1
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Zhang Q, Hadizadeh MH, Hu Y, Zhang X, Su Z, Wu Z, Wang X, Xu F, Sun Y, Zhang Q, Wang W. The effects of the gas-liquid interface and gas phase on Cl/ClO radical interaction with water molecules. Phys Chem Chem Phys 2023; 25:23296-23305. [PMID: 37609804 DOI: 10.1039/d3cp02796a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2023]
Abstract
In the marine boundary layer (MBL), chlorine (Cl) and chlorine monoxide (ClO) are powerful oxidants with high concentrations. The gas-liquid interface is also ubiquitous in the MBL as a favorable site for atmospheric reactions. Understanding the role of water in Cl/ClO radical chemistry is essential for predicting their behavior in the atmosphere and developing effective strategies for mitigating their harmful effects. However, the research studies on the system of Cl/ClO radicals on the surface of water droplets are still insufficient. In previous studies, we have found unique results related to the hydroxyl radical at the interface using ab initio molecular dynamics (AIMD). In this work, we have used AIMD to investigate interactions between Cl/ClO radicals and water molecules at the gas-liquid interface. Radical mobility, radial distribution functions, coordination, and population analyses were conducted to investigate the surface preference, bonding pattern, and track Cl/ClO radicals in the water droplets. In addition, density functional theory (DFT) analysis was conducted to compare the results at the gas-liquid interface with those in the gas phase. We found that Cl/ClO radicals tend to remain near the gas-liquid interface in water droplet systems and outside of water clusters in gas phase systems. The ClO radical can form O*-H and Cl-O bonds with water molecules; however, neither the O*-O hemibond nor the Cl-H bond was detected in all systems. Different dominant structures were obtained for ClO in the interface and gas phase. The ClO radical can be bonded to one water molecule from its oxygen side, (H2O)0-Cl-O*-(H2O)1 at the interface, or to two water molecules from the chlorine and oxygen sides, (H2O)1-Cl-O*-(H2O)1 in the gas phase. Meanwhile, the Cl radical can only form a dominant structure like Cl*-(H2O)1 at the gas-liquid interface by making a Cl*-O hemibond. Providing a thorough explanation of the Cl/ClO radical behavior at the gas-liquid interface, this study will improve our understanding of the MBL's oxidizing capacity and pollution causes.
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Affiliation(s)
- Qi Zhang
- Environment Research Institute, Shandong University, Qingdao 266237, China.
| | - Mohammad Hassan Hadizadeh
- Environment Research Institute, Shandong University, Qingdao 266237, China.
- International Center for Quantum Design of Functional Materials (ICQD), Hefei National Laboratory for Physical Sciences at the Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Yongxia Hu
- Environment Research Institute, Shandong University, Qingdao 266237, China.
| | - Xiaoyu Zhang
- School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
| | - Zupeng Su
- School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
| | - Zihan Wu
- School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
| | - Xiaotong Wang
- Environment Research Institute, Shandong University, Qingdao 266237, China.
| | - Fei Xu
- Environment Research Institute, Shandong University, Qingdao 266237, China.
- Shenzhen Research Institute of Shandong University, Shenzhen 518057, China
| | - Yanhui Sun
- College of Environment and Safety Engineering, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Qingzhu Zhang
- Environment Research Institute, Shandong University, Qingdao 266237, China.
| | - Wenxing Wang
- Environment Research Institute, Shandong University, Qingdao 266237, China.
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2
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Theoretical Study on the Gas Phase and Gas-Liquid Interface Reaction Mechanism of Criegee Intermediates with Glycolic Acid Sulfate. Int J Mol Sci 2023; 24:ijms24043355. [PMID: 36834768 PMCID: PMC9965808 DOI: 10.3390/ijms24043355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/09/2023] [Accepted: 01/11/2023] [Indexed: 02/11/2023] Open
Abstract
Criegee intermediates (CIs) are important zwitterionic oxidants in the atmosphere, which affect the budget of OH radicals, amines, alcohols, organic/inorganic acids, etc. In this study, quantum chemical calculation and Born-Oppenheimer molecular dynamic (BOMD) simulation were performed to show the reaction mechanisms of C2 CIs with glycolic acid sulfate (GAS) at the gas-phase and gas-liquid interface, respectively. The results indicate that CIs can react with COOH and OSO3H groups of GAS and generate hydroperoxide products. Intramolecular proton transfer reactions occurred in the simulations. Moreover, GAS acts as a proton donor and participates in the hydration of CIs, during which the intramolecular proton transfer also occurs. As GAS widely exists in atmospheric particulate matter, the reaction with GAS is one of the sink pathways of CIs in areas polluted by particulate matter.
