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Perrin A, Manceron L, Armante R, Kwabia-Tchana F, Roy P, Doizi D. First analysis of the ν 2+ν 7 and ν 2+ν 9 and ν 2+ν 6 combination bands of HNO 3: evidence of perturbations due to large amplitude OH torsion in the 2 19 1 excited state. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1987543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- A. Perrin
- Laboratoire de Météorologie Dynamique/IPSL, Ecole Polytechnique, Université Paris-Saclay, Palaiseau Cedex, France
| | - L. Manceron
- Ligne AILES, Synchrotron SOLEIL, L’Orme des Merisiers, Gif-sur-Yvette Cedex, France
- MONARIS, Sorbonne Université, CNRS, Paris, France
| | - R. Armante
- Laboratoire de Météorologie Dynamique/IPSL, Ecole Polytechnique, Université Paris-Saclay, Palaiseau Cedex, France
| | - F. Kwabia-Tchana
- LISA, Université de Paris and Univ Paris Est Creteil, CNRS, Paris, France
| | - P. Roy
- Ligne AILES, Synchrotron SOLEIL, L’Orme des Merisiers, Gif-sur-Yvette Cedex, France
| | - D. Doizi
- DEN-Service d’Etude du Comportement des Radionucléides (SECR), CEA, Université Paris-Saclay, Gif-sur-Yvette, France
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2
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Franke PR, Duncan MA, Douberly GE. Infrared photodissociation spectroscopy and anharmonic vibrational study of the HO 4 + molecular ion. J Chem Phys 2020; 152:174309. [PMID: 32384862 DOI: 10.1063/5.0005975] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Molecular cations of HO4 + and DO4 + are produced in a supersonic expansion. They are mass-selected, and infrared photodissociation spectra of these species are measured with the aid of argon-tagging. Although previous theoretical studies have modeled these systems as proton-bound dimers of molecular oxygen, infrared spectra have free OH stretching bands, suggesting other isomeric structures. As a consequence, we undertook extensive computational studies. Our conformer search used a composite method based on an economical combination of single- and multi-reference theories. Several conformers were located on the quintet, triplet, and singlet surfaces, spanning in energy of only a few thousand wavenumbers. Most of the singlet and triplet conformers have pronounced multiconfigurational character. Previously unidentified covalent-like structures (H-O-O-O-O) on the singlet and triplet surfaces likely represent the global minima. In our experiments, HO4 + is formed in a relatively hot environment, and similar experiments have been shown capable of producing multiple conformers in low-lying electronic states. None of the predicted HO4 + isomers can be ruled out a priori based on energetic arguments. We interpret our argon-tagged spectra with Second-Order Vibrational Perturbation Theory with Resonances (VPT2+K). The presence of one or more covalent-like isomers is the only reasonable explanation for the spectral features observed.
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Affiliation(s)
- Peter R Franke
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Michael A Duncan
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Gary E Douberly
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
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3
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Raghunandan R, Orphal J, Ruth AA. New bands of deuterated nitrous acid (DONO) in the near-infrared using FT-IBBCEAS. Chem Phys Lett 2020. [DOI: 10.1016/j.cpletx.2020.100050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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4
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Puzzarini C, Bloino J, Tasinato N, Barone V. Accuracy and Interpretability: The Devil and the Holy Grail. New Routes across Old Boundaries in Computational Spectroscopy. Chem Rev 2019; 119:8131-8191. [DOI: 10.1021/acs.chemrev.9b00007] [Citation(s) in RCA: 114] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Cristina Puzzarini
- Dipartimento di Chimica “Giacomo Ciamician”, Università di Bologna, Via F. Selmi 2, I-40126 Bologna, Italy
| | - Julien Bloino
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| | - Nicola Tasinato
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| | - Vincenzo Barone
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
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5
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Affiliation(s)
- Emil Vogt
- Department of Chemistry, University of Copenhagen, Copenhagen Ø, Denmark
| | - Daniel S. Sage
- Department of Mathematics, Louisiana State University, Baton Rouge, LA, USA
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6
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Hirshberg B, Sagiv L, Gerber RB. Approximate Quantum Dynamics using Ab Initio Classical Separable Potentials: Spectroscopic Applications. J Chem Theory Comput 2017; 13:982-991. [DOI: 10.1021/acs.jctc.6b01129] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Barak Hirshberg
- Institute
of Chemistry and the Fritz Haber Center for Molecular Dynamics, The Hebrew University, Jerusalem 9190401, Israel
| | - Lior Sagiv
- Institute
of Chemistry and the Fritz Haber Center for Molecular Dynamics, The Hebrew University, Jerusalem 9190401, Israel
| | - R. Benny Gerber
- Institute
of Chemistry and the Fritz Haber Center for Molecular Dynamics, The Hebrew University, Jerusalem 9190401, Israel
- Department
of Chemistry, University of California, Irvine, California 92697, United States
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7
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Xiao H, Maeda S, Morokuma K. Theoretical insight into the wavelength-dependent photodissociation mechanism of nitric acid. Phys Chem Chem Phys 2016; 18:24582-90. [DOI: 10.1039/c6cp04713k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The MS-CASPT2 method is used to study O(1D) + HONO and OH + NO2 photodissociation pathways of HNO3 in the four lowest electronic singlet states.
