1
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Laskar BI, Shukla PK. Adsorption of HOOO. radical on pristine and doped graphene—a first-principles study. Struct Chem 2021. [DOI: 10.1007/s11224-020-01702-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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2
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Bartlett MA, Kazez AH, Schaefer HF, Allen WD. Riddles of the structure and vibrational dynamics of HO 3 resolved near the ab initio limit. J Chem Phys 2019; 151:094304. [PMID: 31492062 DOI: 10.1063/1.5110291] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The hydridotrioxygen (HO3) radical has been investigated in many previous theoretical and experimental studies over several decades, originally because of its possible relevance to the tropospheric HOx cycle but more recently because of its fascinating chemical bonding, geometric structure, and vibrational dynamics. We have executed new, comprehensive research on this vexing molecule via focal point analyses (FPA) to approach the ab initio limit of optimized geometric structures, relative energies, complete quartic force fields, and the entire reaction path for cis-trans isomerization. High-order coupled cluster theory was applied through the CCSDT(Q) and even CCSDTQ(P) levels, and CBS extrapolations were performed using cc-pVXZ (X = 2-6) basis sets. The cis isomer proves to be higher than trans by 0.52 kcal mol-1, but this energetic ordering is achieved only after the CCSDT(Q) milestone is reached; the barrier for cis → trans isomerization is a minute 0.27 kcal mol-1. The FPA central re(O-O) bond length of trans-HO3 is astonishingly long (1.670 Å), consistent with the semiexperimental re distance we extracted from microwave rotational constants of 10 isotopologues using FPA vibration-rotation interaction constants (αi). The D0(HO-O2) dissociation energy converges to a mere 2.80 ± 0.25 kcal mol-1. Contrary to expectation for such a weakly bound system, vibrational perturbation theory performs remarkably well with the FPA anharmonic force fields, even for the torsional fundamental near 130 cm-1. Exact numerical procedures are applied to the potential energy function for the torsional reaction path to obtain energy levels, tunneling rates, and radiative lifetimes. The cis → trans isomerization occurs via tunneling with an inherent half-life of 1.4 × 10-11 s and 8.6 × 10-10 s for HO3 and DO3, respectively, thus resolving the mystery of why the cis species has not been observed in previous experiments executed in dissipative environments that allow collisional cooling of the trans-HO3 product. In contrast, the pure ground eigenstate of the cis species in a vacuum is predicted to have a spontaneous radiative lifetime of about 1 h and 5 days for HO3 and DO3, respectively.
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Affiliation(s)
- Marcus A Bartlett
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Arianna H Kazez
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Wesley D Allen
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
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3
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Hu X, Zuo J, Xie C, Dawes R, Guo H, Xie D. Anab initiobased full-dimensional potential energy surface for OH + O2⇄ HO3and low-lying vibrational levels of HO3. Phys Chem Chem Phys 2019; 21:13766-13775. [DOI: 10.1039/c9cp02206f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A full-dimensional potential energy surface for HO3, including the HO + O2dissociation asymptote, is developed and rigorous quantum dynamics calculations based on this PES have been carried out to compute the vibrational energy levels of HO3.
