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Hata H, Tonokura K. Kinetic study of isoprene hydroxy hydroperoxide radicals reacting with sulphur dioxide and their global-scale impact on sulphate formation. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2024; 26:1147-1155. [PMID: 38856669 DOI: 10.1039/d4em00232f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
Isoprene is the most relevant volatile organic compound emitted during the biosynthesis of metabolism processes. The oxidation of isoprene by a hydroxy radical (OH) is one of the main consumption schemes that generate six isomers of isoprene hydroxy hydroperoxide radicals (ISOPOOs). In this study, the rate constants of ISOPOOs + sulphur dioxide (SO2) reactions that eventually generate sulphur trioxide (SO3), the precursor of sulphate aerosol (SO42-(p)), are determined using microcanonical kinetic theories coupled with molecular structures and energies estimated by quantum chemical calculations. The results show that the reaction rates range from 10-27 to 10-20 cm3 molecule-1 s-1, depending on the atmospheric temperature and structure of the six ISOPOO isomers. The effect of SO3 formation from SO2 oxidation by ISOPOOs on the atmosphere is evaluated by a global chemical transport model, along with the rate constants obtained from microcanonical kinetic theories. The results show that SO3 formation is enhanced in regions with high SO2 or low nitrogen oxide (NO), such as China, the Middle East, and Amazon rainforests. However, the production rates of SO3 formation by ISOPOOs + SO2 reactions are eight orders of magnitude lower than that from the OH + SO2 reaction. This is indicative of SO42-(p) formation from the direct oxidation of SO2 by ISOPOOs, which is almost negligible in the atmosphere. The results of this study entail a detailed analysis of SO3 formation from gas-phase reactions of isoprene-derived products.
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Affiliation(s)
- Hiroo Hata
- Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan.
| | - Kenichi Tonokura
- Department of Environment Systems, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwano-ha, Kashiwa, Chiba 277-8563, Japan
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Wang C, Liu Y, Huang T, Feng Y, Wang Z, Lu R, Jiang S. Sulfuric acid-dimethylamine particle formation enhanced by functional organic acids: an integrated experimental and theoretical study. Phys Chem Chem Phys 2022; 24:23540-23550. [PMID: 36129069 DOI: 10.1039/d2cp01671k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Atmospheric new particle formation (NPF), which has been observed globally in clean and polluted environments, is an important source of boundary-layer aerosol particles and cloud condensation nuclei, but the fundamental mechanisms leading to multi-component aerosol formation have not been well understood. Here, we use experiments and quantum chemical calculations to better understand the involvement of carboxylic acids in initial NPF from gas phase mixtures of carboxylic acid, sulfuric acid (SA), dimethylamine, and water. A turbulent flow tube coupled to an ultrafine condensation particle counter with particle size magnifier has been set up to measure NPF. Experimental results show that pyruvic acid (PA), succinic acid (SUA), and malic acid (MA) can enhance sulfuric acid-dimethylamine nucleation in the order PA < SUA < MA with a greater enhancement observed at lower SA concentrations. Computational results indicate that the carboxylic and hydroxyl groups are related to the enhancement. This experiment-theory study shows the formation of multi-component aerosol particles and the role of the organic functional group, which may aid in understanding the role of organics in aerosol nucleation and growth in polluted areas, and help to choose organic molecules of specific structures for simulation.
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Affiliation(s)
- Chunyu Wang
- School of Information Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China. .,School of Chemistry and Material Engineering, Chaohu University, Hefei, Anhui, 238024, China
| | - Yirong Liu
- School of Information Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
| | - Teng Huang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui, 230031, China
| | - Yajuan Feng
- School of Information Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
| | - Zhongquan Wang
- Department of Physics, Huainan Normal University, Huainan, Anhui, 232001, China
| | - Runqi Lu
- School of Information Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
| | - Shuai Jiang
- School of Information Science and Technology, University of Science and Technology of China, Hefei, Anhui, 230026, China.
