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Sit MK, Das S, Samanta K. Machine Learning-Assisted Mixed Quantum-Classical Dynamics without Explicit Nonadiabatic Coupling: Application to the Photodissociation of Peroxynitric Acid. J Phys Chem A 2024; 128:8244-8253. [PMID: 39283987 DOI: 10.1021/acs.jpca.4c02876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2024]
Abstract
We have devised a hybrid quantum-classical scheme utilizing machine-learned potential energy surfaces (PES), which circumvents the need for explicit computation of nonadiabatic coupling elements. The quantities necessary to account for the nonadiabatic effects are directly obtained from the PESs. The simulation of dynamics is based on the fewest-switches surface-hopping method. We applied this scheme to model the photodissociation of both N-O and O-O bonds in a conformer of peroxynitric acid (HO2NO2). Adiabatic PES data for the six lowest states of this molecule were computed at the CASSCF level for various nuclear configurations. These served as the training data for the machine-learning models for the PESs. The dynamics simulation was initiated on the lowest optically bright singlet excited state (S4) and propagated along the two Jacobi coordinates J → 1 and J → 2 while accounting for the nonadiabatic effects through transitions between PESs. Our analysis revealed that there is a very high chance of dissociation of the N-O bond leading to the HO2 and NO2 fragments.
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Affiliation(s)
- Mahesh K Sit
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Argul, Odisha 752050, India
| | - Subhasish Das
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Argul, Odisha 752050, India
| | - Kousik Samanta
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Argul, Odisha 752050, India
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2
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Hansen AS, Huchmala RM, Vogt E, Boyer MA, Bhagde T, Vansco MF, Jensen CV, Kjærsgaard A, Kjaergaard HG, McCoy AB, Lester MI. Coupling of torsion and OH-stretching in tert-butyl hydroperoxide. I. The cold and warm first OH-stretching overtone spectrum. J Chem Phys 2021; 154:164306. [DOI: 10.1063/5.0048020] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Anne S. Hansen
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA
| | - Rachel M. Huchmala
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA
| | - Emil Vogt
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Mark A. Boyer
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA
| | - Trisha Bhagde
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA
| | - Michael F. Vansco
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA
| | - Casper V. Jensen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Alexander Kjærsgaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Henrik G. Kjaergaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Anne B. McCoy
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA
| | - Marsha I. Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA
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3
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O2- and CO-rich Atmospheres for Potentially Habitable Environments on TRAPPIST-1 Planets. ACTA ACUST UNITED AC 2020. [DOI: 10.3847/1538-4357/ab5f07] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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4
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Nunes CM, Reva I, Fausto R. Conformational isomerizations triggered by vibrational excitation of second stretching overtones. Phys Chem Chem Phys 2019; 21:24993-25001. [PMID: 31710324 DOI: 10.1039/c9cp05070a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Vibrational excitation using frequency-tunable IR laser light has been developed as a powerful tool for selective manipulation of molecular conformations. In this methodology, vibrational excitation has been typically applied to the first stretching overtones (∼80 kJ mol-1) but also to the fundamental modes (∼40 kJ mol-1). Here, we demonstrate that selective conformational isomerizations are also achieved using excitation to second stretching overtones (∼120 kJ mol-1). The extremely weak absorptions of the second stretching overtones of molecules isolated in low-temperature matrices were measured for the first time; here using three prototype molecules: hydroxyacetone (HA), glycolic acid (GAc) and glycolamide (GAm). Benchmarking of computed anharmonic IR spectra showed that the B3LYP/SNSD method provides the best agreement with experimental frequencies of the ν(OH), 2ν(OH) and 3ν(OH) modes for the studied molecules in argon matrices. Selective irradiation at the 3ν(OH) frequencies (9850-10 500 cm-1) of HA, GAc and GAm monomers in argon matrices at 15 K successfully triggers their conformational isomerization. These results open the door to extend control over conformations separated by higher barriers and to induce other transformations not energetically accessible by excitation to the fundamental or first stretching overtone modes.
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Affiliation(s)
- Cláudio M Nunes
- CQC, Department of Chemistry, University of Coimbra, 3004-535, Coimbra, Portugal.
| | - Igor Reva
- CQC, Department of Chemistry, University of Coimbra, 3004-535, Coimbra, Portugal.
| | - Rui Fausto
- CQC, Department of Chemistry, University of Coimbra, 3004-535, Coimbra, Portugal.