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Affiliation(s)
- Xixi Hu
- Institute of Theoretical and Computational Chemistry
- Key Laboratory of Mesoscopic Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - Junxiang Zuo
- Institute of Theoretical and Computational Chemistry
- Key Laboratory of Mesoscopic Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - Changjian Xie
- Department of Chemistry and Chemical Biology
- University of New Mexico
- Albuquerque
- USA
| | - Richard Dawes
- Department of Chemistry
- Missouri University of Science and Technology
- Rolla
- USA
| | - Hua Guo
- Department of Chemistry and Chemical Biology
- University of New Mexico
- Albuquerque
- USA
| | - Daiqian Xie
- Institute of Theoretical and Computational Chemistry
- Key Laboratory of Mesoscopic Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
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4
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Zuo JX, Hu XX, Xie DQ. Quantum Dynamics of Oxyhydrogen Complex-Forming Reactions for the HO2 and HO3 Systems. CHINESE J CHEM PHYS 2018. [DOI: 10.1063/1674-0068/31/cjcp1804060] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Jun-xiang Zuo
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Xi-xi Hu
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Dai-qian Xie
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
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5
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A theoretical characterization of reactions of HOOO radical with guanine: formation of 8-oxoguanine. Struct Chem 2018. [DOI: 10.1007/s11224-018-1095-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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6
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Levanov AV, Isaikina OY, Lunin VV. Enthalpies of the formation and decomposition of hydrogen trioxide HOOOH in an aqueous solution. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2016. [DOI: 10.1134/s0036024416110145] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Burgess DR. An Evaluation of Gas Phase Enthalpies of Formation for Hydrogen-Oxygen (H xO y) Species. JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY 2016; 121:108-138. [PMID: 34434616 PMCID: PMC7339710 DOI: 10.6028/jres.121.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/11/2016] [Indexed: 06/13/2023]
Abstract
We have compiled gas phase enthalpies of formation for nine hydrogen-oxygen species (HxOy) and selected recommended values for H, O, OH, H2O, HO2, H2O2, O3, HO3, and H2O3. The compilation consists of values derived from experimental measurements, quantum chemical calculations, and prior evaluations. This work updates the recommended values in the NIST-JANAF (1985) and Gurvich et al. (1989) thermochemical tables for seven species. For two species, HO3 and H2O3 (important in atmospheric chemistry) and not found in prior thermochemical evaluations, we also provide supplementary data consisting of molecular geometries, vibrational frequencies, and torsional potentials which can be used to compute thermochemical functions. For all species, we also provide supplementary data consisting of zero point energies, vibrational frequencies, and ion reaction energetics.
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Affiliation(s)
- Donald R Burgess
- National Institute of Standards and Technology, Gaithersburg, MD 20899
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8
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Zou L, Hays BM, Weaver SLW. Weakly Bound Clusters in Astrochemistry? Millimeter and Submillimeter Spectroscopy of trans-HO3 and Comparison to Astronomical Observations. J Phys Chem A 2015; 120:657-67. [PMID: 26709536 DOI: 10.1021/acs.jpca.5b09624] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The emergence of chemical complexity during star and planet formation is largely guided by the chemistry of unstable molecules that are reaction intermediates in terrestrial chemistry. Our knowledge of these intermediates is limited by both the lack of laboratory studies and the difficulty in their astronomical detection. In this work, we focus on the weakly bound cluster HO3 as an example of the connection between laboratory spectroscopic study and astronomical observations. Here, we present a fast-sweep spectroscopic technique in the millimeter and submillimeter range to facilitate the laboratory search for trans-HO3 and DO3 transitions in a discharge supersonic jet and report their rotational spectra from 70 to 450 GHz. These new measurements enable full determination of the molecular constants of HO3 and DO3. We also present a preliminary search for trans-HO3 in 32 star-forming regions using this new spectroscopic information. HO3 is not detected, and column density upper limits are reported. This work provides additional benchmark information for computational studies of this intriguing radical, as well as a reliable set of molecular constants for extrapolation of the transition frequencies of HO3 for future astronomical observations.
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Affiliation(s)
- Luyao Zou
- Department of Chemistry, Emory University , Atlanta, Georgia, United States
| | - Brian M Hays
- Department of Chemistry, Emory University , Atlanta, Georgia, United States
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9
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Hydrogen polyoxides H2O3 and H2O4 as components of peroxy radical condensate obtained from electro-dissociated water vapor. Chem Phys 2015. [DOI: 10.1016/j.chemphys.2014.11.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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10
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Direct dynamics study on the reaction of 1,1-difluoroethane with hydrogen trioxide radical. COMPUT THEOR CHEM 2014. [DOI: 10.1016/j.comptc.2014.02.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Varandas AJC. Is HO3− multiple-minimum and floppy? Covalent to van der Waals isomerization and bond rupture of a peculiar anion. Phys Chem Chem Phys 2014; 16:16997-7007. [DOI: 10.1039/c4cp01757a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The HO3− anion is multiple-minimum and floppy: the two main isomers and isomerization barrier all lie quite below dissociation.