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Affiliation(s)
- Hongyan Xiao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- People's Republic of China
| | - Satoshi Maeda
- Department of Chemistry
- Faculty of Science
- Hokkaido University
- Sapporo 060-0810
- Japan
| | - Keiji Morokuma
- Fukui Institute for Fundamental Chemistry
- Kyoto University
- Kyoto 606-8103
- Japan
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry
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8
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Bloino J. A VPT2 Route to Near-Infrared Spectroscopy: The Role of Mechanical and Electrical Anharmonicity. J Phys Chem A 2015; 119:5269-87. [DOI: 10.1021/jp509985u] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Julien Bloino
- Consiglio
Nazionale delle Ricerche, Istituto di Chimica dei Composti OrganoMetallici
(ICCOM-CNR), UOS di Pisa,
Area della Ricerca CNR, Via G. Moruzzi
1, 56124 Pisa, Italy
- Scuola Normale Superiore, piazza dei Cavalieri 7, I-56126 Pisa, Italy
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9
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Pavlyuchko A, Yurchenko S, Tennyson J. Hybrid variational–perturbation method for calculating ro-vibrational energy levels of polyatomic molecules. Mol Phys 2015. [DOI: 10.1080/00268976.2014.992485] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- A.I. Pavlyuchko
- Department of Physics and Astronomy, Moscow State University of Civil Engineering (MGSU), Moscow, Russia
- Department of Physics and Astronomy, University College London, London, UK
| | - S.N. Yurchenko
- Department of Physics and Astronomy, University College London, London, UK
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, London, UK
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10
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Chang K, Jung YM, Chung H. Two-dimensional correlation analysis to study variation of near-infrared water absorption bands in the presence of inorganic acids. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2013.12.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Medvedev ES. Towards understanding the nature of the intensities of overtone vibrational transitions. J Chem Phys 2012; 137:174307. [DOI: 10.1063/1.4761930] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Tasinato N, Regini G, Stoppa P, Charmet AP, Gambi A. Anharmonic force field and vibrational dynamics of CH2F2 up to 5000 cm−1 studied by Fourier transform infrared spectroscopy and state-of-the-art ab initio calculations. J Chem Phys 2012; 136:214302. [DOI: 10.1063/1.4720502] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Kołaski M, Zakharenko AA, Karthikeyan S, Kim KS. Structures, Energetics, and IR Spectra of Monohydrated Inorganic Acids: Ab initio and DFT Study. J Chem Theory Comput 2011; 7:3447-59. [DOI: 10.1021/ct100428z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maciej Kołaski
- Center for Superfunctional Materials, Department of Chemistry, Pohang University of Science and Technology, San 31, Hyojadong, Namgu, 790-784 Pohang, South Korea
| | - Aleksey A. Zakharenko
- Center for Superfunctional Materials, Department of Chemistry, Pohang University of Science and Technology, San 31, Hyojadong, Namgu, 790-784 Pohang, South Korea
| | - S. Karthikeyan
- Center for Superfunctional Materials, Department of Chemistry, Pohang University of Science and Technology, San 31, Hyojadong, Namgu, 790-784 Pohang, South Korea
| | - Kwang S. Kim
- Center for Superfunctional Materials, Department of Chemistry, Pohang University of Science and Technology, San 31, Hyojadong, Namgu, 790-784 Pohang, South Korea
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14
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Xantheas SS. Anharmonic vibrational spectra of hydrogen bonded clusters: comparison between higher energy derivative and mean-field grid based methods. INT REV PHYS CHEM 2010. [DOI: 10.1080/01442350600922564] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Sotiris S. Xantheas
- a Chemical Sciences Division , Pacific Northwest National Laboratory , 902 Battelle Boulevard, PO Box 999, MS K1-83, Richland , WA, 99352 , USA
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15