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5
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Sulfuric acid decomposition chemistry above Junge layer in Earth's atmosphere concerning ozone depletion and healing. Commun Chem 2019. [DOI: 10.1038/s42004-019-0178-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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Shen X, Wang S, Dai K, Shen Y. Nascent rotational distribution for LiH(v=0-3,J) states from collisions with H 2(E=4300 and 4800cm -1). SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 173:516-526. [PMID: 27741492 DOI: 10.1016/j.saa.2016.09.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 08/28/2016] [Accepted: 09/26/2016] [Indexed: 06/06/2023]
Abstract
Rotationally state selective excitation of H2(v=1, J=1 or 3) was achieved by stimulated Raman pumping. The full state-resolved distribution of scattered LiH(v=0-3, J=0~13)molecules from collisions with excited H2(E=4300 and 4800cm-1) is reported. Nascent rotational and translational energy profiles for scattered LiH(v=0~3) molecules with J=0~13 were measured using high-resolution transient laser induced fluorescence(LIF). The product translational energy for individual J-states increases by 120% for a 13% increase in donor energy. The scattered LiH(v=0, J=0~13) molecules have a biexponential rotational distribution. Fitting the data with a two-component exponential model yields a low-energy distribution and a high-energy distribution. The rotational distribution is sensitive to donor energy. Rotational distributions of scatted LiH(v=1-3) molecules were also measured. The distribution yielded rotational temperatures at 690K for LiH/H2(E=4300cm-1) and 730K for LiH/H2(E=4800cm-1), respectively. The rate constants for appearance LiH(v=0-3,J) were determined.
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Affiliation(s)
- Xiaoyan Shen
- School of Chemistry and Molecular Engineering, East China University of Sci.&Tech., Shanghai, 200237, China
| | - Shuying Wang
- School of Physics, Xinjiang University, Urumqi, 830046, China
| | - Kang Dai
- School of Physics, Xinjiang University, Urumqi, 830046, China
| | - Yifan Shen
- School of Physics, Xinjiang University, Urumqi, 830046, China
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8
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Wei WM, Zheng RH, Wu YK, Yang F, Hong S. Theoretical Study on Dissociation Potential Energy Surface of Peroxynitric Acid. CHINESE J CHEM PHYS 2014. [DOI: 10.1063/1674-0068/27/06/659-662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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9
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Vaida V, Donaldson DJ. Red-light initiated atmospheric reactions of vibrationally excited molecules. Phys Chem Chem Phys 2014; 16:827-36. [DOI: 10.1039/c3cp53543f] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Larsen MC, Vaida V. Near Infrared Photochemistry of Pyruvic Acid in Aqueous Solution. J Phys Chem A 2012; 116:5840-6. [DOI: 10.1021/jp2087972] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Molly C. Larsen
- Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder,
Colorado 80309, United States
| | - Veronica Vaida
- Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder,
Colorado 80309, United States
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11
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Edwards P, Evans MJ, Commane R, Ingham T, Stone D, Mahajan AS, Oetjen H, Dorsey JR, Hopkins JR, Lee JD, Moller SJ, Leigh R, Plane JMC, Carpenter LJ, Heard DE. Hydrogen oxide photochemistry in the northern Canadian spring time boundary layer. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011jd016390] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- P. Edwards
- School of Chemistry; University of Leeds; Leeds UK
| | - M. J. Evans
- School of Earth and Environment; University of Leeds; Leeds UK
| | - R. Commane
- School of Chemistry; University of Leeds; Leeds UK
| | - T. Ingham
- School of Chemistry; University of Leeds; Leeds UK
- National Centre for Atmospheric Science; University of Leeds; Leeds UK
| | - D. Stone
- School of Chemistry; University of Leeds; Leeds UK
| | | | - H. Oetjen
- School of Chemistry; University of Leeds; Leeds UK
| | - J. R. Dorsey
- School of Earth, Atmospheric and Environmental Sciences; University of Manchester; Manchester UK
| | - J. R. Hopkins
- Department of Chemistry; University of York; Heslington UK
- National Centre for Atmospheric Science; University of York; Heslington UK
| | - J. D. Lee
- Department of Chemistry; University of York; Heslington UK
- National Centre for Atmospheric Science; University of York; Heslington UK
| | - S. J. Moller
- Department of Chemistry; University of York; Heslington UK
| | - R. Leigh
- Department of Physics and Astronomy; University of Leicester; Leicester UK
| | | | | | - D. E. Heard
- School of Chemistry; University of Leeds; Leeds UK
- National Centre for Atmospheric Science; University of Leeds; Leeds UK
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12
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Wei WM, Zheng RH, Jing YY, Liu YT, Hu JC, Ye Y, Shi Q. Theoretical Study on Raman Spectra of Aqueous Peroxynitric Acid. CHINESE J CHEM PHYS 2011. [DOI: 10.1088/1674-0068/24/05/625-630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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13
