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Zhang C, Li C, Zhang W, Tang X, Pillier L, Schoemaecker C, Fittschen C. Rate constant and branching ratio of the reaction of ethyl peroxy radicals with methyl peroxy radicals. Phys Chem Chem Phys 2023. [PMID: 37377107 DOI: 10.1039/d3cp01141k] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
The cross-reaction of ethyl peroxy radicals (C2H5O2) with methyl peroxy radicals (CH3O2) (R1) has been studied using laser photolysis coupled to time resolved detection of the two different peroxy radicals by continuous wave cavity ring down spectroscopy (cw-CRDS) in their AÃ-X̃ electronic transition in the near-infrared region, C2H5O2 at 7602.25 cm-1, and CH3O2 at 7488.13 cm-1. This detection scheme is not completely selective for both radicals, but it is demonstrated that it has great advantages compared to the widely used, but unselective UV absorption spectroscopy. Peroxy radicals were generated from the reaction of Cl-atoms with the appropriate hydrocarbon (CH4 and C2H6) in the presence of O2, whereby Cl-atoms were generated by 351 nm photolysis of Cl2. For different reasons detailed in the manuscript, all experiments were carried out under excess of C2H5O2 over CH3O2. The experimental results were best reproduced by an appropriate chemical model with a rate constant for the cross-reaction of k = (3.8 ± 1.0) × 10-13 cm3 s-1 and a yield for the radical channel, leading to CH3O and C2H5O, of (ϕ1a = 0.40 ± 0.20).
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Affiliation(s)
- Cuihong Zhang
- Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China
- Science Island Branch, Graduate School, University of Science and Technology of China, Hefei 230026, Anhui, China
- Université Lille, CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France.
| | - Chuanliang Li
- Université Lille, CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France.
- Shanxi Engineering Research Center of Precision Measurement and Online Detection Equipment and School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Weijun Zhang
- Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - Xiaofeng Tang
- Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China
| | - Laure Pillier
- 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.
| | - 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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2
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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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3
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Rate Constants and Branching Ratios for the Self-Reaction of Acetyl Peroxy (CH3C(O)O2•) and Its Reaction with CH3O2. ATMOSPHERE 2022. [DOI: 10.3390/atmos13020186] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The self-reaction of acetylperoxy radicals (CH3C(O)O2•) (R1) as well as their reaction with methyl peroxy radicals (CH3O2•) (R2) have been studied using laser photolysis coupled to a selective time resolved detection of three different radicals by cw-CRDS in the near-infrared range: CH3C(O)O2• was detected in the Ã-X˜ electronic transition at 6497.94 cm−1, HO2• was detected in the 2ν1 vibrational overtone at 6638.2 cm−1, and CH3O2• radicals were detected in the Ã-X˜ electronic transition at 7489.16 cm−1. Pulsed photolysis of different precursors at different wavelengths, always in the presence of O2, was used to generate CH3C(O)O2• and CH3O2• radicals: acetaldehyde (CH3CHO/Cl2 mixture or biacetyle (CH3C(O)C(O)CH3) at 351 nm, and acetone (CH3C(O)CH3) or CH3C(O)C(O)CH3 at 248 nm. From photolysis experiments using CH3C(O)C(O)CH3 or CH3C(O)CH3 as precursor, the rate constant for the self-reaction was found with k1 = (1.3 ± 0.3) × 10−11 cm3s−1, in good agreement with current recommendations, while the rate constant for the cross reaction with CH3O2• was found to be k2 = (2.0 ± 0.4) × 10−11 cm3s−1, which is nearly two times faster than current recommendations. The branching ratio of (R2) towards the radical products was found at 0.67, compared with 0.9 for the currently recommended value. Using the reaction of Cl•-atoms with CH3CHO as precursor resulted in radical profiles that were not reproducible by the model: secondary chemistry possibly involving Cl• or Cl2 might occur, but could not be identified.
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4
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Absolute Absorption Cross-Section of the Ã←X˜ Electronic Transition of the Ethyl Peroxy Radical and Rate Constant of Its Cross Reaction with HO2. PHOTONICS 2021. [DOI: 10.3390/photonics8080296] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The absolute absorption cross-section of the ethyl peroxy radical C2H5O2 in the Ã←X˜ electronic transition with the peak wavelength at 7596 cm−1 has been determined by the method of dual wavelengths time resolved continuous wave cavity ring down spectroscopy. C2H5O2 radicals were generated from pulsed 351 nm photolysis of C2H6/Cl2 mixture in presence of 100 Torr O2 at T = 295 K. C2H5O2 radicals were detected on one of the CRDS paths. Two methods have been applied for the determination of the C2H5O2 absorption cross-section: (i) based on Cl-atoms being converted alternatively to either C2H5O2 by adding C2H6 or to hydro peroxy radicals, HO2, by adding CH3OH to the mixture, whereby HO2 was reliably quantified on the second CRDS path in the 2ν1 vibrational overtone at 6638.2 cm−1 (ii) based on the reaction of C2H5O2 with HO2, measured under either excess HO2 or under excess C2H5O2 concentration. Both methods lead to the same peak absorption cross-section for C2H5O2 at 7596 cm−1 of σ = (1.0 ± 0.2) × 10−20 cm2. The rate constant for the cross reaction between of C2H5O2 and HO2 has been measured to be (6.2 ± 1.5) × 10−12 cm3 molecule−1 s−1.