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Affiliation(s)
- A. J. C. Varandas
- Departamento de Química
- and Centro de Química
- Universidade de Coimbra
- 3004-535 Coimbra, Portugal
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12
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Hoy EP, Schwerdtfeger CA, Mazziotti DA. Relative Energies and Geometries of the cis- and trans-HO3 Radicals from the Parametric 2-Electron Density Matrix Method. J Phys Chem A 2013; 117:1817-25. [DOI: 10.1021/jp3105562] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Erik P. Hoy
- Department of Chemistry and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637,
United States
| | - Christine A. Schwerdtfeger
- Department of Chemistry and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637,
United States
| | - David A. Mazziotti
- Department of Chemistry and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637,
United States
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13
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McCarthy MC, Lattanzi V, Kokkin D, Martinez O, Stanton JF. On the molecular structure of HOOO. J Chem Phys 2012; 136:034303. [DOI: 10.1063/1.3673875] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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14
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Beames JM, Lester MI, Murray C, Varner ME, Stanton JF. Analysis of the HOOO torsional potential. J Chem Phys 2011; 134:044304. [DOI: 10.1063/1.3518415] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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Varandas AJC. Is HO3 minimum cis or trans? An analytic full-dimensional ab initio isomerization path. Phys Chem Chem Phys 2011; 13:9796-811. [DOI: 10.1039/c1cp20221a] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Anglada JM, Olivella S, Solé A. On the Dissociation of Ground State trans-HOOO Radical: A Theoretical Study. J Chem Theory Comput 2010; 6:2743-50. [DOI: 10.1021/ct100358e] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Josep M. Anglada
- Institut de Química Avançada de Catalunya, CSIC, Jordi Girona 18-26, 08034-Barcelona, Catalonia, Spain, and Departament de Química Física and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Martí i Franquès 1, 08028-Barcelona, Catalonia, Spain
| | - Santiago Olivella
- Institut de Química Avançada de Catalunya, CSIC, Jordi Girona 18-26, 08034-Barcelona, Catalonia, Spain, and Departament de Química Física and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Martí i Franquès 1, 08028-Barcelona, Catalonia, Spain
| | - Albert Solé
- Institut de Química Avançada de Catalunya, CSIC, Jordi Girona 18-26, 08034-Barcelona, Catalonia, Spain, and Departament de Química Física and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Martí i Franquès 1, 08028-Barcelona, Catalonia, Spain
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17
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Le Picard SD, Tizniti M, Canosa A, Sims IR, Smith IWM. The Thermodynamics of the Elusive HO3 Radical. Science 2010; 328:1258-62. [DOI: 10.1126/science.1184459] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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18
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Semes’ko DG, Khursan SL. Quantum-chemical calculations of the structure of trioxyl radicals. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2008. [DOI: 10.1134/s0036024408080074] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Derro EL, Sechler TD, Murray C, Lester MI. Observation of ν1+νn combination bands of the HOOO and DOOO radicals using infrared action spectroscopy. J Chem Phys 2008; 128:244313. [DOI: 10.1063/1.2945872] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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20
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Derro EL, Sechler TD, Murray C, Lester MI. Infrared Action Spectroscopy of the OD Stretch Fundamental and Overtone Transitions of the DOOO Radical. J Phys Chem A 2008; 112:9269-76. [DOI: 10.1021/jp801232a] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Erika L. Derro
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Timothy D. Sechler
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Craig Murray
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Marsha I. Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
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22
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23
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Braams BJ, Yu HG. Potential energy surface and quantum dynamics study of rovibrational states for HO3 (X 2A″). Phys Chem Chem Phys 2008; 10:3150-5. [DOI: 10.1039/b801928b] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Chalmet S, Ruiz-López MF. The structures of ozone and HOx radicals in aqueous solution from combined quantum/classical molecular dynamics simulations. J Chem Phys 2007; 124:194502. [PMID: 16729820 DOI: 10.1063/1.2198818] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Ozone in aqueous solution decomposes through a complex mechanism that involves initial reaction with a hydroxide ion followed by formation of a variety of oxidizing species such as HO, HO(2), and HO(3) radicals. Though a number of hydrogen-bonded complexes have been described in the gas phase, both theoretically and experimentally, the structures of ozone and HO(x) in liquid water remain uncertain. In this work, combined quantum/classical computer simulations of aqueous solutions of these species have been reported. The results show that ozone undergoes noticeable electron polarization but it does not participate in hydrogen bonds with liquid water. The main contribution of the solvation energy comes from dispersion forces. In contrast, HO(x) radicals form strong hydrogen bonds. They are better proton donors but weaker proton acceptors than water. Their electronic and geometrical structures are significantly modified by the solvent, especially in the case of HO(3). In all cases, fluctuations in amplitudes of electronic properties are considerable, suggesting that solvent effects might play a crucial role on oxidation mechanisms initiated by ozone in liquid water. These mechanisms are important in a broad range of domains, such as atmospheric processes, plant response to ambient ozone, and medical and industrial applications.