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Vaida V, Kjaergaard HG, Feierabend KJ. Hydrated Complexes: Relevance to Atmospheric Chemistry and Climate. INT REV PHYS CHEM 2010. [DOI: 10.1080/0144235031000075780] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Veronica Vaida
- a Department of Chemistry and Biochemistry and CIRES , University of Colorado , Campus Box 215, Boulder , CO , 80309 , USA
| | - Henrik G. Kjaergaard
- b Department of Chemistry , University of Otago , PO Box 56, Dunedin , New Zealand
| | - Karl J. Feierabend
- a Department of Chemistry and Biochemistry and CIRES , University of Colorado , Campus Box 215, Boulder , CO , 80309 , USA
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14
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Gupta P, Lane JR, Kjaergaard HG. Molecular dynamic simulations of OH-stretching overtone induced photodissociation of fluorosulfonic and chlorosulfonic acid. Phys Chem Chem Phys 2010; 12:8277-84. [PMID: 20526505 DOI: 10.1039/c003073m] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We investigate the OH-stretching overtone dynamics of fluorosulfonic acid (FSO(3)H) and chlorosulfonic acid (ClSO(3)H) using classical trajectory simulations. The initial nuclear coordinates and momenta for the trajectories are sampled from anharmonic correlation-corrected vibrational self consistent field (CC-VSCF) wavefunctions. We consider both OH-stretching overtone states and combination states containing a mix of OH-stretching overtones and SOH-bending or OSOH-torsional modes. Our molecular dynamics simulations confirm that photodissociation of these sulfonic acids to form the corresponding hydrogen halides and sulfur trioxide (HF + SO(3) and HCl + SO(3)), is possible via highly vibrationally excited states on a picosecond timescale. Hydrogen-hopping events are also observed in the trajectories whereby the hydrogen atom of the excited OH group is found to migrate to one of the adjacent S=O groups. The transition states, activation energies and dissociation dynamics of FSO(3)H and ClSO(3)H are found to be similar to those of H(2)SO(4). We suggest that these halogenated sulfonic acids should be suitable proxy molecules for an experimental investigation of the OH-stretching overtone induced photodissociation of H(2)SO(4) thought to be important in Earths' atmosphere.
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Affiliation(s)
- Priyanka Gupta
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin, New Zealand
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15
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Takahashi K, Plath KL, Axson JL, Nelson GC, Skodje RT, Vaida V. Dynamics and spectroscopy of vibrational overtone excited glyoxylic acid and 2,2-dihydroxyacetic acid in the gas-phase. J Chem Phys 2010; 132:094305. [DOI: 10.1063/1.3327839] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Havey DK, Du J, Liu Q, Mullin AS. Full State-Resolved Energy Gain Profiles of CO2 (J = 2−80) from Collisions of Highly Vibrationally Excited Molecules. 1. Relaxation of Pyrazine (E = 37900 cm−1). J Phys Chem A 2009; 114:1569-80. [DOI: 10.1021/jp908934j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daniel K. Havey
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Juan Du
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Qingnan Liu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
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17
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RONG ZIMEI, KJAERGAARD HENRIKG, SAGE MARTINL. Comparison of the Morse and Deng-Fan potentials for X-H bonds in small molecules. Mol Phys 2009. [DOI: 10.1080/0026897031000137706] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- ZIMEI RONG
- a Department of Chemistry , University of Otago , PO Box 56, Dunedin , New Zealand
| | - HENRIK G. KJAERGAARD
- a Department of Chemistry , University of Otago , PO Box 56, Dunedin , New Zealand
| | - MARTIN L. SAGE
- b Department of Chemistry , Syracuse University , Syracuse , New York , 13244 , USA
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18
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Plath KL, Takahashi K, Skodje RT, Vaida V. Fundamental and overtone vibrational spectra of gas-phase pyruvic acid. J Phys Chem A 2009; 113:7294-303. [PMID: 19260671 DOI: 10.1021/jp810687t] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pyruvic acid (CH(3)COCOOH) is an important keto acid present in the atmosphere. In this study, the vibrational spectroscopy of gas-phase pyruvic acid has been investigated with special emphasis on the overtone transitions of the OH-stretch, with Delta v(OH) = 2, 4, 5. Assignments were made to fundamental and combination bands in the mid-IR. The two lowest energy rotational conformers of pyruvic acid are clearly observed in the spectrum. The lowest energy conformer possesses an intramolecular hydrogen bond, while the next lowest rotational conformer does not. This difference is clearly seen in the spectra of the OH vibrational overtone transitions, and it is reflected in the anharmonicities of the OH-stretching modes for each conformer. The spectra of the OH-stretching vibration for both conformers were investigated to establish the effect of the hydrogen bond on frequency, intensity, and line width.