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3
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Cho J, Mulvihill CR, Klippenstein SJ, Sivaramakrishnan R. Bimolecular Peroxy Radical (RO 2) Reactions and Their Relevance in Radical Initiated Oxidation of Hydrocarbons. J Phys Chem A 2023; 127:300-315. [PMID: 36562763 DOI: 10.1021/acs.jpca.2c06960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The kinetics of peroxy radical (RO2) reactions have been of long-standing interest in atmospheric and combustion chemistry. Nevertheless, the lack of kinetic studies at higher temperatures for their reactions with other radicals such as OH has precluded the inclusion of this class of reactions in detailed kinetics models developed for combustion applications. In this work, guided by the limited room-temperature experimental studies on selected alkyl-peroxy radicals and literature theoretical kinetics on the prototypical CH3O2 + OH system, we have performed parametric studies on the effect of uncertainties in the rate coefficients and branching ratios to potential product channels for RO2 + OH reactions at higher temperatures. Literature kinetics models were used to simulate autoignition delays, laminar flame speeds, and speciation profiles in flow and stirred reactors for a variety of common combustion-relevant fuels. Inclusion of RO2 + OH reactions was found to retard autoignition in fuel-lean (φ = 0.5) mixtures of ethane and dimethyl ether in air. The observed effects were noticeably more pronounced in ozone-enriched combustion of ethane and dimethyl ether. The simulations also examined the influence of ozone doping levels, pressures, and equivalence ratios for both ethane and dimethyl ether oxidation. Sensitivity and flux analyses revealed that the RO2 + OH reaction is a significant sink of RO2 radicals at the early stage of autoignition, affecting fuel oxidation through RO2 ↔ QOOH, RO2 ↔ alkene + HO2, or RO2 + HO2 ↔ ROOH + O2. Additionally, the kinetic stability of the trioxide formed from RO2 + OH reactions was investigated using master equation analyses. Last, we discuss other bimolecular reactions that are missing in literature kinetics models but are relevant to hydrocarbon oxidation initiated by external radical sources (plasma-enhanced, ozone-enriched combustion, etc.). The present simulations provide a strong motivation for better characterizing the bimolecular kinetics of peroxy radicals.
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Affiliation(s)
- Jaeyoung Cho
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Clayton R Mulvihill
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Stephen J Klippenstein
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Raghu Sivaramakrishnan
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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4
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Assali M, Fittschen C. Self-Reaction of Acetonyl Peroxy Radicals and Their Reaction with Cl Atoms. J Phys Chem A 2022; 126:4585-4597. [PMID: 35793477 DOI: 10.1021/acs.jpca.2c02602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The rate constant for the self-reaction of the acetonyl peroxy radicals, CH3C(O)CH2O2, has been determined using laser photolysis/continuous wave cavity ring down spectroscopy (cw-CRDS). CH3C(O)CH2O2 radicals have been generated from the reaction of Cl atoms with CH3C(O)CH3, and the concentration time profiles of four radicals (HO2, CH3O2, CH3C(O)O2, and CH3C(O)CH2O2) have been determined by cw-CRDS in the near-infrared. The rate constant for the self-reaction was found to be k = (5.4 ± 1.4) × 10-12 cm3 s-1, in good agreement with a recently published value (Zuraski, K., et al. J. Phys. Chem. A 2020, 124, 8128); however, the branching ratio for the radical path was found to be ϕ1b = (0.6 ± 0.1), which is well above the recently published value (0.33 ± 0.13). The influence of a fast reaction of Cl atoms with the CH3C(O)CH2O2 radical became evident under some conditions; therefore, this reaction has been investigated in separate experiments. Through the simultaneous fitting of all four radical profiles to a complex mechanism, a very fast rate constant of k = (1.35 ± 0.8) × 10-10 cm3 s-1 was found, and experimental results could be reproduced only if Cl atoms would partially react through H-atom abstraction to form the Criegee intermediate with a branching fraction of ϕCriegee = (0.55 ± 0.1). Modeling the HO2 concentration-time profiles was possible only if a subsequent reaction of the Criegee intermediate with CH3C(O)CH3 was included in the mechanism leading to HO2 formation with a rate constant of k = (4.5 ± 2.0) × 10-14 cm3 s-1.
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Affiliation(s)
- Mohamed Assali
- Université Lille, CNRS, UMR 8522 - PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
| | - Christa Fittschen
- Université Lille, CNRS, UMR 8522 - PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
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5
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Nguyen TL, Perera A, Peeters J. High-accuracy first-principles-based rate coefficients for the reaction of OH and CH 3OOH. Phys Chem Chem Phys 2022; 24:26684-26691. [DOI: 10.1039/d2cp03919b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The ˙OH-initiated oxidation of methyl hydroperoxide was theoretically characterized using high-accuracy composite amHEAT-345(Q) coupled-cluster calculations followed by a two-dimensional E,J resolved master equation analysis.