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Affiliation(s)
- Stéphanie Chalmet
- Equipe de Chimie et Biochimie Théoriques, UMR CNRS-UHP No. 7565, Université Henri Poincaré, Nancy I, BP 239, 54506 Vandoeuvre-lès-Nancy Cedex, France
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25
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Murray C, Derro EL, Sechler TD, Lester MI. Stability of the Hydrogen Trioxy Radical via Infrared Action Spectroscopy. J Phys Chem A 2007; 111:4727-30. [PMID: 17503792 DOI: 10.1021/jp071473w] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The hydrogen trioxy radical (HO3) has been proposed as an intermediate in several important chemical reactions and relaxation processes involving OH in the atmosphere. In this work, the gas-phase infrared action spectrum of HO3 is obtained in the OH overtone region, along with the product state distribution of the OH fragment following dissociation. The highest observed OH product channel sets an upper limit for the HO-O2 binding energy of 6.12 kcal mol(-1). The experimental stability of HO3 and derived equilibrium constant imply that up to 66% of atmospheric OH may be converted into HO3 in the tropopause region.
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26
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Xu Z, Lin M. Ab initio study on the kinetics and mechanisms for O3 reactions with HO2 and HNO. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.04.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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27
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Mansergas A, Anglada JM, Olivella S, Ruiz-López MF, Martins-Costa M. On the nature of the unusually long OO bond in HO3 and HO4 radicals. Phys Chem Chem Phys 2007; 9:5865-73. [DOI: 10.1039/b711464h] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Yang J, Li QS, Zhang S. Ab initio study on the decomposition of first excited state HOOO radicals. Phys Chem Chem Phys 2007; 9:466-9. [PMID: 17216062 DOI: 10.1039/b612045h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The HOOO radical plays a crucial role in atmospheric processes involving the OH radical and O(2) molecule. We present an ab initio molecular orbital theory study on the decomposition reaction of the first excited state HOOO((2)A') with respect to OH and O(2). The geometries and harmonic vibrational frequencies of all stationary points are calculated at the CASSCF and MRCI levels of theory in conjunction with the 6-31+G(d,p) basis set. The potential energy profile of the decomposition reaction is studied at the CASSCF/6-31+G(d,p) level of theory, in which the complete valence orbitals and electrons are included in the active space. The energies of the potential energy profile are further refined at the CASPT2 and MRCI levels of the theory. Additionally, we have determined the interesting reaction process: the HOOO((2)A') radical with C(s) symmetry does not dissociate to OH((2)Pi) and O(2)((3)Sigma(-)(g)) directly as this is forbidden by orbital symmetry, but dissociates to OH((2)Pi) and O(2)((3)Sigma(-)(g)) via the change in symmetry from C(s) to C(infinity v) symmetry with a low barrier.
