1
|
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.
Collapse
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
| |
Collapse
|
2
|
Temperature dependence of the rate coefficient of formation of CN radical from C + NH. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
3
|
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.
Collapse
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
| |
Collapse
|
4
|
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
| |
Collapse
|
5
|
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
| |
Collapse
|
6
|
Teixeira OBM, Caridade PJSB, Mota VC, Garcia de la Vega JM, Varandas AJC. Dynamics of the O + ClO reaction: reactive and vibrational relaxation processes. J Phys Chem A 2014; 118:12120-9. [PMID: 25429771 DOI: 10.1021/jp511498r] [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
Classical trajectories have been integrated to study the O + ClO reaction, both reactive and vibrational energy transfer processes, for the range of temperatures 100 ≤ T/K ≤ 500 using momentum Gaussian binning. The employed potential energy surface is the recently proposed single-sheeted double many-body expansion potential energy surface for the (2)A" ground-state of ClO2 based on multireference ab initio data. A capture-type regime with a room-temperature rate constant of (17.8 ± 0.5) × 10(-12) cm(3) s(-1) and temperature dependence of k(T/K)/cm(3) s(-1) = 22.4 × 10(-12) × T(-0.81) exp(-39.2/T) has been found. Although the value reported here is half of the experimental and recommended one, tentative explanations are given. Other dynamical attributes are also examined for the title reaction, with state-to-all and state-to-state vibrational relaxation and excitation rate constants reported for temperatures of relevance in stratospheric chemistry.
Collapse
Affiliation(s)
- O B M Teixeira
- Departamento de Química Física Aplicada, Universidad Autónoma de Madrid , 28049 Madrid, Spain
| | | | | | | | | |
Collapse
|
7
|
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
| | | |
Collapse
|
8
|
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
| |
Collapse
|
9
|
Lu R, Wang Y, Deng K. Quantum wave packet and quasiclassical trajectory studies of the reaction H(2S) + CH(X2 Π; v = 0, j = 1) → C(1D) + H2 (X1 Σg+): Coriolis coupling effects and stereodynamics. J Comput Chem 2013; 34:1735-42. [PMID: 23670833 DOI: 10.1002/jcc.23309] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2012] [Revised: 04/01/2013] [Accepted: 04/09/2013] [Indexed: 12/14/2022]
Abstract
The quantum mechanics (QM) and quasiclassical trajectory (QCT) calculations have been carried out for the title reaction with the ground minimal allowed rotational state of CH (j = 1) on the 1 (1)A' potential energy surface. For the reaction probability at total angular momentum J = 0, a similar trend of the QM and QCT calculations is observed, and the QM results are larger than the latter almost in the whole considered energy range (0.1-1.5 eV). The QCT integral cross sections are larger than the QM results with centrifugal sudden approximation, while smaller than those from QM method including Coriolis coupling for collision energies bigger than 0.25 eV. The quantum wave-packet computations show that the Coriolis coupling effects get more and more pronounced with increasing of J. In addition to the scalar properties, the stereodynamical properties, such as the average rotational alignment factor <P2 (j'•k)>, the angular distributions P(θr ), P(ϕr ), P(θr ,ϕr ), and the polarization-dependent generalized differential cross sections have been explored in detail by QCT approach.
Collapse
Affiliation(s)
- Ruifeng Lu
- Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China
| | | | | |
Collapse
|
10
|
LI LIN, DONG SHUNLE. QUASICLASSICAL TRAJECTORY STUDY OF PRODUCT POLARIZATIONS IN THE H(2S) + NH → N(4S) + H2 REACTION. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2012. [DOI: 10.1142/s0219633612500873] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Based on the DMBE potential surface of the 4 A ″ ground-state, the product rotational polarizations in the title reaction are studied by using quasiclassical trajectory (QCT) calculation method. Three angular distributions of P(θr), P(Φr), P(θr, Φr) and the four polarization-dependent differential cross sections (PDDCSs) were calculated for the collision energy range of 1–20 kcal/mol. The results revealed that the product is backward-scattering and the product rotational angular momentum j′ is aligned and oriented. With the increment of collision energy, the degree of the product alignment and orientation is enhanced, showing the collision energy-dependent behaviors of the product polarizations.