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Affiliation(s)
- Thanh Lam Nguyen
- Quantum Theory Project, Departments of Chemistry and Physics, University of Florida, Gainesville, FL, 32611, USA
| | - Ajith Perera
- Quantum Theory Project, Departments of Chemistry and Physics, University of Florida, Gainesville, FL, 32611, USA
| | - Jozef Peeters
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
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6
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Ubiquitous atmospheric production of organic acids mediated by cloud droplets. Nature 2021; 593:233-237. [PMID: 33981052 PMCID: PMC8116209 DOI: 10.1038/s41586-021-03462-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 03/17/2021] [Indexed: 02/03/2023]
Abstract
Atmospheric acidity is increasingly determined by carbon dioxide and organic acids1-3. Among the latter, formic acid facilitates the nucleation of cloud droplets4 and contributes to the acidity of clouds and rainwater1,5. At present, chemistry-climate models greatly underestimate the atmospheric burden of formic acid, because key processes related to its sources and sinks remain poorly understood2,6-9. Here we present atmospheric chamber experiments that show that formaldehyde is efficiently converted to gaseous formic acid via a multiphase pathway that involves its hydrated form, methanediol. In warm cloud droplets, methanediol undergoes fast outgassing but slow dehydration. Using a chemistry-climate model, we estimate that the gas-phase oxidation of methanediol produces up to four times more formic acid than all other known chemical sources combined. Our findings reconcile model predictions and measurements of formic acid abundance. The additional formic acid burden increases atmospheric acidity by reducing the pH of clouds and rainwater by up to 0.3. The diol mechanism presented here probably applies to other aldehydes and may help to explain the high atmospheric levels of other organic acids that affect aerosol growth and cloud evolution.
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7
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Kumar A, Mallick S, Kumar P. Effect of water on the oxidation of CO by a Criegee intermediate. Phys Chem Chem Phys 2020; 22:21257-21266. [PMID: 32935677 DOI: 10.1039/d0cp02682d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The present work employs the CCSD(T)/CBS//M06-2X/aug-cc-pVTZ level of theory to investigate the effect of a water monomer and dimer on the oxidation of carbon-monoxide by a Criegee intermediate (CH2OO). The present work suggests that in the presence of a water monomer the energy barrier of the title reaction reduced to ∼3.4 kcal mol-1 from the corresponding uncatalyzed barrier (∼12.4 kcal mol-1), whereas, in the presence of a water dimer it became as low as ∼-3.2 kcal mol-1. It has also been found that, in the presence of catalysts, additional channels become available from which the title reaction can proceed. The estimated values of rate constants suggest that within the temperature range of 210-320 K, the effective bimolecular rate constant for the water monomer catalyzed channel is 10 to 100 times lower than the bimolecular rate constant of the uncatalyzed channel, whereas in the case of the water dimer it is ∼5-10 times higher than that of the uncatalyzed channel.
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Affiliation(s)
- Amit Kumar
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India.
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8
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MAITHANI SANCHI, PRADHAN MANIK. Cavity ring-down spectroscopy and its applications to environmental, chemical and biomedical systems. J CHEM SCI 2020. [DOI: 10.1007/s12039-020-01817-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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9
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Simultaneous determination of transient free radicals and reaction kinetics by high-resolution time-resolved dual-comb spectroscopy. Commun Chem 2020; 3:95. [PMID: 36703338 PMCID: PMC9814257 DOI: 10.1038/s42004-020-00353-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 07/10/2020] [Indexed: 01/29/2023] Open
Abstract
Quantitative determination of multiple transient species is critical in investigating reaction mechanisms and kinetics under various conditions. Dual-comb spectroscopy, a comb-laser-based multi-heterodyne interferometric technique that enables simultaneous achievement of broadband, high-resolution, and rapid spectral acquisition, opens a new era of time-resolved spectroscopic measurements. Employing an electro-optic dual-comb spectrometer with central wavelength near 3 µm coupled with a Herriott multipass absorption cell, here we demonstrate simultaneous determination of multiple species, including methanol, formaldehyde, HO2 and OH radicals, and investigate the reaction kinetics. In addition to quantitative spectral analyses of high-resolution and tens of microsecond time-resolved spectra recorded upon flash photolysis of precursor mixtures, we determine a rate coefficient of the HO2 + NO reaction by directly detecting both HO2 and OH radicals. Our approach exhibits potential in discovering reactive intermediates and exploring complex reaction mechanisms, especially those of radical-radical reactions.
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10
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Tang X, Gu X, Lin X, Zhang W, Garcia GA, Fittschen C, Loison JC, Voronova K, Sztáray B, Nahon L. Vacuum ultraviolet photodynamics of the methyl peroxy radical studied by double imaging photoelectron photoion coincidences. J Chem Phys 2020; 152:104301. [DOI: 10.1063/5.0002109] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Xiaofeng Tang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - Xuejun Gu
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - Xiaoxiao Lin
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - Weijun Zhang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
- School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin, BP 48, 91192 Gif sur Yvette, France
| | - Christa Fittschen
- University Lille, CNRS, UMR 8522, PC2A – Physicochimie des Processus de Combustion et de l’Atmosphère, F-59000 Lille, France
| | - Jean-Christophe Loison
- ISM, Université Bordeaux 1, CNRS, 351 cours de la Libération, 33405 Talence Cedex, France
| | - Krisztina Voronova
- Department of Chemistry, University of Nevada, Reno, Reno, Nevada 89557-0216, USA
| | - Bálint Sztáray
- Department of Chemistry, University of the Pacific, Stockton, California 95211, USA
| | - Laurent Nahon
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin, BP 48, 91192 Gif sur Yvette, France
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11
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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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12
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Mull HF, Aroeira GJR, Turney JM, Schaefer HF. The atmospheric importance of methylamine additions to Criegee intermediates. Phys Chem Chem Phys 2020; 22:22555-22566. [DOI: 10.1039/d0cp03781h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The methylamine addition to Criegee intermediates is investigated using high level ab initio methods.