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Affiliation(s)
- Jing Yang
- Institute for Chemical Physics, Beijing Institute of Technology, Beijing, 100081, People's Republic of China
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29
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Denis PA. Thermochemistry of the Hypobromous and Hypochlorous Acids, HOBr and HOCl. J Phys Chem A 2006; 110:5887-92. [PMID: 16640385 DOI: 10.1021/jp056950u] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The enthalpies of formation of HOBr and HOCl have been estimated by employing coupled cluster theory in conjunction with the correlation consistent basis sets and corrections for core-valence, relativistic, and anharmonic effects. We have employed three different reactions to estimate the DeltaH(o)(f,298)(HOBr), namely, the atomization reaction and two homodesmic reactions. Our best estimation is DeltaH(o)(f,298) (HOBr) = -15.3 +/- 0.6 kcal/mol and is very likely to lie toward the more negative values. The present value is 1.4 kcal/mol lower than the widely used experimental determination of Ruscic and Berkowitz (J. Chem. Phys. 1994, 101, 7795), DeltaH(o)(f,298)(HOBr) > -13.93 +/- 0.42 kcal/mol. However, it is closer to the more recent measurement of Lock et al. (J. Phys. Chem. 1996, 100, 7972), DeltaH(o)(f,298)(HOBr) = -14.8 +/- 1 kcal/mol. In the case of HOCl we have determined DeltaH(o)(f,298)(HOCl) = -18.1 +/- 0.3 kcal/mol, just in the middle of the two experimental values proposed, -17.8 +/- 0.5 kcal/mol (JANAF), obtained from equilibrium constant measurements, and -18.36 +/- 0.03 kcal/mol (Joens, J. A. J. Phys. Chem. A 2001, 105, 11041), determined from the measurements of the Cl-OH bond energy. If our conclusions are correct, several enthalpies of formation that have been determined by experimental chemists, Orlando and Burholder (J. Phys. Chem. 1995, 99, 1143), and theoretical chemists, Lee (J. Phys. Chem. 1995, 99, 15074), need to be revised, since a larger value was used for DeltaH(o)(f,298)(HOBr). Employing the results obtained by Orlando and Burkholder for Br(2)O we propose DeltaH(o)(f,298)(Br(2)O) = 24.9 +/- 0.6 kcal/mol, and employing Lee's enthalpies of reaction we propose the following DeltaH(o)(f,298): for BrBrO, HBrO, ClOBr, ClBrO, BrClO, BrCN, BrNC, BrNO, BrON, FOBr, and FBrO, 39.5 +/- 1, 41.0 +/- 1, 22.7 +/- 1.5, 34.2 +/- 1.5, 40.9 +/- 1.5, 43.7 +/- 1.5, 80.1 +/- 1.5, 22.3 +/- 1, 46.2 +/- 1, 17.3 +/- 1.5, and 6.3 +/- 1.5 kcal/mol, respectively. We expect that this work will stimulate new experimental measurements of the thermodynamic properties of HOBr and HOCl.
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Affiliation(s)
- Pablo A Denis
- DEQUIFIM, Facultad de Química, UDELAR, CC 1157, Montevideo, Uruguay.
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30
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McCabe D, Smith I, Rajakumar B, Ravishankara A. Rate coefficients for the relaxation of OH (v=1) by O2 at temperatures from 204–371K and by N2O from 243–372K. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.01.037] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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31
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Abstract
The HOOO radical is supposed to play a role in ozone chemistry, both in the gas phase and aqueous media. We discuss the influence of the solvent on the electronic and geometrical structure of this radical using density functional and high-level ab initio calculations together with continuum, discrete, and discrete-continuum solvent models. Solute-solvent electrostatic interactions are shown to be fundamental, and lead to a noticeable stabilization of the radical, which should adopt a trans conformation in aqueous media. In fact, no energy minimum for the cis conformation is predicted in these conditions.
