0297-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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49
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Viegas LP, Alijah A, Varandas AJC. Accurate ab initio based multisheeted double many-body expansion potential energy surface for the three lowest electronic singlet states of H3+. J Chem Phys 2007; 126:074309. [PMID: 17328607 DOI: 10.1063/1.2566770] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The authors present diabatic and adiabatic potential energy surfaces for the three lowest electronic singlet states of H3+. The modeling of the surfaces is based on the multi-sheeted double many-body expansion method which consists of dressing the various matrix elements of the diatomics-in-molecules potential matrix with three-body terms. The avoided crossing between the two lowest states and the conical intersection between the second and the third state are accurately represented by construction.
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Affiliation(s)
- Luís P Viegas
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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50
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