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Affiliation(s)
- Henry F. Mull
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | | | - Justin M. Turney
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Henry F. Schaefer
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
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13
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Assali M, Rakovsky J, Votava O, Fittschen C. Experimental determination of the rate constants of the reactions of HO
2
+ DO
2
and DO
2
+ DO
2. INT J CHEM KINET 2019. [DOI: 10.1002/kin.21342] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mohamed Assali
- CNRS, UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l'AtmosphèreUniversité Lille Lille France
| | - Jozef Rakovsky
- J. Heyrovský Institute of Physical Chemistry v.v.i.Academy of Sciences of the Czech Republic Prague Czech Republic
| | - Ondrej Votava
- J. Heyrovský Institute of Physical Chemistry v.v.i.Academy of Sciences of the Czech Republic Prague Czech Republic
| | - Christa Fittschen
- CNRS, UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l'AtmosphèreUniversité Lille Lille France
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14
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Zhao Z, Tolentino R, Lee J, Vuong A, Yang X, Zhang H. Interfacial Dimerization by Organic Radical Reactions during Heterogeneous Oxidative Aging of Oxygenated Organic Aerosols. J Phys Chem A 2019; 123:10782-10792. [PMID: 31765152 DOI: 10.1021/acs.jpca.9b10779] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Oxidative aging of atmospheric organic aerosols (OA) substantially modifies their chemical compositions, physical properties, and hence the various environmental impacts. Here, we report observations of a previously unrecognized process leading to dimer formation during heterogeneous •OH-initiated oxidative aging of oxygenated OA. Isomer-resolved ion mobility mass spectrometry measurements and reaction-diffusion kinetic simulations are in good agreement, elucidating new mechanisms of dimerization by organic radical (i.e., peroxy and alkoxy radicals) cross reactions using glutaric acid as a surrogate oxygenated OA. These radical reactions are predicted to occur more prominently near the gas-particle interface following oxidation, especially in diffusion-limited viscous OA particles. Chemical structure analysis shows that esters dominate the detected dimers, followed by organic peroxides and ethers, highlighting the importance of acyl peroxy and acyloxy radicals. Simulations suggest that the reported dimer formation through the new interfacial mechanism could be appreciable under both laboratory and ambient conditions. Therefore, the dimers that are formed and enriched at the gas-particle interface are expected to play a crucial role in the effective reactivity, volatility, viscosity, and hygroscopicity of aged OA particles.
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Affiliation(s)
- Zixu Zhao
- Department of Chemistry , University of California at Riverside , Riverside , California 92521 , United States
| | - Ricardo Tolentino
- Department of Chemistry , University of California at Riverside , Riverside , California 92521 , United States
| | - Jennifer Lee
- Department of Chemistry , University of California at Riverside , Riverside , California 92521 , United States
| | - Austin Vuong
- Department of Molecular, Cell, and Systems Biology , University of California at Riverside , Riverside , California 92521 , United States
| | - Xiaoyan Yang
- Department of Environmental Sciences , University of California at Riverside , Riverside , California 92521 , United States
| | - Haofei Zhang
- Department of Chemistry , University of California at Riverside , Riverside , California 92521 , United States
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15
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Zhang F, Huang C. Pressure-Dependent Kinetics of the Reaction between CH 3OO and OH Focusing on the Product Yield of Methyltrioxide (CH 3OOOH). J Phys Chem Lett 2019; 10:3598-3603. [PMID: 31192603 DOI: 10.1021/acs.jpclett.9b00781] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The reaction kinetics of methyl peroxy radical (CH3OO) and hydroxyl radical (OH) has attracted an increasing level of interest in the past decade, while the branching yields of various product channels are still under debate. In this work, a comprehensive theoretical effort was made to investigate the branching yield of the stabilized methyltrioxide (CH3OOOH, TRIOX) adduct, which has recently been a research focus. Our computed branching ratio of TRIOX at 298 K and 760 Torr is ∼0.04, in agreement with the result of multiplexed photoionization mass spectrometry. We show that the large branching yield obtained in an early theoretical study mainly originated from the collision-induced strong stabilization presented in their simulation. Our findings clarify the controversial product yield results for this important species in recent studies. The computed rate constants over wide temperature and pressure ranges allow better integration of this reaction into global atmospheric models and low-temperature combustion kinetic models.