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Affiliation(s)
- Kathryn L Plath
- Department of Chemistry and Biochemistry, University of Colorado, Campus Box 215, Boulder, Colorado 80309, USA
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19
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Vaida V. Spectroscopy of Photoreactive Systems: Implications for Atmospheric Chemistry. J Phys Chem A 2008; 113:5-18. [DOI: 10.1021/jp806365r] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Veronica Vaida
- Department of Chemistry, University of Colorado, Boulder, Colorado 80309
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20
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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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Stark H, Brown SS, Burkholder JB, Aldener M, Riffault V, Gierczak T, Ravishankara AR. Overtone Dissociation of Peroxynitric Acid (HO2NO2): Absorption Cross Sections and Photolysis Products. J Phys Chem A 2008; 112:9296-303. [DOI: 10.1021/jp802259z] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Harald Stark
- NOAA, Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305
| | - Steven S. Brown
- NOAA, Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305
| | - James B. Burkholder
- NOAA, Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305
| | - Mattias Aldener
- NOAA, Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305
| | - Veronique Riffault
- NOAA, Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305
| | - Tomasz Gierczak
- NOAA, Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305
| | - A. R. Ravishankara
- NOAA, Earth System Research Laboratory, 325 Broadway, Boulder, Colorado 80305
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Matthews J, Fry JL, Roehl CM, Wennberg PO, Sinha A. Vibrational overtone initiated unimolecular dissociation of HOCH2OOH and HOCD2OOH: Evidence for mode selective behavior. J Chem Phys 2008; 128:184306. [DOI: 10.1063/1.2912063] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Lane JR, Kjaergaard HG. Calculated Electronic Transitions in Sulfuric Acid and Implications for Its Photodissociation in the Atmosphere. J Phys Chem A 2008; 112:4958-64. [DOI: 10.1021/jp710863r] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Joseph R. Lane
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand, and The Lundbeck Foundation Center for Theoretical Chemistry, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Henrik G. Kjaergaard
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand, and The Lundbeck Foundation Center for Theoretical Chemistry, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
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24
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Fiore AM, West JJ, Horowitz LW, Naik V, Schwarzkopf MD. Characterizing the tropospheric ozone response to methane emission controls and the benefits to climate and air quality. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd009162] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Tian Y, He TJ, He L, Liu FC, Chen DM. Theoretical Study on Mechanism of Reaction of OH with HO2NO2. CHINESE J CHEM PHYS 2008. [DOI: 10.1088/1674-0068/21/01/32-38] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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26
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Havey DK, Liu Q, Li Z, Elioff M, Mullin AS. Collisions of Highly Vibrationally Excited Pyrazine (Evib = 37 900 cm-1) with HOD: State-Resolved Probing of Strong and Weak Collisions. J Phys Chem A 2007; 111:13321-9. [DOI: 10.1021/jp076023i] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel K. Havey
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry and Biochemistry, Boston University, Boston, Massachusetts 02215
| | - Qingnan Liu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry and Biochemistry, Boston University, Boston, Massachusetts 02215
| | - Ziman Li
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry and Biochemistry, Boston University, Boston, Massachusetts 02215
| | - Michael Elioff
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry and Biochemistry, Boston University, Boston, Massachusetts 02215
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry and Biochemistry, Boston University, Boston, Massachusetts 02215
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Young CJ, Donaldson DJ. Overtone-Induced Degradation of Perfluorinated Alcohols in the Atmosphere. J Phys Chem A 2007; 111:13466-71. [DOI: 10.1021/jp075607h] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Cora J. Young
- Department of Chemistry, University of Toronto, 80 St George Street, Toronto, ON, Canada M5S 3H6
| | - D. J. Donaldson
- Department of Chemistry, University of Toronto, 80 St George Street, Toronto, ON, Canada M5S 3H6
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29
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Flowers BA, Stanton JF, Simpson WR. Wavelength Dependence of Nitrate Radical Quantum Yield from Peroxyacetyl Nitrate Photolysis: Experimental and Theoretical Studies. J Phys Chem A 2007; 111:11602-7. [DOI: 10.1021/jp0749118] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Bradley A. Flowers
- Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712
| | - John F. Stanton
- Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712
| | - William R. Simpson
- Department of Chemistry and Geophysical Institute, University of Alaska, Fairbanks, Fairbanks, Alaska 99775-6160
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Lane JR, Kjaergaard HG. Fluorosulfonic Acid and Chlorosulfonic Acid: Possible Candidates for OH-Stretching Overtone-Induced Photodissociation. J Phys Chem A 2007; 111:9707-13. [PMID: 17764162 DOI: 10.1021/jp074436d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have calculated the stationary points and internal reaction coordinate pathway for the dissociation of fluorosulfonic acid (FSO3H) and chlorosulfonic acid (ClSO3H). These sulfonic acids dissociate to sulfur trioxide and hydrogen fluoride and chloride, respectively. We have calculated the frequencies and intensities of the OH-stretching transitions of FSO3H and ClSO3H with an anharmonic oscillator local mode model. We find that excitation of the fourth and third OH-stretching overtones provide adequate energy for photodissociation of FSO3H and ClSO3H, respectively. We propose that experimental detection of the products of OH-stretching overtone-induced photodissociation of FSO3H and ClSO3H would be easier than the sulfuric acid (H2SO4) equivalent. The photodissociation of H2SO4 is thought to be important in the stratosphere. The FSO3H and ClSO3H experiment could be used in proxy to support the recently proposed OH-stretching overtone-induced photodissociation mechanism of H2SO4.