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3
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Peng Z, Jimenez JL. Radical chemistry in oxidation flow reactors for atmospheric chemistry research. Chem Soc Rev 2020; 49:2570-2616. [DOI: 10.1039/c9cs00766k] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
We summarize the studies on the chemistry in oxidation flow reactor and discuss its atmospheric relevance.
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Affiliation(s)
- Zhe Peng
- Cooperative Institute for Research in Environmental Sciences and Department of Chemistry
- University of Colorado
- Boulder
- USA
| | - Jose L. Jimenez
- Cooperative Institute for Research in Environmental Sciences and Department of Chemistry
- University of Colorado
- Boulder
- USA
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Almatarneh MH, Elayan IA, Abu‐Saleh AAA, Altarawneh M, Ariya PA. The gas‐phase ozonolysis reaction of methylbutenol: A mechanistic study. INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY 2019; 119:e25888. [DOI: 10.1002/qua.25888] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Affiliation(s)
- Mansour H. Almatarneh
- Department of ChemistryUniversity of Jordan Amman Jordan
- Department of ChemistryMemorial University St. John's NL Canada
| | | | | | - Mohammednoor Altarawneh
- School of Engineering and Information TechnologyMurdoch University Perth Australia
- Chemical Engineering DepartmentAl‐Hussein Bin Talal University Ma'an Jordan
| | - Parisa A. Ariya
- Department of ChemistryMcGill University Montreal Canada
- Department of Atmospheric and Oceanic SciencesMcGill University Montreal Canada
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Wennberg PO, Bates KH, Crounse JD, Dodson LG, McVay RC, Mertens LA, Nguyen TB, Praske E, Schwantes RH, Smarte MD, St Clair JM, Teng AP, Zhang X, Seinfeld JH. Gas-Phase Reactions of Isoprene and Its Major Oxidation Products. Chem Rev 2018. [PMID: 29522327 DOI: 10.1021/acs.chemrev.7b00439] [Citation(s) in RCA: 145] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Isoprene carries approximately half of the flux of non-methane volatile organic carbon emitted to the atmosphere by the biosphere. Accurate representation of its oxidation rate and products is essential for quantifying its influence on the abundance of the hydroxyl radical (OH), nitrogen oxide free radicals (NO x), ozone (O3), and, via the formation of highly oxygenated compounds, aerosol. We present a review of recent laboratory and theoretical studies of the oxidation pathways of isoprene initiated by addition of OH, O3, the nitrate radical (NO3), and the chlorine atom. From this review, a recommendation for a nearly complete gas-phase oxidation mechanism of isoprene and its major products is developed. The mechanism is compiled with the aims of providing an accurate representation of the flow of carbon while allowing quantification of the impact of isoprene emissions on HO x and NO x free radical concentrations and of the yields of products known to be involved in condensed-phase processes. Finally, a simplified (reduced) mechanism is developed for use in chemical transport models that retains the essential chemistry required to accurately simulate isoprene oxidation under conditions where it occurs in the atmosphere-above forested regions remote from large NO x emissions.
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Elucidating the fate of the OH-adduct in toluene oxidation under tropospheric boundary layer conditions. Proc Natl Acad Sci U S A 2017; 114:E7856-E7857. [PMID: 28882986 DOI: 10.1073/pnas.1713678114] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Abstract
Photochemical oxidation of aromatic hydrocarbons leads to tropospheric ozone and secondary organic aerosol (SOA) formation, with profound implications for air quality, human health, and climate. Toluene is the most abundant aromatic compound under urban environments, but its detailed chemical oxidation mechanism remains uncertain. From combined laboratory experiments and quantum chemical calculations, we show a toluene oxidation mechanism that is different from the one adopted in current atmospheric models. Our experimental work indicates a larger-than-expected branching ratio for cresols, but a negligible formation of ring-opening products (e.g., methylglyoxal). Quantum chemical calculations also demonstrate that cresols are much more stable than their corresponding peroxy radicals, and, for the most favorable OH (ortho) addition, the pathway of H extraction by O2 to form the cresol proceeds with a smaller barrier than O2 addition to form the peroxy radical. Our results reveal that phenolic (rather than peroxy radical) formation represents the dominant pathway for toluene oxidation, highlighting the necessity to reassess its role in ozone and SOA formation in the atmosphere.