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Affiliation(s)
- Feng Zhang
- National Synchrotron Radiation Laboratory , University of Science and Technology of China , Hefei , Anhui 230029 , P. R. China
| | - Can Huang
- National Synchrotron Radiation Laboratory , University of Science and Technology of China , Hefei , Anhui 230029 , P. R. China
- Center for Combustion Energy and Key Laboratory for Thermal Science and Power Engineering of MOE , Tsinghua University , Beijing 100084 , P. R. China
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16
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Welch BK, Dawes R, Bross DH, Ruscic B. An Automated Thermochemistry Protocol Based on Explicitly Correlated Coupled-Cluster Theory: The Methyl and Ethyl Peroxy Families. J Phys Chem A 2019; 123:5673-5682. [DOI: 10.1021/acs.jpca.9b04381] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bradley K. Welch
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Richard Dawes
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - David H. Bross
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Branko Ruscic
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Consortium for Advanced Science and Engineering, University of Chicago, Chicago, Illinois 60637, United States
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17
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18
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Wang S, Apel EC, Hornbrook RS, Hills A, Emmons LK, Tilmes S, Lamarque JF, Jimenez JL, Campuzano-Jost P, Nault BA, Crounse JD, Wennberg PO, Ryerson TB, Thompson CR, Peischl J, Moore F, Nance D, Hall B, Elkins J, Tanner D, Gregory Huey L, Hall SR, Ullmann K, Orlando JJ, Tyndall GS, Flocke FM, Ray E, Hanisco TF, Wolfe GM, St.Clair J, Commane R, Daube B, Barletta B, Blake DR, Weinzierl B, Dollner M, Conley A, Vitt F, Wofsy SC, Riemer DD. Atmospheric Acetaldehyde: Importance of Air-Sea Exchange and a Missing Source in the Remote Troposphere. GEOPHYSICAL RESEARCH LETTERS 2019; 46:5601-5613. [PMID: 32606484 PMCID: PMC7325730 DOI: 10.1029/2019gl082034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 04/18/2019] [Indexed: 06/02/2023]
Abstract
We report airborne measurements of acetaldehyde (CH3CHO) during the first and second deployments of the National Aeronautics and Space Administration (NASA) Atmospheric Tomography Mission (ATom). The budget of CH3CHO is examined using the Community Atmospheric Model with chemistry (CAM-chem), with a newly-developed online air-sea exchange module. The upper limit of the global ocean net emission of CH3CHO is estimated to be 34 Tg a-1 (42 Tg a-1 if considering bubble-mediated transfer), and the ocean impacts on tropospheric CH3CHO are mostly confined to the marine boundary layer. Our analysis suggests that there is an unaccounted CH3CHO source in the remote troposphere and that organic aerosols can only provide a fraction of this missing source. We propose that peroxyacetic acid (PAA) is an ideal indicator of the rapid CH3CHO production in the remote troposphere. The higher-than-expected CH3CHO measurements represent a missing sink of hydroxyl radicals (and halogen radical) in current chemistry-climate models.
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Affiliation(s)
- Siyuan Wang
- Advanced Study Program (ASP), National Center for Atmospheric Research, Boulder CO, 80301
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Eric C. Apel
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Rebecca S. Hornbrook
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Alan Hills
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Louisa K. Emmons
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Simone Tilmes
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
- Climate and Global Dynamics, National Center for Atmospheric Research, Boulder CO, 80301
| | - Jean-François Lamarque
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
- Climate and Global Dynamics, National Center for Atmospheric Research, Boulder CO, 80301
| | - Jose L. Jimenez
- Department of Chemistry and Biochemistry, University of Colorado Boulder, CO 80309
- Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, CO 80309
| | - Pedro Campuzano-Jost
- Department of Chemistry and Biochemistry, University of Colorado Boulder, CO 80309
- Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, CO 80309
| | - Benjamin A. Nault
- Department of Chemistry and Biochemistry, University of Colorado Boulder, CO 80309
- Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, CO 80309
| | - John D. Crounse
- Division of Engineering and Applied Science, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125
| | - Paul O. Wennberg
- Division of Engineering and Applied Science, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125
| | - Thomas B. Ryerson
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - Chelsea R. Thompson
- Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, CO 80309
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - Jeff Peischl
- Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, CO 80309
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - Fred Moore
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - David Nance
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - Brad Hall
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - James Elkins
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - David Tanner
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332
| | - L. Gregory Huey
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332
| | - Samuel R. Hall
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Kirk Ullmann
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - John J. Orlando
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Geoff S. Tyndall
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Frank M. Flocke
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Eric Ray
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - Thomas F. Hanisco
- Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD 20771
| | - Glenn M. Wolfe
- Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD 20771
- Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, MD 21228
| | - Jason St.Clair
- Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD 20771
- Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, MD 21228
| | - Róisín Commane
- Harvard School of Engineering and Applied Sciences, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138
- Department of Earth & Environmental Sciences, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964
| | - Bruce Daube
- Harvard School of Engineering and Applied Sciences, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138
| | - Barbara Barletta
- Department of Chemistry, University of California Irvine, Irvine; CA 92697
| | - Donald R. Blake
- Department of Chemistry, University of California Irvine, Irvine; CA 92697
| | - Bernadett Weinzierl
- Faculty of Physics, Aerosol Physics and Environmental Physics, University of Vienna, Wien, Austria
| | - Maximilian Dollner
- Faculty of Physics, Aerosol Physics and Environmental Physics, University of Vienna, Wien, Austria
| | - Andrew Conley
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Francis Vitt
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Steven C. Wofsy
- Harvard School of Engineering and Applied Sciences, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138
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19
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Iyer S, Rissanen MP, Kurtén T. Reaction between Peroxy and Alkoxy Radicals Can Form Stable Adducts. J Phys Chem Lett 2019; 10:2051-2057. [PMID: 30958011 PMCID: PMC6727596 DOI: 10.1021/acs.jpclett.9b00405] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 04/08/2019] [Indexed: 05/03/2023]
Abstract
Peroxy (RO2) and alkoxy (RO) radicals are prototypical intermediates in any hydrocarbon oxidation. In this work, we use computational methods to (1) study the mechanism and kinetics of the RO2 + OH reaction for previously unexplored "R" structures (R = CH(O)CH2 and R = CH3C(O)) and (2) investigate a hitherto unaccounted channel of molecular growth, R'O2 + RO. On the singlet surface, these reactions rapidly form ROOOH and R'OOOR adducts, respectively. The former decomposes to RO + HO2 and R(O)OH + O2 products, while the main decomposition channel for the latter is back to the reactant radicals. Decomposition rates of R'OOOR adducts varied between 103 and 0.015 s-1 at 298 K and 1 atm. The most long-lived R'OOOR adducts likely account for some fraction of the elemental compositions detected in the atmosphere that are commonly assigned to stable covalently bound dimers.
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Affiliation(s)
- Siddharth Iyer
- Department of Chemistry and Institute
for Atmospheric and Earth System Research (INAR), University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
| | - Matti P. Rissanen
- Aerosol
Physics Laboratory, Physics Unit, Tampere
University, FI-33101 Tampere, Finland
- Department
of Physics and Institute for Atmospheric and Earth System Research
(INAR), University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - Theo Kurtén
- Department of Chemistry and Institute
for Atmospheric and Earth System Research (INAR), University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
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20
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Lin X, Yang Z, Yu H, Gai Y, Zhang W. Mechanism and kinetics of the atmospheric reaction of 1,3,5-trimethylbenzene bicyclic peroxy radical with OH. RSC Adv 2019; 9:32594-32600. [PMID: 35529717 PMCID: PMC9073362 DOI: 10.1039/c9ra06562h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 10/07/2019] [Indexed: 01/03/2023] Open
Abstract
The bicyclic peroxy radical (BPR) is the key intermediate during atmospheric oxidation of aromatics. In this paper, the reaction mechanisms and kinetics of the atmospheric reaction of the 1,3,5-trimethylbenzene (1,3,5-TMB) BPR with the OH radical were studied by density functional theory (DFT) and conventional transition-state theory (CTST) calculations. The product channels of formation of the 1,3,5-TMB trioxide (ROOOH), OH-adducts and Criegee intermediate (CI) have been identified, and the geometries and energies of all the stationary points were calculated at the M08-HX/6-311 + g(2df,2p) level of theory. In addition, the rate constants for the individual reaction pathway at 298 K were calculated. The results showed that OH addition reactions including the formation of ROOOH and OH-adducts are the main pathways, whereas Criegee intermediate formation is of minor importance. The major pathways in the reaction of the 1,3,5-trimethylbenzene bicyclic peroxy radical with OH.![]()
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Affiliation(s)
- Xiaoxiao Lin
- Laboratory of Atmospheric Physico-Chemistry
- Anhui Institute of Optics and Fine Mechanics
- Chinese Academy of Sciences
- Hefei
- China
| | - Zhenli Yang
- Laboratory of Atmospheric Physico-Chemistry
- Anhui Institute of Optics and Fine Mechanics
- Chinese Academy of Sciences
- Hefei
- China
| | - Hui Yu
- Laboratory of Atmospheric Physico-Chemistry
- Anhui Institute of Optics and Fine Mechanics
- Chinese Academy of Sciences
- Hefei
- China
| | - Yanbo Gai
- Laboratory of Atmospheric Physico-Chemistry
- Anhui Institute of Optics and Fine Mechanics
- Chinese Academy of Sciences
- Hefei
- China
| | - Weijun Zhang
- Laboratory of Atmospheric Physico-Chemistry
- Anhui Institute of Optics and Fine Mechanics
- Chinese Academy of Sciences
- Hefei
- China
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21
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Wen Z, Tang X, Wang C, Fittschen C, Wang T, Zhang C, Yang J, Pan Y, Liu F, Zhang W. A vacuum ultraviolet photoionization time-of-flight mass spectrometer with high sensitivity for study of gas-phase radical reaction in a flow tube. INT J CHEM KINET 2018. [DOI: 10.1002/kin.21241] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Zuoying Wen
- Laboratory of Atmospheric Physico-Chemistry; Anhui Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; Hefei China
- Graduate School; University of Science and Technology of China; Hefei China
| | - Xiaofeng Tang
- Laboratory of Atmospheric Physico-Chemistry; Anhui Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; Hefei China
| | - Chengcheng Wang
- Laboratory of Atmospheric Physico-Chemistry; Anhui Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; Hefei China