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Matthews DA, Vázquez J, Stanton JF. Calculated stretching overtone levels and Darling–Dennison resonances in water: a triumph of simple theoretical approaches. Mol Phys 2010. [DOI: 10.1080/00268970701618424] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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16
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Lane JR, Kjaergaard HG. XH-stretching overtone transitions calculated using explicitly correlated coupled cluster methods. J Chem Phys 2010; 132:174304. [DOI: 10.1063/1.3408192] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Kalemos A, Mavridis A. Bonding Elucidation of the Three Common Acids H2SO4, HNO3, and HClO4. J Phys Chem A 2009; 113:13972-5. [DOI: 10.1021/jp906294d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Apostolos Kalemos
- National and Kapodistrian University of Athens, Department of Chemistry, Laboratory of Physical Chemistry, PO Box 64 004, 157 10 Zografou, Athens, Greece
| | - Aristides Mavridis
- National and Kapodistrian University of Athens, Department of Chemistry, Laboratory of Physical Chemistry, PO Box 64 004, 157 10 Zografou, Athens, Greece
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18
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Dunn ME, Shields GC, Takahashi K, Skodje RT, Vaida V. Experimental and Theoretical Study of the OH Vibrational Spectra and Overtone Chemistry of Gas-Phase Vinylacetic Acid. J Phys Chem A 2008; 112:10226-35. [DOI: 10.1021/jp805746t] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Meghan E. Dunn
- Department of Chemistry and Biochemistry, University of Colorado, Campus Box 215, Boulder, Colorado 80309, CIRES, University of Colorado, Campus Box 215, Boulder, Colorado 80309, and Dean’s Office and Department of Chemistry and Physics, College of Science and Technology, Armstrong Atlantic State University, 11935 Abercorn Street, Savannah, Georgia 31419
| | - George C. Shields
- Department of Chemistry and Biochemistry, University of Colorado, Campus Box 215, Boulder, Colorado 80309, CIRES, University of Colorado, Campus Box 215, Boulder, Colorado 80309, and Dean’s Office and Department of Chemistry and Physics, College of Science and Technology, Armstrong Atlantic State University, 11935 Abercorn Street, Savannah, Georgia 31419
| | - Kaito Takahashi
- Department of Chemistry and Biochemistry, University of Colorado, Campus Box 215, Boulder, Colorado 80309, CIRES, University of Colorado, Campus Box 215, Boulder, Colorado 80309, and Dean’s Office and Department of Chemistry and Physics, College of Science and Technology, Armstrong Atlantic State University, 11935 Abercorn Street, Savannah, Georgia 31419
| | - Rex T. Skodje
- Department of Chemistry and Biochemistry, University of Colorado, Campus Box 215, Boulder, Colorado 80309, CIRES, University of Colorado, Campus Box 215, Boulder, Colorado 80309, and Dean’s Office and Department of Chemistry and Physics, College of Science and Technology, Armstrong Atlantic State University, 11935 Abercorn Street, Savannah, Georgia 31419
| | - Veronica Vaida
- Department of Chemistry and Biochemistry, University of Colorado, Campus Box 215, Boulder, Colorado 80309, CIRES, University of Colorado, Campus Box 215, Boulder, Colorado 80309, and Dean’s Office and Department of Chemistry and Physics, College of Science and Technology, Armstrong Atlantic State University, 11935 Abercorn Street, Savannah, Georgia 31419
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19
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Seidler P, Hansen MB, Christiansen O. Towards fast computations of correlated vibrational wave functions: Vibrational coupled cluster response excitation energies at the two-mode coupling level. J Chem Phys 2008; 128:154113. [DOI: 10.1063/1.2907860] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Kjaergaard HG, Garden AL, Chaban GM, Gerber RB, Matthews DA, Stanton JF. Calculation of Vibrational Transition Frequencies and Intensities in Water Dimer: Comparison of Different Vibrational Approaches. J Phys Chem A 2008; 112:4324-35. [DOI: 10.1021/jp710066f] [Citation(s) in RCA: 152] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
| | | | - Galina M. Chaban
- NASA Ames Research Center, Mail Stop T27B-1, Moffett Field, California 94035-1000
| | - R. Benny Gerber