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Dibble TS, Sha Y, Thornton WF, Zhang F. Cis–Trans Isomerization of Chemically Activated 1-Methylallyl Radical and Fate of the Resulting 2-Buten-1-peroxy Radical. J Phys Chem A 2012; 116:7603-14. [DOI: 10.1021/jp303652x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Theodore S. Dibble
- Department of Chemistry, State University of New York—Environmental Science and Forestry, Syracuse, New York 13210, United States
| | - Yuan Sha
- Department of Chemistry, State University of New York—Environmental Science and Forestry, Syracuse, New York 13210, United States
| | - William F. Thornton
- Department of Chemistry, State University of New York—Environmental Science and Forestry, Syracuse, New York 13210, United States
| | - Feng Zhang
- Department of Chemistry, State University of New York—Environmental Science and Forestry, Syracuse, New York 13210, United States
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Zhang R, Khalizov A, Wang L, Hu M, Xu W. Nucleation and growth of nanoparticles in the atmosphere. Chem Rev 2011; 112:1957-2011. [PMID: 22044487 DOI: 10.1021/cr2001756] [Citation(s) in RCA: 471] [Impact Index Per Article: 36.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Renyi Zhang
- Department of Atmospheric Sciences and Department of Chemistry, Center for Atmospheric Chemistry and Environment, Texas A&M University, College Station, Texas 77843, USA.
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Ghosh B, Bugarin A, Connell BT, North SW. Isomer-selective study of the OH-initiated oxidation of isoprene in the presence of O(2) and NO: 2. the major OH addition channel. J Phys Chem A 2010; 114:2553-60. [PMID: 20121059 DOI: 10.1021/jp909052t] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the first isomeric-selective study of the dominant isomeric pathway in the OH-initiated oxidation of isoprene in the presence of O2 and NO using the laser photolysis-laser induced fluorescence (LP-LIF) technique. The photolysis of monodeuterated/nondeuterated 2-iodo-2-methylbut-3-en-1-ol results exclusively in the dominant OH-isoprene addition product, providing important insight into the oxidation mechanism. On the basis of kinetic analysis of OH cycling experiments, we have determined the rate constant for O2 addition to the hydroxyalkyl radical to be 1.0(-0.5)+1.7 x 10(-12) cm3 s(-1), and we find a value of 8.1-2.3+3.4 x 10(-12) cm3 s(-1) for the overall reaction rate constant of the resulting hydroxyperoxy radical with NO. We also report the first clear experimental evidence of the (E) form of the delta-hydroxyalkoxy channel through isotopic labeling experiments and quantify its branching ratio to be (10 +/- 3)%. This puts a rigorous upper limit on the branching of the (E)-delta-hydroxyalkoxy radical channel. Since our measured isomeric-selective rate constants for the dominant outer channel in OH-initiated isoprene chemistry are similar to the overall rate constants derived from nonisomeric kinetics, we predict that the remaining outer addition channel will have similar reactivity.
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Affiliation(s)
- Buddhadeb Ghosh
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, USA
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da Silva G, Graham C, Wang ZF. Unimolecular beta-hydroxyperoxy radical decomposition with OH recycling in the photochemical oxidation of isoprene. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:250-256. [PMID: 19943615 DOI: 10.1021/es900924d] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A novel process in the photochemical oxidation of isoprene that recycles hydroxyl (OH) radicals has been identified using first-principles computational chemistry. Isoprene is the dominant biogenic volatile organic compound (VOC), and its oxidation controls chemistry in the forest boundary layer and is also thought to contribute to cloud formation in marine environments. The mechanism described here involves rapid unimolecular decomposition of the two major peroxy radicals (beta-hydroxyperoxy radicals) produced by OH-initiated isoprene oxidation. Peroxy radicals are well-known as key intermediates in VOC oxidation, but up to now were only thought to be destroyed in bimolecular reactions. The process described here leads to OH recycling with up to around 60% efficiency in environments with low levels of peroxy radicals and NO(x). In forested environments reaction of the beta-hydroxyperoxy radicals with HO2 is expected to dominate, with a small contribution from the mechanism described here. Peroxy radical decomposition will be more important in the unpolluted marine boundary layer, where lower levels of NO and HO2 are encountered.
