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Liu Z, Li X, Ge M, Zheng R, Duan C. Structural characterization of the NO(X 2Π)-N 2O complex with mid-infrared laser absorption spectroscopy and quantum chemical calculations. J Chem Phys 2020; 152:154303. [PMID: 32321260 DOI: 10.1063/1.5144648] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Both positive and negative ions of N3O2 have been observed in various experiments. The neutral N3O2 was predicted to exist either as a weakly bound NO·N2O complex or a covalent molecule. The rovibrational spectrum of the NO(X2Π)-N2O complex has been measured for the first time in the 5.3 µm region using distributed quantum cascade lasers to probe the direct absorption in a slit-jet supersonic expansion. The observed spectrum is analyzed with a semi-rigid asymmetric rotor Hamiltonian for a planar open-shell complex, giving a bent geometry with an a-axis-NO angle of about 21.9°. The vibrationally averaged 2A'-2A″ energy separation is determined to be ε = 144.56(95) cm-1 for the ground state, indicating that the electronic orbital angular momentum is partially quenched upon complexation. Geometry optimizations of the complex restricted to a planar configuration at the RCCSD(T)/aug-cc-pVTZ level of theory show that the 2A″ state is more stable than the 2A' state by about 110 cm-1 and the N atom of NO points to the central N atom of N2O at the minimum of the 2A″ state.
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Affiliation(s)
- Zhuang Liu
- College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
| | - Xiang Li
- College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
| | - Murong Ge
- College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
| | - Rui Zheng
- School of Physics and Electronics, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
| | - Chuanxi Duan
- College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
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Zhu Y, Ping L, Bai M, Liu Y, Song H, Li J, Yang M. Tracking the energy flow in the hydrogen exchange reaction OH + H 2O → H 2O + OH. Phys Chem Chem Phys 2018; 20:12543-12556. [PMID: 29693667 DOI: 10.1039/c8cp00938d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The prototypical hydrogen exchange reaction OH + H2O → H2O + OH has attracted considerable interest due to its importance in a wide range of chemically active environments. In this work, an accurate global potential energy surface (PES) for the ground electronic state was developed based on ∼44 000 ab initio points at the level of UCCSD(T)-F12a/aug-cc-pVTZ. The PES was fitted using the fundamental invariant-neural network method with a root mean squared error of 4.37 meV. The mode specific dynamics was then studied by the quasi-classical trajectory method on the PES. Furthermore, the normal mode analysis approach was employed to calculate the final vibrational state distribution of the product H2O, in which a new scheme to acquire the Cartesian coordinates and momenta of each atom in the product molecule from the trajectories was proposed. It was found that, on one hand, excitation of either the symmetric stretching mode or the asymmetric stretching mode of the reactant H2O promotes the reaction more than the translational energy, which can be rationalized by the sudden vector projection model. On the other hand, the relatively higher efficacy of exciting the symmetric stretching mode than that of the asymmetric stretching mode is caused by the prevalence of the indirect mechanism at low collision energies and the stripping mechanism at high collision energies. In addition, the initial collision energy turns ineffectively into the vibrational energy of the products H2O and OH while a fraction of the energy transforms into the rotational energy of the product H2O. Fundamental excitation of the stretching modes of H2O results in the product H2O having the highest population in the fundamental state of the asymmetric stretching mode, followed by the ground state and the fundamental state of the symmetric stretching mode.
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Affiliation(s)
- Yongfa Zhu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.
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Bai M, Lu D, Li J. Quasi-classical trajectory studies on the full-dimensional accurate potential energy surface for the OH + H2O = H2O + OH reaction. Phys Chem Chem Phys 2017; 19:17718-17725. [DOI: 10.1039/c7cp02656k] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first accurate PES for the OH + H2O reaction is developed by using the permutation invariant polynomial-neural network method to fit ∼48 000 CCSD(T)-F12a/AVTZ calculated points.