- Department of Chemistry, University of California, Irvine, California 92697 and Department of Physical Chemistry and The Fritz Haber Research Center, The Hebrew University, Jerusalem 91904, Israel
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21
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Kamboures MA, Raff JD, Miller Y, Phillips LF, Finlayson-Pitts BJ, Gerber RB. Complexes of HNO3 and NO3− with NO2 and N2O4, and their potential role in atmospheric HONO formation. Phys Chem Chem Phys 2008; 10:6019-32. [DOI: 10.1039/b805330h] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Namkung H, Lee Y, Chung H. Improving prediction selectivity for on-line near-infrared monitoring of components in etchant solution by spectral range optimization. Anal Chim Acta 2007; 606:50-6. [PMID: 18068770 DOI: 10.1016/j.aca.2007.10.047] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2007] [Revised: 10/29/2007] [Accepted: 10/30/2007] [Indexed: 11/17/2022]
Abstract
The components (H3PO4, HNO3, CH3COOH and water) in an etchant solution have been accurately measured in an on-line manner using near-infrared (NIR) spectroscopy by directly illuminating NIR radiation through a Teflon line. In particular, the spectral features according to the change of H3PO4 or HNO3 concentrations were not mainly from NIR absorption themselves, but from the perturbation (or displacement) of water bands; therefore, the resulting spectral variations were quite similar to each other. Consequently partial least squares (PLS) prediction selectivity among the components should be the most critical issue for continuous on-line compositional monitoring by NIR spectroscopy. To improve selectivity of the calibration model, we have optimized the calibration models by finding selective spectral ranges with the use of moving window PLS. Using the optimized PLS models for each component, the resulting prediction accuracies were substantially improved. Furthermore, on-line prediction selectivity was evaluated by spiking individual pure components step by step and examining the resulting prediction trends. When optimized PLS models were used, each concentration was selectively and sensitively varied at each spike; meanwhile, when whole or non-optimized ranges were used for PLS, the prediction selectivity was greatly degraded. This study verifies that the selection of an optimal spectral range for PLS is the most important factor to make Teflon-based NIR measurements successful for on-line and real-time monitoring of etching solutions.
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Affiliation(s)
- Hankyu Namkung
- Department of Chemistry, College of Natural Sciences, Hanyang University, Haengdang-Dong, Seongdong-Gu, Seoul 133-791, Republic of Korea
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23
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Chen C, Shepler BC, Braams BJ, Bowman JM. Quasiclassical trajectory calculations of the OH+NO2 association reaction on a global potential energy surface. J Chem Phys 2007; 127:104310. [PMID: 17867750 DOI: 10.1063/1.2764076] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report a full-dimensional potential energy surface (PES) for the OH+NO(2) reaction based on fitting more than 55,000 energies obtained with density functional theory-B3LYP6-311G(d,p) calculations. The PES is invariant with respect to permutation of like nuclei and describes all isomers of HOONO, HONO(2), and the fragments OH+NO(2) and HO(2)+NO. Detailed comparison of the structures, energies, and harmonic frequencies of various stationary points on the PES are made with previous and present high-level ab initio calculations. Two hydrogen-bond complexes are found on the PES and confirmed by new ab initio CASPT2 calculations. Quasiclassical trajectory calculations of the cross sections for ground rovibrational OH+NO(2) association reactions to form HOONO and HONO(2) are done using this PES. The cross section to form HOONO is larger than the one to form HONO(2) at low collision energies but the reverse is found at higher energies. The enhancement of the HOONO complex at low collision energies is shown to be due, in large part, to the transient formation of a H-bond complex, which decays preferentially to HOONO. The association cross sections are used to obtain rate constants for formation of HOONO and HONO(2) for the ground rovibrational states in the high-pressure limit.