- Graduate School; University of Science and Technology of China; Hefei China
| | - Christa Fittschen
- University Lille; PC2A, UMR CNRS-ULille 8522 Villeneuve d'Ascq France
| | - Tao Wang
- Laboratory of Atmospheric Physico-Chemistry; Anhui Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; Hefei China
| | - Cuihong Zhang
- Laboratory of Atmospheric Physico-Chemistry; Anhui Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; Hefei China
- Graduate School; University of Science and Technology of China; Hefei China
| | - Jiuzhong Yang
- National Synchrotron Radiation Laboratory; University of Science and Technology of China; Hefei China
| | - Yang Pan
- National Synchrotron Radiation Laboratory; University of Science and Technology of China; Hefei China
| | - Fuyi Liu
- National Synchrotron Radiation Laboratory; University of Science and Technology of China; Hefei China
| | - Weijun Zhang
- Laboratory of Atmospheric Physico-Chemistry; Anhui Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; Hefei China
- School of Environmental Science and Optoelectronic Technology; University of Science and Technology of China; Hefei China
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22
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Anglada JM, Solé A. Tropospheric oxidation of methyl hydrotrioxide (CH 3OOOH) by hydroxyl radical. Phys Chem Chem Phys 2018; 20:27406-27417. [PMID: 30357171 DOI: 10.1039/c8cp04486d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have employed high level theoretical methods to investigate the oxidation of methyl hydrotrioxide by hydroxyl radical, which is of interest in atmospheric chemistry research. The reaction can proceed by abstraction of either the terminal hydrogen atom of OOH group producing CH3O, O2 and H2O, or one hydrogen atom of the CH3 group forming H2CO, HO2 and H2O. The rate constants for both reactions at 298 K are computed to be 4.7 × 10-11 and 2.1 × 10-12 cm3 molecule-1 s-1, respectively, that is, the abstraction of terminal hydrogen atom of the OOH group is about 22 times faster than that of a hydrogen atom of the CH3 group. The rate constant for the overall CH3OOOH + OH reaction is computed to be 4.9 × 10-11 cm3 molecule-1 s-1. Our calculations predict branching ratios between 99.0 and 93.9% for the formation of methoxy radical plus molecular oxygen and water, and between 1.0 and 6.1% for the formation of formaldehyde plus hydroperoxyl radical and water, in the 225-325 K temperature range. The lifetime of CH3OOOH in the troposphere is predicted to range from of 1.8 hours at 225 K, up to 3.9 hours at 275 K and decreasing to 0.2 hours at 310 K. CH3OOO and CH2OOOH radicals have been also investigated.
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Affiliation(s)
- Josep M Anglada
- Departament de Química Biològica, (IQAC - CSIC), Jordi Girona, 18-26, E-08034 Barcelona, Spain.
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23
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Caravan RL, Khan MAH, Zádor J, Sheps L, Antonov IO, Rotavera B, Ramasesha K, Au K, Chen MW, Rösch D, Osborn DL, Fittschen C, Schoemaecker C, Duncianu M, Grira A, Dusanter S, Tomas A, Percival CJ, Shallcross DE, Taatjes CA. The reaction of hydroxyl and methylperoxy radicals is not a major source of atmospheric methanol. Nat Commun 2018; 9:4343. [PMID: 30341291 PMCID: PMC6195545 DOI: 10.1038/s41467-018-06716-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 08/05/2018] [Indexed: 11/18/2022] Open
Abstract
Methanol is a benchmark for understanding tropospheric oxidation, but is underpredicted by up to 100% in atmospheric models. Recent work has suggested this discrepancy can be reconciled by the rapid reaction of hydroxyl and methylperoxy radicals with a methanol branching fraction of 30%. However, for fractions below 15%, methanol underprediction is exacerbated. Theoretical investigations of this reaction are challenging because of intersystem crossing between singlet and triplet surfaces - ∼45% of reaction products are obtained via intersystem crossing of a pre-product complex - which demands experimental determinations of product branching. Here we report direct measurements of methanol from this reaction. A branching fraction below 15% is established, consequently highlighting a large gap in the understanding of global methanol sources. These results support the recent high-level theoretical work and substantially reduce its uncertainties.
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Affiliation(s)
- Rebecca L Caravan
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA.
| | - M Anwar H Khan
- School of Chemistry, Cantock's Close, University of Bristol, Bristol, BS8 1TS, UK
| | - Judit Zádor
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Leonid Sheps
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Ivan O Antonov
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Brandon Rotavera
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Krupa Ramasesha
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Kendrew Au
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Ming-Wei Chen
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Daniel Rösch
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - David L Osborn
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Christa Fittschen
- Université Lille, CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, 59000, Lille, France
| | - Coralie Schoemaecker
- Université Lille, CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, 59000, Lille, France
| | - Marius Duncianu
- IMT Lille Douai, Université Lille, Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), 59000, Lille, France
| | - Asma Grira
- IMT Lille Douai, Université Lille, Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), 59000, Lille, France
| | - Sebastien Dusanter
- IMT Lille Douai, Université Lille, Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), 59000, Lille, France
| | - Alexandre Tomas
- IMT Lille Douai, Université Lille, Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), 59000, Lille, France
| | - Carl J Percival
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA
| | - Dudley E Shallcross
- School of Chemistry, Cantock's Close, University of Bristol, Bristol, BS8 1TS, UK.
| | - Craig A Taatjes
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA.