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Affiliation(s)
- Mengna Bai
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 401331
- China
| | - Dandan Lu
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 401331
- China
| | - Jun Li
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 401331
- China
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Hernandez FJ, Brice JT, Leavitt CM, Liang T, Raston PL, Pino GA, Douberly GE. Mid-infrared signatures of hydroxyl containing water clusters: Infrared laser Stark spectroscopy of OH–H2O and OH(D2O)n (n = 1-3). J Chem Phys 2015; 143:164304. [DOI: 10.1063/1.4933432] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Federico J. Hernandez
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
- INFIQC, Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Centro Láser de Ciencias Moleculares, Universidad Nacional de Córdoba, Ciudad Universitaria, Pabellón, X5000HUA Córdoba, Argentina
| | - Joseph T. Brice
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | | | - Tao Liang
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Paul L. Raston
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, Virginia 22807, USA
| | - Gustavo A. Pino
- INFIQC, Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Centro Láser de Ciencias Moleculares, Universidad Nacional de Córdoba, Ciudad Universitaria, Pabellón, X5000HUA Córdoba, Argentina
| | - Gary E. Douberly
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
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Galbis E, Giglio E, Gervais B. A diabatic parameterization of the twofold ground state potential energy surface of the H2O-OH molecular complex. J Chem Phys 2013; 139:164313. [DOI: 10.1063/1.4826319] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Buszek RJ, Barker JR, Francisco JS. Water Effect on the OH + HCl Reaction. J Phys Chem A 2012; 116:4712-9. [DOI: 10.1021/jp3025107] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Robert J. Buszek
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084,
United States
| | - John R. Barker
- Department
of Atmospheric, Oceanic
and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109-2143, United States
| | - Joseph S. Francisco
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084,
United States
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Buszek RJ, Torrent-Sucarrat M, Anglada JM, Francisco JS. Effects of a single water molecule on the OH + H2O2 reaction. J Phys Chem A 2012; 116:5821-9. [PMID: 22455374 DOI: 10.1021/jp2077825] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The effect of a single water molecule on the reaction between H(2)O(2) and HO has been investigated by employing MP2 and CCSD(T) theoretical approaches in connection with the aug-cc-PVDZ, aug-cc-PVTZ, and aug-cc-PVQZ basis sets and extrapolation to an ∞ basis set. The reaction without water has two elementary reaction paths that differ from each other in the orientation of the hydrogen atom of the hydroxyl radical moiety. Our computed rate constant, at 298 K, is 1.56 × 10(-12) cm(3) molecule(-1) s(-1), in excellent agreement with the suggested value by the NASA/JPL evaluation. The influence of water vapor has been investigated by considering either that H(2)O(2) first forms a complex with water that reacts with hydroxyl radical or that H(2)O(2) reacts with a previously formed H(2)O·OH complex. With the addition of water, the reaction mechanism becomes much more complex, yielding four different reaction paths. Two pathways do not undergo the oxidation reaction but an exchange reaction where there is an interchange between H(2)O(2)·H(2)O and H(2)O·OH complexes. The other two pathways oxidize H(2)O(2), with a computed total rate constant of 4.09 × 10(-12) cm(3) molecule(-1) s(-1) at 298 K, 2.6 times the value of the rate constant of the unassisted reaction. However, the true effect of water vapor requires taking into account the concentration of the prereactive bimolecular complex, namely, H(2)O(2)·H(2)O. With this consideration, water can actually slow down the oxidation of H(2)O(2) by OH between 1840 and 20.5 times in the 240-425 K temperature range. This is an example that demonstrates how water could be a catalyst in an atmospheric reaction in the laboratory but is slow under atmospheric conditions.
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Affiliation(s)
- Robert J Buszek
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
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Affiliation(s)
- Daniel M. Chipman
- Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556-5674, United States
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Soloveichik P, O’Donnell BA, Lester MI, Francisco JS, McCoy AB. Infrared Spectrum and Stability of the H2O−HO Complex: Experiment and Theory. J Phys Chem A 2009; 114:1529-38. [DOI: 10.1021/jp907885d] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pesia Soloveichik
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Bridget A. O’Donnell
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Marsha I. Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Joseph S. Francisco
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084
| | - Anne B. McCoy
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210
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Du S, Francisco JS. Spectroscopic properties and stability of the SH⋅H2O open shell complex. J Chem Phys 2009; 130:124304. [DOI: 10.1063/1.3089869] [Citation(s) in RCA: 10] [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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