Collapse
Affiliation(s)
- LIN LI
- College of Information Science and Engineering, Ocean University of China, Qingdao 266071, P. R. China
- College of Information Engineering, Qingdao University, Qingdao 266071, P. R. China
| | - SHUNLE DONG
- College of Information Science and Engineering, Ocean University of China, Qingdao 266071, P. R. China
| |
Collapse
|
11
|
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
| | | |
Collapse
|
12
|
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
| |
Collapse
|
13
|
Joseph S, Caridade PJSB, Varandas AJC. Quasiclassical Trajectory Study of the C(1D) + H2 Reaction and Isotopomeric Variants: Kinetic Isotope Effect and CD/CH Branching Ratio. J Phys Chem A 2011; 115:7882-90. [DOI: 10.1021/jp2032912] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [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
| |
Collapse
|
14
|
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
| |
Collapse
|
15
|
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
| |
Collapse
|
16
|
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
| |
Collapse
|
17
|
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
| |
Collapse
|
18
|
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
|
19
|
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
| |
Collapse
|
20
|
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
| | | |
Collapse
|
21
|
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]
|
22
|
Piecuch P, Wloch M, Varandas AJC. Renormalized coupled-cluster methods: Theoretical foundations and application to the potential function of water. ACTA ACUST UNITED AC 2007. [DOI: 10.1007/978-1-4020-5460-0_3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
|
23
|
Accurate DMBE Potential Energy Surface For the N(2D) + H2(1Σ g + ) Reaction Using an Improved Switching Function Formalism. Theor Chem Acc 2006. [DOI: 10.1007/s00214-006-0092-6] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
24
|
Varandas AJC, Rodrigues SPJ. New Double Many-Body Expansion Potential Energy Surface for Ground-State HCN from a Multiproperty Fit to Accurate ab Initio Energies and Rovibrational Calculations. J Phys Chem A 2005; 110:485-93. [PMID: 16405320 DOI: 10.1021/jp051434p] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An accurate single-sheeted double many-body expansion potential energy surface has been obtained for the ground electronic state of the hydrogen cyanide molecule via a multiproperty fit to ab initio energies and rovibrational data. This includes 106 rovibrational levels and 2313 discrete points, which are fit with a rmsd of 4 cm(-1) and 2.42 kcal mol(-1), respectively, and seven zero first-derivatives that are reproduced at three stationary points. Since the potential also describes accurately the appropriate asymptotic limits at the various dissociation channels, it is commended both for the simulation of rovibrational spectra and reaction dynamics.
Collapse
Affiliation(s)
- A J C Varandas
- Departamento de Química, Universidade de Coimbra 3004-535 Coimbra, Portugal
| | | |
Collapse
|
25
|
Poveda LA, Varandas AJC. Repulsive double many-body expansion potential energy surface for the reactions N(4S)+ H2⇌ NH(X3Σ–)+ H from accurate ab initio calculations. Phys Chem Chem Phys 2005; 7:2867-73. [PMID: 16189605 DOI: 10.1039/b505590c] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A single-sheeted DMBE potential energy surface is reported for the reactions N(4S)+H2<-->NH(X3Sigma-)+H based on a fit to accurate multireference configuration interaction energies. These have been calculated using the aug-cc-pVQZ basis set of Dunning and the full valence complete active space wave function as reference, being semi-empirically corrected by scaling the two-body and three-body dynamical correlation energies. The topographical features of the novel global potential energy surface are examined in detail, including a conical intersection involving the two first 4A'' potential energy surfaces which has been transformed into an avoided crossing in the present single-sheeted representation.