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24
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Assaf E, Schoemaecker C, Vereecken L, Fittschen C. Experimental and theoretical investigation of the reaction of RO2radicals with OH radicals: Dependence of the HO2yield on the size of the alkyl group. INT J CHEM KINET 2018. [DOI: 10.1002/kin.21191] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Emmanuel Assaf
- Université Lille; CNRS; UMR 8522, PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère; Lille France
| | - Coralie Schoemaecker
- Université Lille; CNRS; UMR 8522, PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère; Lille France
| | - Luc Vereecken
- Institut für Energie und Klimaforschung; Forschungszentrum Jülich GmbH; Jülich Germany
| | - Christa Fittschen
- Université Lille; CNRS; UMR 8522, PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère; Lille France
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25
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Khan MAH, Percival CJ, Caravan RL, Taatjes CA, Shallcross DE. Criegee intermediates and their impacts on the troposphere. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2018; 20:437-453. [PMID: 29480909 DOI: 10.1039/c7em00585g] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Criegee intermediates (CIs), carbonyl oxides formed in ozonolysis of alkenes, play key roles in the troposphere. The decomposition of CIs can be a significant source of OH to the tropospheric oxidation cycle especially during nighttime and winter months. A variety of model-measurement studies have estimated surface-level stabilized Criegee intermediate (sCI) concentrations on the order of 1 × 104 cm-3 to 1 × 105 cm-3, which makes a non-negligible contribution to the oxidising capacity in the terrestrial boundary layer. The reactions of sCI with the water monomer and the water dimer have been found to be the most important bimolecular reactions to the tropospheric sCI loss rate, at least for the smallest carbonyl oxides; the products from these reactions (e.g. hydroxymethyl hydroperoxide, HMHP) are also of importance to the atmospheric oxidation cycle. The sCI can oxidise SO2 to form SO3, which can go on to form a significant amount of H2SO4 which is a key atmospheric nucleation species and therefore vital to the formation of clouds. The sCI can also react with carboxylic acids, carbonyl compounds, alcohols, peroxy radicals and hydroperoxides, and the products of these reactions are likely to be highly oxygenated species, with low vapour pressures, that can lead to nucleation and SOA formation over terrestrial regions.
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Affiliation(s)
- M A H Khan
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
| | - C J Percival
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr, Pasadena, CA 91109, USA
| | - R L Caravan
- Combustion Research Facility, Sandia National Laboratories, Mailstop 9055, Livermore, California, 94551 USA
| | - C A Taatjes
- Combustion Research Facility, Sandia National Laboratories, Mailstop 9055, Livermore, California, 94551 USA
| | - D E Shallcross
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
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26
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Assaf E, Schoemaecker C, Vereecken L, Fittschen C. The reaction of fluorine atoms with methanol: yield of CH3O/CH2OH and rate constant of the reactions CH3O + CH3O and CH3O + HO2. Phys Chem Chem Phys 2018; 20:10660-10670. [DOI: 10.1039/c7cp05770a] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Measurement and theory of CH3O + HO2 and CH3O + CH3O reactions, product yields for F + CH3OH.
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Affiliation(s)
- Emmanuel Assaf
- Université Lille
- CNRS
- UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l’Atmosphère
- F-59000 Lille
- France
| | - Coralie Schoemaecker
- Université Lille
- CNRS
- UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l’Atmosphère
- F-59000 Lille
- France
| | - Luc Vereecken
- Institut für Energie und Klimaforschung
- Forschungszentrum Jülich GmbH
- D-52428 Jülich
- Germany
| | - Christa Fittschen
- Université Lille
- CNRS
- UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l’Atmosphère
- F-59000 Lille
- France
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27
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Fittschen C, Assaf E, Vereecken L. Experimental and Theoretical Investigation of the Reaction NO + OH + O2 → HO2 + NO2. J Phys Chem A 2017; 121:4652-4657. [DOI: 10.1021/acs.jpca.7b02499] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Christa Fittschen
- Université
Lille, CNRS, UMR 8522 - PC2A -Physicochimie des Processus de Combustion et de l′Atmosphère, F-59000 Lille, France
| | - Emmanuel Assaf
- Université
Lille, CNRS, UMR 8522 - PC2A -Physicochimie des Processus de Combustion et de l′Atmosphère, F-59000 Lille, France
| | - Luc Vereecken
- Forschungszentrum
Jülich GmbH, Institut für Energie und Klimaforschung, 52428 Jülich, Germany
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