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Affiliation(s)
- Joseph R Lane
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
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31
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Ishiuchi SI, Fujii M, Robinson TW, Miller BJ, Kjaergaard HG. Vibrational overtone spectroscopy of phenol and its deuterated isotopomers. J Phys Chem A 2007; 110:7345-54. [PMID: 16759122 DOI: 10.1021/jp060723q] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have measured the OH- and OD-stretching fundamental and overtone spectra of phenol and its deuterated isotopomers under jet-cooled conditions using nonresonant ionization detection spectroscopy and vapor-phase infrared (IR) and near-infrared (NIR) spectra at room temperature using conventional and photoacoustic spectroscopy. The OH- and OD-stretching bands in the jet-cooled spectra are about 1-10 cm(-1) wide and generally show a few Lorentzian shaped peaks. The bands in the room-temperature spectra have widths of 20-30 cm(-1) and display clear rotational profiles. The band profiles in the jet-cooled spectra arise mostly from nonstatistical intramolecular vibrational redistribution (IVR) with specific coupling to "doorway" states, which are likely to involve CH- and CD-stretching vibrations. The transition dipole moment that determines the rotational structure is found to rotate significantly from the fundamental to the third overtone and is not directed along the OH(D) bond. We use these calculated transition dipole moments to simulate the rotational structure. We determine the rotational temperature in the jet-cooled spectra to be about 0.5 K. Anharmonic oscillator local mode calculations of frequencies and intensities of the OH- and OD-stretching transitions are compared with our measured results. The calculated intensities are in good agreement with the absolute intensities obtained from conventional spectroscopy and with the relative intensities obtained from the room-temperature laser spectroscopy.
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Affiliation(s)
- Shun-ichi Ishiuchi
- Chemical Resources Laboratory, Tokyo Institute of Technology, PRESTO/JST, Nagatsuta, Yokohama 226-8503, Japan
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32
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Stiller GP, von Clarmann T, Brühl C, Fischer H, Funke B, Glatthor N, Grabowski U, Höpfner M, Jöckel P, Kellmann S, Kiefer M, Linden A, López-Puertas M, Mengistu Tsidu G, Milz M, Steck T, Steil B. Global distributions of HO2NO2as observed by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS). ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007212] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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33
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Kim S, Huey LG, Stickel RE, Tanner DJ, Crawford JH, Olson JR, Chen G, Brune WH, Ren X, Lesher R, Wooldridge PJ, Bertram TH, Perring A, Cohen RC, Lefer BL, Shetter RE, Avery M, Diskin G, Sokolik I. Measurement of HO2NO2in the free troposphere during the Intercontinental Chemical Transport Experiment–North America 2004. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007676] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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34
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35
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Olson JR, Crawford JH, Chen G, Brune WH, Faloona IC, Tan D, Harder H, Martinez M. A reevaluation of airborne HOxobservations from NASA field campaigns. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jd006617] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jennifer R. Olson
- Atmospheric Sciences Division, Langley Research Center; NASA; Hampton Virginia USA
| | - James H. Crawford
- Atmospheric Sciences Division, Langley Research Center; NASA; Hampton Virginia USA
| | - Gao Chen
- Atmospheric Sciences Division, Langley Research Center; NASA; Hampton Virginia USA
| | - William H. Brune
- Department of Meteorology; Pennsylvania State University; University Park Pennsylvania USA
| | - Ian C. Faloona
- Department of Land, Air and Water Resources; University of California; Davis California USA
| | - David Tan
- School of Earth and Atmospheric Sciences; Georgia Institute of Technology; Atlanta Georgia USA
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36
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Fry JL, Matthews J, Lane JR, Roehl CM, Sinha A, Kjaergaard HG, Wennberg PO. OH-Stretch Vibrational Spectroscopy of Hydroxymethyl Hydroperoxide. J Phys Chem A 2006; 110:7072-9. [PMID: 16737255 DOI: 10.1021/jp0612127] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report measurement and analysis of the photodissociation spectrum of hydroxymethyl hydroperoxide (HOCH(2)OOH) and its partially deuterated analogue, HOCD(2)OOH, in the OH-stretching region. Spectra are obtained by Fourier transform infrared spectroscopy in the 1nu(OH) and 2nu(OH) regions, and by laser induced fluorescence detection of the OH fragment produced from dissociation of HOCH(2)OOH initiated by excitation of the 4nu(OH) and 5nu(OH) overtone regions (action spectroscopy). A one-dimensional local-mode model of each OH chromophore is used with ab initio calculated OH-stretching potential energy and dipole moment curves at the coupled-cluster level of theory. Major features in the observed absorption and photodissociation spectra are explained by our local-mode model. In the 4nu(OH) region, explanation of the photodissocation spectrum requires a nonuniform quantum yield, which is estimated by assuming statistical energy distribution in the excited state. Based on the estimated dissociation threshold, overtone photodissociation is not expected to significantly influence the atmospheric lifetime of hydroxymethyl hydroperoxide.