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Affiliation(s)
- Gabriel da Silva
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville 3010, Victoria, Australia.
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Greenwald EE, Ghosh B, Anderson KC, Dooley KS, Zou P, Selby T, Osborn DL, Meloni G, Taatjes CA, Goulay F, North SW. Isomer-Selective Study of the OH Initiated Oxidation of Isoprene in the Presence of O2 and NO. I. The Minor Inner OH-Addition Channel. J Phys Chem A 2009; 114:904-12. [DOI: 10.1021/jp908543a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Erin E. Greenwald
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, California 94117, and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720
| | - Buddhadeb Ghosh
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, California 94117, and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720
| | - Katie C. Anderson
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, California 94117, and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720
| | - Kristin S. Dooley
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, California 94117, and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720
| | - Peng Zou
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, California 94117, and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720
| | - Talitha Selby
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, California 94117, and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720
| | - David L. Osborn
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, California 94117, and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720
| | - Giovanni Meloni
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, California 94117, and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720
| | - Craig A. Taatjes
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, California 94117, and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720
| | - Fabien Goulay
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, California 94117, and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720
| | - Simon W. North
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, Department of Chemistry, University of San Francisco, 2130 Fulton Street, San Francisco, California 94117, and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720
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Fuchs H, Holland F, Hofzumahaus A. Measurement of tropospheric RO2 and HO2 radicals by a laser-induced fluorescence instrument. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:084104. [PMID: 19044365 DOI: 10.1063/1.2968712] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A new method (ROxLIF) for the measurement of atmospheric peroxy radicals (HO(2) and RO(2)) was developed using a two-step chemical conversion scheme and laser-induced fluorescence (LIF) for radical detection. Ambient air is sampled into a differentially pumped flow reactor, in which atmospheric RO(x) radicals (=RO(2)+RO+HO(2)+OH) are chemically converted to HO(2) by a large excess of NO and CO at reduced pressures (ROx mode). When only CO is added as a reagent, the sum of atmospheric HO(2)+OH is converted to HO(2) (HOx mode). At the reactor outlet, part of the air flow is transferred into a low-pressure detection chamber, where the HO(2) is further converted by reaction with NO to OH, which is then detected with high sensitivity by LIF at 308 nm. The ROxLIF technique has been implemented in an existing LIF instrument that is also capable of measuring atmospheric OH. From the concurrent measurements of RO(x), HO(x) and OH, concentrations of HO(2) and RO(2) can be determined. The system is calibrated using the quantitative photolysis of water vapor at 185 nm as a radical source. Addition of CO or hydrocarbons to the calibration gas yields well-defined concentrations of HO(2) or RO(2), respectively, providing an estimated accuracy for the calibration of about 20%. The ROxLIF technique is extremely sensitive and has detection limits (signal-to-noise ratio=2) of about 0.1 pptv of HO(2) or RO(2) at a time resolution of 1 min. The paper describes the technique and its calibration, discusses the chemistry in the conversion reactor and possible interferences, and gives an example of ambient air measurements to demonstrate the performance of the new technique.