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32
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Janoschek R, Fabian WM. Enthalpies of formation of small free radicals and stable intermediates: Interplay of experimental and theoretical values. J Mol Struct 2006. [DOI: 10.1016/j.molstruc.2005.04.050] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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33
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Carty D, Goddard A, Köhler SPK, Sims IR, Smith IWM. Kinetics of the Radical−Radical Reaction, O(3PJ) + OH(X2ΠΩ) → O2 + H, at Temperatures down to 39 K. J Phys Chem A 2005; 110:3101-9. [PMID: 16509632 DOI: 10.1021/jp054429u] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The kinetics of the reaction between O atoms and OH radicals, both in their electronic ground state, have been investigated at temperatures down to ca. 39 K. The experiments employed a CRESU (Cinétique deRéaction en Ecoulement Supersonique Uniforme) apparatus to attain low temperatures. Both reagents were created using pulsed laser photolysis at 157.6 nm of mixtures containing H2O and O2 diluted in N2 carrier gas. OH radicals were formed by both direct photolysis of H2O and the reaction between O(1D) atoms and H2O. O(3P) atoms were formed both as a direct product of O2 photolysis and by the rapid quenching of O(1D) atoms formed in that photolysis by N2 and O2. The rates of removal of OH radicals were observed by laser-induced fluorescence, and concentrations of O atoms were estimated from a knowledge of the absorption cross-section for O2 at 157.6 nm and of the measured fluence from the F2 laser at this wavelength. To obtain a best estimate of the rate constants for the O + OH reaction, we had to correct the raw experimental data for the following: (a) the decrease in the laser fluence along the jet due to the absorption by O2 in the gas mixture, (b) the increase in temperature, and consequent decrease in gas density, as a result of energy released in the photochemical and chemical processes that occurred, and (c) the formation of OH(v = 0) as a result of relaxation, particularly by O2, of OH radicals formed in levels v > 0. Once these corrections were made, the rate constant for reaction between OH and O(3P) atoms showed little variation in the temperature range of 142 to 39 K and had a value of (3.5 +/- 1.0) x 10(-11) cm3 molecule(-1) s(-1). It is recommended that this value is used in future chemical models of dense interstellar clouds.
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Affiliation(s)
- David Carty
- School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
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Sun D, Schneider WF, Adams JB, Sengupta D. Molecular Origins of Selectivity in the Reduction of NOx by NH3. J Phys Chem A 2004. [DOI: 10.1021/jp049079a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Donghai Sun
- Department of Chemical and Materials Engineering, Arizona State University, Tempe, Arizona 85287, Physical and Environmental Sciences Department, Ford Motor Company, Mail Drop 3083/SRL, Dearborn, Michigan 48121-2053, and CFD Research Corporation, 215 Wynn Drive, Huntsville, Alabama 35805
| | - William F. Schneider
- Department of Chemical and Materials Engineering, Arizona State University, Tempe, Arizona 85287, Physical and Environmental Sciences Department, Ford Motor Company, Mail Drop 3083/SRL, Dearborn, Michigan 48121-2053, and CFD Research Corporation, 215 Wynn Drive, Huntsville, Alabama 35805
| | - James B. Adams
- Department of Chemical and Materials Engineering, Arizona State University, Tempe, Arizona 85287, Physical and Environmental Sciences Department, Ford Motor Company, Mail Drop 3083/SRL, Dearborn, Michigan 48121-2053, and CFD Research Corporation, 215 Wynn Drive, Huntsville, Alabama 35805
| | - Debasis Sengupta
- Department of Chemical and Materials Engineering, Arizona State University, Tempe, Arizona 85287, Physical and Environmental Sciences Department, Ford Motor Company, Mail Drop 3083/SRL, Dearborn, Michigan 48121-2053, and CFD Research Corporation, 215 Wynn Drive, Huntsville, Alabama 35805
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Denis PA. On the performance of CCSD(T) and CCSDT in the study of molecules with multiconfigurational character: halogen oxides, HSO, BN and O3. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.07.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Denis PA, Kieninger M, Ventura ON, Cachau RE, Diercksen GH. Erratum to: ‘Complete basis set and density functional determination of the enthalpy of formation of the controversial HO3 radical. A discrepancy between theory and experiment’ [Chem. Phys. Lett. 365 (2002) 440–449]. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)01078-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Filatov M, Cremer D. Bonding in the ClOO(2A″) and BrOO(2A″) radical: Nonrelativistic single-reference versus relativistic multi-reference descriptions in density functional theory. Phys Chem Chem Phys 2003. [DOI: 10.1039/b301627g] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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