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Affiliation(s)
- Juliane L Fry
- Arthur Amos Laboratory of Chemical Physics, California Institute of Technology, Pasadena, 91125, USA
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37
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Havey DK, Feierabend KJ, Takahashi K, Skodje RT, Vaida V. Experimental and Theoretical Investigation of Vibrational Overtones of Glycolic Acid and Its Hydrogen Bonding Interactions with Water. J Phys Chem A 2006; 110:6439-46. [PMID: 16706399 DOI: 10.1021/jp060602q] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The present work reports observations of the 4nu(1) and 4nu(2) O-H stretching transitions in glycolic acid, CH(2)OHCOOH, using a highly sensitive cavity ring-down spectrometer. Experimental and theoretical values for the harmonic frequencies and anharmonic constants of both O-H stretching transitions were extracted and are compared with theoretical calculations in the literature. Calculations of anharmonic frequencies, intensities, and relative energies have been performed and are presented for three conformers of glycolic acid. In the presence of water, an interesting broad spectral feature appeared underneath 4nu(1) and 4nu(2). New calculations for harmonic frequencies, intensities, and relative energies of four CH(2)OHCOOH-H(2)O complexes are reported to aid in understanding the observed spectrum. This work suggests that the perturbations are caused by intermolecular hydrogen bonding of glycolic acid with one or more water molecules.
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Affiliation(s)
- Daniel K Havey
- Department of Chemistry and Biochemistry and CIRES, University of Colorado, Campus Box 215, Boulder, Colorado 80309, USA
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38
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Haynes LM, Vogelhuber KM, Pippen JL, Hsieh S. Effects of torsion on O–H stretch overtone spectra and direct overtone photolysis of methyl hydroperoxide. J Chem Phys 2005; 123:234306. [PMID: 16392919 DOI: 10.1063/1.2139673] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We use laser photoacoustic spectroscopy to obtain overtone spectra at three through six quanta of O-H stretch excitation (3nu(OH)-6nu(OH)) for methyl hydroperoxide (MeOOH). Extending the spectral regions beyond our previous work reveals new features that can be attributed to transitions involving torsion about the O-O bond. Experimental spectral profiles (3nu(OH)-6nu(OH)) and cross sections (3nu(OH)-5nu(OH)) at room temperature show a good agreement with the simulated spectra that we obtain from ab initio calculations employing a vibration-torsion model at 298 K. A Birge-Sponer analysis yields experimental values for the O-H stretch frequency (omega=3773+/-15 cm(-1)) and anharmonicity (omegax=94+/-3 cm(-1)). We also detect OH radicals by laser-induced fluorescence and present photodissociation action spectra of MeOOH in the regions of 4nu(OH) and 5nu(OH). While the spectral profile at 5nu(OH) mimics the photoacoustic spectrum, the peak intensity for transitions to torsionally excited states is relatively more intense in the action spectrum at 4nu(OH), reflecting the fact that the 4nu(OH) excitation energy is below the literature dissociation energy (D0=42.6+/-1 kcal mol(-1)) so that features in the action spectrum come from thermally populated excited states. Finally, we use our calculations to assign contributions to individual peaks in the room-temperature spectra and relate our findings to a recent dynamics study in the literature.
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Affiliation(s)
- Laura M Haynes
- Chemistry Department, Smith College, Clark Science Center, Northampton, Massachusetts 01063, USA
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39
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Schofield DP, Kjaergaard HG, Matthews J, Sinha A. The OH-stretching and OOH-bending overtone spectrum of HOONO. J Chem Phys 2005; 123:134318. [PMID: 16223299 DOI: 10.1063/1.2047574] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have simulated the HOONO vibrational overtone spectrum with use of a local mode Hamiltonian that includes the OH-stretching, OOH-bending, and NOOH-torsional modes and coupling between all three modes. The local mode parameters and the dipole moment function are calculated with coupled-cluster ab initio theory and an augmented Dunning-type triple-zeta basis set. We investigate the accuracy of the local mode parameters obtained from two different potential-energy fitting routines, as well as the sensitivity of these parameters to the basis set employed. We compare our simulated spectra to previously published action spectra in the first and second OH-stretching overtone regions. In addition we have recorded the spectrum in the OH-stretch and OOH-bend combination region around 7700 cm-1 and we also compare to this. Our simulated spectrum is in qualitative agreement with experiment in the first and second OH-stretching overtone and in the stretch-bend regions.