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Affiliation(s)
- Chao Chen
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, USA
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Zhang X, Nimlos MR, Ellison GB, Varner ME, Stanton JF. Vibrational overtone spectrum of matrix isolated cis, cis-HOONO. J Chem Phys 2007; 126:174308. [PMID: 17492864 DOI: 10.1063/1.2720392] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Cis, cis-peroxynitrous acid is known to be an intermediate in atmospheric reactions between OH and NO2 as well as HOO and NO. The infrared absorption spectra of matrix-isolated cc-HOONO and cc-DOONO in argon have been observed in the range of 500-8000 cm-1. Besides the seven fundamental vibrational modes that have been assigned earlier for this molecule [Zhang et al., J. Chem. Phys. 124, 084305 (2006)], more than 50 of the overtone and combination bands have been observed for cc-HOONO and cc-DOONO. Ab initio CCSD(T)/atomic natural orbital anharmonic force field calculations were used to help guide the assignments. Based on this study of the vibrational overtone transitions of cis, cis-HOONO that go as high as 8000 cm-1 and the earlier paper on the vibrational fundamentals, we conclude that the CCSD(T)/ANO anharmonic frequencies seem to correct to +/-35 cm-1. The success of the theoretically predicted anharmonic frequencies {upsilon} in assigning overtone spectra of HOONO up to 8000 cm-1 suggests that the CCSD(T)/ANO method is producing a reliable potential energy surface for this reactive molecule.
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Affiliation(s)
- Xu Zhang
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, USA.
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Christiansen O. Vibrational structure theory: new vibrational wave function methods for calculation of anharmonic vibrational energies and vibrational contributions to molecular properties. Phys Chem Chem Phys 2007; 9:2942-53. [PMID: 17551617 DOI: 10.1039/b618764a] [Citation(s) in RCA: 190] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A number of recently developed theoretical methods for the calculation of vibrational energies and wave functions are reviewed. Methods for constructing the appropriate quantum mechanical Hamilton operator are briefly described before reviewing a particular branch of theoretical methods for solving the nuclear Schrödinger equation. The main focus is on wave function methods using the vibrational self-consistent field (VSCF) as starting point, and includes vibrational configuration interaction (VCI), vibrational Møller-Plesset (VMP) theory, and vibrational coupled cluster (VCC) theory. The convergence of the different methods towards the full vibrational configuration interaction (FVCI) result is discussed. Finally, newly developed vibrational response methods for calculation of vibrational contributions to properties, energies, and transition probabilities are discussed.
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Affiliation(s)
- Ove Christiansen
- The Lundbeck Foundation Center for Theoretical Chemistry, Department of Chemistry, Aarhus University, DK-8000 Arhus C, Denmark
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Konen IM, Li EXJ, Lester MI, Vázquez J, Stanton JF. Infrared overtone spectroscopy and vibrational analysis of a Fermi resonance in nitric acid: Experiment and theory. J Chem Phys 2006; 125:074310. [PMID: 16942342 DOI: 10.1063/1.2234772] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
High resolution infrared spectra of nitric acid have been recorded in the first OH overtone region under jet-cooled conditions using a sequential IR-UV excitation method. Vibrational bands observed at 6933.39(3), 6938.75(4), and 6951.985(3) cm(-1) (origins) with relative intensities of 0.42(1), 0.38(1), and 0.20(1) are attributed to strongly mixed states involved in a Fermi resonance. A vibrational deperturbation analysis suggests that the optically bright OH overtone stretch (2nu1) at 6939.2(1) cm(-1) is coupled directly to the nu1 + 2nu2 state at 6946.4(1) cm(-1) and indirectly to the 3nu2 + nu3 + nu7 state at 6938.5(1) cm(-1). Both the identity of the zero-order states and the indirect coupling scheme are deduced from complementary CCSD(T) calculations in conjunction with second-order vibrational perturbation theory. The deperturbation analysis also yields the experimental coupling between 2nu1 and nu1 + 2nu2 of -6.9(1) cm(-1), and that between the two dark states of +5.0(1) cm(-1). The calculated vibrational energies and couplings are in near quantitative agreement with experimentally derived values except for a predicted twofold stronger coupling of 2nu1 to nu1 + 2nu2. Weaker coupling of the strongly mixed states to a dense background of vibrational states via intramolecular vibrational energy redistribution is evident from the experimental linewidths of 0.08 and 0.25 cm(-1) for the higher energy and two overlapping lower energy bands, respectively. A comprehensive rotational analysis of the higher energy band yields spectroscopic parameters and the direction of the OH overtone transition dipole moment.
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Affiliation(s)
- Ian M Konen
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA
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