Collapse
Affiliation(s)
- L A Poveda
- Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal
| | | |
Collapse
|
26
|
Poveda LA, Varandas AJC. Accurate Single-Valued Double Many-Body Expansion Potential Energy Surface for Ground-State HN2. J Phys Chem A 2003. [DOI: 10.1021/jp030571o] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- L. A. Poveda
- Departamento de Quımica, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - A. J. C. Varandas
- Departamento de Quımica, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| |
Collapse
|
27
|
Ansari WUH, Varandas AJC. Six-Dimensional Energy-Switching Potential Energy Surface for HeHCN. J Phys Chem A 2002. [DOI: 10.1021/jp021209x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Wazir-ul H. Ansari
- Departamento de Química, Universidade de Coimbra 3004-535 Coimbra, Portugal
| | | |
Collapse
|
28
|
Marques JMC, Voronin AI, Varandas AJC. Li + Li2 Dissociation Reaction Using the Self-Consistent Potential and Trajectory Surface Hopping Methods. J Phys Chem A 2002. [DOI: 10.1021/jp0144395] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- J. M. C. Marques
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra Codex, Portugal
| | - A. I. Voronin
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra Codex, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra Codex, Portugal
| |
Collapse
|
29
|
Martínez-Núñez E, Varandas AJC. Single-Valued DMBE Potential Energy Surface for HSO: A Distributed n-Body Polynomial Approach. J Phys Chem A 2001. [DOI: 10.1021/jp0101460] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- E. Martínez-Núñez
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra, Portugal
| |
Collapse
|
30
|
Test studies on the potential energy surface and rate constant for the OH+O3 atmospheric reaction. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)01222-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
31
|
Riganelli A, Wang W, Varandas AJC. Monte Carlo Simulation Approach to Internal Partition Functions for van der Waals Molecules. J Phys Chem A 1999. [DOI: 10.1021/jp991494t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. Riganelli
- Departamento de Química, Universidade de Coimbra P-3049 Coimbra Codex, Portugal
| | - W. Wang
- Departamento de Química, Universidade de Coimbra P-3049 Coimbra Codex, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra P-3049 Coimbra Codex, Portugal
| |
Collapse
|
32
|
Voronin AI, Marques JMC, Varandas AJC. Trajectory Surface Hopping Study of the Li + Li2(XΣg+) Dissociation Reaction. J Phys Chem A 1998. [DOI: 10.1021/jp9805860] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- A. I. Voronin
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra Codex, Portugal
| | - J. M. C. Marques
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra Codex, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra Codex, Portugal
| |
Collapse
|
33
|
Varandas AJC, Voronin AI, Jimeno P. Conical intersections between the two lowest 1A′ potential energy surfaces of HCN, and the role of three-body effects. J Chem Phys 1997. [DOI: 10.1063/1.474159] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
34
|
Varandas AJC. Energy switching approach to potential surfaces. II. Two-valued function for the water molecule. J Chem Phys 1997. [DOI: 10.1063/1.474385] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
35
|
Varandas AJC, Rodrigues SPJ. Double many-body expansion potential energy surface for ground-state HCN based on realistic long range forces and accurateab initiocalculations. J Chem Phys 1997. [DOI: 10.1063/1.473864] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
36
|
Varandas AJC. Energy switching approach to potential surfaces: An accurate single‐valued function for the water molecule. J Chem Phys 1996. [DOI: 10.1063/1.473005] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
|
37
|
Pais AACC, Voronin AI, Varandas AJC. Dynamics of the Li + Li2 Reaction: Coexistence of Statistical and Direct Attributes. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9530818] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- A. A. C. C. Pais
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra Codex, Portugal
| | - A. I. Voronin
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra Codex, Portugal
| | - A. J. C. Varandas
- Departamento de Química, Universidade de Coimbra, P-3049 Coimbra Codex, Portugal
| |
Collapse
|
38
|
Varandas A, Rodrigues S. Internuclear dependence of static dipole polarizability in diatomic molecules. Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(95)00936-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
39
|
Varandas A. J = 0 reactivity and cross-section in the H + O2 reaction: is there a pronounced maximum as a function of energy? Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(95)00093-j] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
40
|
Adjusted double many-body expansion potential energy surface for H02 based on rigorous vibrational calculations. Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(94)01470-g] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
41
|
Analytical potential energy surfaces for alkali dihalide molecules based on the diatomics-in-molecules formalism. Application to LiF2. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(94)00771-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
42
|
Bruckmeier R, Wunderlich C, Figger H. New experimental insight into the ground state potential surface of triatomic hydrogen. PHYSICAL REVIEW LETTERS 1994; 72:2550-2553. [PMID: 10055912 DOI: 10.1103/physrevlett.72.2550] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
43
|
|