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Affiliation(s)
- Daniel P Schofield
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin, New Zealand
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40
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Theoretical study of anharmonic vibrational spectra of HNO3, HNO3–H2O, HNO4: Fundamental, overtone and combination excitations. Chem Phys 2005. [DOI: 10.1016/j.chemphys.2005.01.012] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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41
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Matthews J, Sinha A, Francisco JS. The importance of weak absorption features in promoting tropospheric radical production. Proc Natl Acad Sci U S A 2005; 102:7449-52. [PMID: 15890778 PMCID: PMC1103708 DOI: 10.1073/pnas.0502687102] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2005] [Indexed: 11/18/2022] Open
Abstract
Atmospheric field measurement and modeling studies have long noted discrepancies between observation and predictions of OH and HO(2) concentrations in the atmosphere. Novel photochemical mechanisms have been proposed to explain these differences. Although inclusion of these additional sources improves agreement, they are unable to fully account for the observations. We report and demonstrate the importance of weak electronic absorption features, normally ignored or not measured, in contributing to significant OH radical production. Experiments on methyl hydroperoxide, a prototypical organic peroxide in large abundance in the troposphere, highlights how photochemistry in the neglected electronic absorption tail makes an important addition to the tropospheric OH budget. The present results underscore the need to measure absorption cross sections for atmospheric molecules over a wider dynamic range, especially over the wavelength regions where the solar flux is high, to fully quantitate their contributions to atmospheric photochemistry.
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Affiliation(s)
- Jamie Matthews
- Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, CA 93093-0314, USA
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42
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Staikova M, Oh M, Donaldson DJ. Overtone-Induced Decarboxylation: A Potential Sink for Atmospheric Diacids. J Phys Chem A 2005; 109:597-602. [PMID: 16833384 DOI: 10.1021/jp046141v] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Atmospheric photochemistry induced by solar excitation of vibrational overtone transitions has recently been demonstrated to be of importance in cleaving weak bonds (in HO(2)NO(2)) and inducing intramolecular rearrangement followed by reaction (in H(2)SO(4)). Here, we propose another potentially important process: the decarboxylation of organic acids. To demonstrate this possibility, we have calculated the decarboxylation pathways for malonic acid and its monohydrate. The barrier to the gas-phase decarboxylation was calculated to be in the range 26-28 kcal/mol at the B3LYP/6-311++G(3df,3pd) level of theory, in good agreement with previous results. The transition state is a six-membered ring structure which is accessed via concerted O-H and C-C stretches; excitation of v(OH) > or = 3 of either one of the OH stretching modes is sufficient to supply the energy needed for the decarboxylation. A low-energy isomer of the malonic acid-water complex forms an eight-membered, multiply hydrogen bonded structure, bound by 3-6 kcal/mol, somewhat less stable than the lowest energy, six-membered ring isomer. Decarboxylation of such complexes uses water as a catalyst; the water accepts an acidic proton from one malonic acid group and transfers a proton to the carbonyl of the other acid group. The barrier for this process is 20-22 kcal/mol, suggesting that complexes excited to v(OH) > or = 2 possess sufficient energy to react. Using estimated absorption cross sections for the OH overtone transitions, we suggest that the overtone-induced decarboxylation of malonic acid and its water complex is competitive with wet deposition of the acid and with gas-phase reaction with OH for removal of the acid.
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Affiliation(s)
- M Staikova
- Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 3H6
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43
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Gierczak T, Jiménez E, Riffault V, Burkholder JB, Ravishankara AR. Thermal Decomposition of HO2NO2 (Peroxynitric Acid, PNA): Rate Coefficient and Determination of the Enthalpy of Formation. J Phys Chem A 2005; 109:586-96. [PMID: 16833383 DOI: 10.1021/jp046632f] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Rate coefficients for the gas-phase thermal decomposition of HO(2)NO(2) (peroxynitric acid, PNA) are reported at temperatures between 331 and 350 K at total pressures of 25 and 50 Torr of N(2). Rate coefficients were determined by measuring the steady-state OH concentration in a mixture of known concentrations of HO(2)NO(2) and NO. The measured thermal decomposition rate coefficients k(-)(1)(T,P) are used in combination with previously published rate coefficient data for the HO(2)NO(2) formation reaction to yield a standard enthalpy for reaction 1 of Delta(r)H degrees (298K) = -24.0 +/- 0.5 kcal mol(-1) (uncertainties are 2sigma values and include estimated systematic errors). A HO(2)NO(2) standard heat of formation, Delta(f)H degrees (298K)(HO(2)NO(2)), of -12.6 +/- 1.0 kcal mol(-1) was calculated from this value. Some of the previously reported data on the thermal decomposition of HO(2)NO(2) have been reanalyzed and shown to be in good agreement with our reported value.