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Affiliation(s)
- Hendrik Fuchs
- Forschungszentrum Julich GmbH, Institut fur Chemie und Dynamik der Geosphare 2, 52425 Julich, Germany
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Zhao J, Zhang R, Misawa K, Shibuya K. Experimental product study of the OH-initiated oxidation of m-xylene. J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2005.07.013] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Percival CJ, Shallcross DE, Canosa-Mas CE, Dyke JM. Recent advances in the application of discharge-flow to the determination of gas-phase rate coefficients at pressures and temperatures of relevance to the Earth's atmosphere. J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2005.09.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Dibble TS. Computations on the A-X transition of isoprene-OH-O2 peroxy radicals. J Comput Chem 2005; 26:836-45. [PMID: 15895385 DOI: 10.1002/jcc.20216] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Calculations are carried out on the A state of HO2, CH3O2, and CH3CH2O2 and 10 isomers and conformers of the isoprene-OH-O2 peroxy radicals derived from OH addition to isoprene (2-methyl-1,3-butadiene). In addition to calculating vertical and adiabatic excitation energies, we consider the effect of excitation on molecular structure, and examine the OO stretching frequencies, which are known to be major features in the absorption spectra of the A states of the smaller radicals. The two methods used are the configuration interaction with single excitations (CIS) method and time-dependent density functional theory (TD-DFT), both with a range of basis sets up to 6-311++G(2df,2pd). TD-DFT overestimates excitation energies considerably, while CIS tends to underestimate them slightly. TD-DFT does seem to capture the trend in excitation energy vs. size for the smaller peroxy radicals. Conformation and configuration strongly affect the excitation energies of the peroxy radicals from isoprene. CIS calculations indicate that the intramolecular OH--O hydrogen bonds, present in the ground state of some peroxy radicals from isoprene, are weakened or broken in the excited state, while TD-DFT calculations suggest they are retained.
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Affiliation(s)
- Theodore S Dibble
- Chemistry Department, State University of New York-Environmental Science and Forestry, 1 Forestry Drive, Syracuse, New York 13210, USA.
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Park J, Jongsma CG, Zhang R, North SW. OH/OD Initiated Oxidation of Isoprene in the Presence of O2 and NO. J Phys Chem A 2004. [DOI: 10.1021/jp040421t] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jiho Park
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, and Department of Atmospheric Sciences, Texas A&M University, College Station, Texas 77843
| | - Candice G. Jongsma
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, and Department of Atmospheric Sciences, Texas A&M University, College Station, Texas 77843
| | - Renyi Zhang
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, and Department of Atmospheric Sciences, Texas A&M University, College Station, Texas 77843
| | - Simon W. North
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842, and Department of Atmospheric Sciences, Texas A&M University, College Station, Texas 77843
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Zhao J, Zhang R, Fortner EC, North SW. Quantification of Hydroxycarbonyls from OH−Isoprene Reactions. J Am Chem Soc 2004; 126:2686-7. [PMID: 14995170 DOI: 10.1021/ja0386391] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hydroxycarbonyls arising from OH-initiated reactions of isoprene have been quantified by the technique of a flow reactor coupled to proton-transfer reaction mass spectrometry (PTR-MS) detection. The yields of C5- and C4-hydroxycarbonyls are (19.3 +/- 6.1)% and (3.3 +/- 1.6)%, respectively, measured at a flow tube pressure of about 100 Torr and at a temperature of 298 +/- 2 K. A yield of (8.4 +/- 2.4)% is obtained for the unsaturated carbonyl C5H8O, confirming that internal OH addition represents the minor channel in the initial OH-isoprene reaction. The results show that those carbonyl compounds account for the most previously unquantified carbon, enabling the isoprene carbon closure. The study also reveals novel aspects of the delta-hydroxyalkoxy radical degradation mechanism, which is essential for modeling tropospheric O3 formation. In addition, this work demonstrates the application of PTR-MS for quantification of products of hydrocarbon reactions, which should have profound impacts on elucidation of the chemistry of atmospheric anthropogenic and biogenic hydrocarbons.
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Affiliation(s)
- Jun Zhao
- Department of Atmospheric Sciences, Texas A&M University, College Station, Texas 77843, USA.
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