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Affiliation(s)
- Tomasz Gierczak
- Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado 80305-3328, USA
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44
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Li Q. North American pollution outflow and the trapping of convectively lifted pollution by upper-level anticyclone. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jd005039] [Citation(s) in RCA: 142] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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45
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Ricaud P. Polar vortex evolution during the 2002 Antarctic major warming as observed by the Odin satellite. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jd005018] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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46
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Jiménez E, Gierczak T, Stark H, Burkholder JB, Ravishankara AR. Quantum yields of OH, HO2and NO3in the UV photolysis of HO2NO2. Phys Chem Chem Phys 2005; 7:342-8. [DOI: 10.1039/b413429j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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47
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Homitsky SC, Dragulin SM, Haynes LM, Hsieh S. O−H Stretch Overtone Excitation in Methyl and Ethyl Hydroperoxides. J Phys Chem A 2004. [DOI: 10.1021/jp047455l] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sarah C. Homitsky
- Chemistry Department, Smith College, Clark Science Center, Northampton, Massachusetts 01063
| | - Sonia M. Dragulin
- Chemistry Department, Smith College, Clark Science Center, Northampton, Massachusetts 01063
| | - Laura M. Haynes
- Chemistry Department, Smith College, Clark Science Center, Northampton, Massachusetts 01063
| | - Shizuka Hsieh
- Chemistry Department, Smith College, Clark Science Center, Northampton, Massachusetts 01063
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48
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Matthews J, Sinha A, Francisco JS. High level ab initio study of the structure and vibrational spectra of HO2NO2. J Chem Phys 2004; 121:5720-7. [PMID: 15366995 DOI: 10.1063/1.1783131] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A high-level ab initio study has been performed on the conformational structure and vibrational spectra of HO(2)NO(2). Calculations carried out with coupled-cluster methods using a series of Pople and Dunning basis sets reveal that there is a significant basis set dependence on the predicted ab initio structure. Higher angular momentum basis sets are shown to be necessary in order to bring the calculated structure into agreement with experimental rotational constants. Harmonic vibrational frequencies of HO(2)NO(2) are computed at the CCSD(T)/aug-cc-pVTZ level of theory while the corresponding vibrational anharmonicities are calculated at the MP2/cc-pVTZ level. In addition, the absorption cross sections of OH stretching overtones in HO(2)NO(2) are calculated using a dipole function computed at the QCISD level of theory and found to be in good agreement with the available experimental data.
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Affiliation(s)
- Jamie Matthews
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0314, USA
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49
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Matthews J, Sharma R, Sinha A. Photodissociation of Vibrationally Excited Pernitric Acid: HO2NO2 (2ν1) + 390 nm. J Phys Chem A 2004. [DOI: 10.1021/jp040285s] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jamie Matthews
- Department of Chemistry and Biochemistry, University of California−San Diego, 9500 Gilman Drive, La Jolla, California 92093-0314
| | - Ramesh Sharma
- Department of Chemistry and Biochemistry, University of California−San Diego, 9500 Gilman Drive, La Jolla, California 92093-0314
| | - Amitabha Sinha
- Department of Chemistry and Biochemistry, University of California−San Diego, 9500 Gilman Drive, La Jolla, California 92093-0314
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50
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Matthews J, Sinha A, Francisco JS. Relative vibrational overtone intensity of cis–cis and trans–perp peroxynitrous acid. J Chem Phys 2004; 120:10543-53. [PMID: 15268081 DOI: 10.1063/1.1738105] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The vibrational overtone spectrum of HOONO is examined in the region of the 2 nu(OH) and 3 nu(OH) bands using action spectroscopy in conjunction with ab initio intensity calculations. The present measurements indicate that the oscillator strength associated with the higher energy trans-perp conformer of HOONO is stronger relative to the lower energy cis-cis conformer for both these vibrational overtone levels. Ab initio intensity calculations carried out at the QCISD level of theory suggest that this disparity in oscillator strength apparently arises from differences in the second derivative of the transition dipole moment function of the two isomers. The calculations indicate that the oscillator strength for the trans-perp isomer is approximately 5.4 times larger than that of the cis-cis isomer for the 2 nu(OH) band and approximately 2 times larger for 3 nu(OH) band. The band positions and intensities predicted by the calculations are used to aid in the assignment of features in the experimental action spectra associated with the OH stretching overtones of HOONO. The observed relative intensities in the experimental action spectra when normalized to the calculated oscillator strengths appears to suggest that the concentration of the higher energy trans-perp isomer is comparable to the concentration of the cis-cis isomer in these room temperature experiments.
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Affiliation(s)
- Jamie Matthews
- Department of Chemistry and Biochemistry, University of California-San Diego, La Jolla, California 92093-0314, USA
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