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5
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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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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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7
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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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8
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Assaf E, Tanaka S, Kajii Y, Schoemaecker C, Fittschen C. Rate constants of the reaction of C2–C4 peroxy radicals with OH radicals. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.06.062] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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9
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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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10
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Assaf E, Sheps L, Whalley L, Heard D, Tomas A, Schoemaecker C, Fittschen C. The Reaction between CH 3O 2 and OH Radicals: Product Yields and Atmospheric Implications. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:2170-2177. [PMID: 28121426 DOI: 10.1021/acs.est.6b06265] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The reaction between CH3O2 and OH radicals has been shown to be fast and to play an appreciable role for the removal of CH3O2 radials in remote environments such as the marine boundary layer. Two different experimental techniques have been used here to determine the products of this reaction. The HO2 yield has been obtained from simultaneous time-resolved measurements of the absolute concentration of CH3O2, OH, and HO2 radicals by cw-CRDS. The possible formation of a Criegee intermediate has been measured by broadband cavity enhanced UV absorption. A yield of ϕHO2 = (0.8 ± 0.2) and an upper limit for ϕCriegee = 0.05 has been determined for this reaction, suggesting a minor yield of methanol or stabilized trioxide as a product. The impact of this reaction on the composition of the remote marine boundary layer has been determined by implementing these findings into a box model utilizing the Master Chemical Mechanism v3.2, and constraining the model for conditions found at the Cape Verde Atmospheric Observatory in the remote tropical Atlantic Ocean. Inclusion of the CH3O2+OH reaction into the model results in up to 30% decrease in the CH3O2 radical concentration while the HO2 concentration increased by up to 20%. Production and destruction of O3 are also influenced by these changes, and the model indicates that taking into account the reaction between CH3O2 and OH leads to a 6% decrease of O3.
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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
| | - Leonid Sheps
- Combustion Research Facility, Sandia National Laboratories , 7011 East Ave., Livermore, California 94551 United States
| | - Lisa Whalley
- School of Chemistry, University of Leeds , Woodhouse Lane, Leeds, LS2 9JT, U.K
- National Centre for Atmospheric Chemistry, University of Leeds , Woodhouse Lane, Leeds, LS2 9JT, U.K
| | - Dwayne Heard
- School of Chemistry, University of Leeds , Woodhouse Lane, Leeds, LS2 9JT, U.K
- National Centre for Atmospheric Chemistry, University of Leeds , Woodhouse Lane, Leeds, LS2 9JT, U.K
| | - Alexandre Tomas
- IMT Lille Douai, Université Lille, SAGE - Département Sciences de l'Atmosphère et Génie de l'Environnement, 59000 Lille, France
| | - Coralie Schoemaecker
- 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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11
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Assaf E, Song B, Tomas A, Schoemaecker C, Fittschen C. Rate Constant of the Reaction between CH 3O 2 Radicals and OH Radicals Revisited. J Phys Chem A 2016; 120:8923-8932. [PMID: 27790905 DOI: 10.1021/acs.jpca.6b07704] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction between CH3O2 and OH radicals has been studied in a laser photolysis cell using the reaction of F atoms with CH4 and H2O for the simultaneous generation of both radicals, with F atoms generated through 248 nm photolysis of XeF2. An experimental setup combining cw-Cavity Ring Down Spectroscopy (cw-CRDS) and high repetition rate laser-induced fluorescence (LIF) to a laser photolysis cell has been used. The absolute concentration of CH3O2 was measured by cw-CRDS, while the relative concentration of OH(v = 0) radicals was determined by LIF. To remove dubiety from the quantification of CH3O2 by cw-CRDS in the near-infrared, its absorption cross section has been determined at 7489.16 cm-1 using two different methods. A rate constant of k1 = (1.60 ± 0.4) × 10-10 cm3 s-1 has been determined at 295 K, nearly a factor of 2 lower than an earlier determination from our group ((2.8 ± 1.4) × 10-10 cm3 s-1) using CH3I photolysis as a precursor. Quenching of electronically excited I atoms (from CH3I photolysis) in collision with OH(v = 0) is suspected to be responsible for a bias in the earlier, fast rate constant.
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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
| | - Bo Song
- Université Lille , CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
| | - Alexandre Tomas
- Mines Douai , Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), F-59508 Douai, France.,Université Lille Nord de France , 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
| | - 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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12
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Arpaia P, Cimmino P. Flexible architecture of data acquisition firmware based on multi-behaviors finite state machine. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:115113. [PMID: 27910517 DOI: 10.1063/1.4967467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A flexible firmware architecture for different kinds of data acquisition systems, ranging from high-precision bench instruments to low-cost wireless transducers networks, is presented. The key component is a multi-behaviors finite state machine, easily configurable to both low- and high-performance requirements, to diverse operating systems, as well as to on-line and batch measurement algorithms. The proposed solution was validated experimentally on three case studies with data acquisition architectures: (i) concentrated, in a high-precision instrument for magnetic measurements at CERN, (ii) decentralized, for telemedicine remote monitoring of patients at home, and (iii) distributed, for remote monitoring of building's energy loss.
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Affiliation(s)
- Pasquale Arpaia
- Department of Electrical Engineering and Information Technology, University of Napoli Federico II, Napoli 80125, Italy
| | - Pasquale Cimmino
- Department of Electrical Engineering and Information Technology, University of Napoli Federico II, Napoli 80125, Italy
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13
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Assaf E, Fittschen C. Cross Section of OH Radical Overtone Transition near 7028 cm–1 and Measurement of the Rate Constant of the Reaction of OH with HO2 Radicals. J Phys Chem A 2016; 120:7051-9. [DOI: 10.1021/acs.jpca.6b06477] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Emmanuel Assaf
- CNRS, UMR 8522 - PC2A - Physicochimie
des Processus de Combustion et de l’Atmosphère, Université Lille, F-59000 Lille, France
| | - Christa Fittschen
- CNRS, UMR 8522 - PC2A - Physicochimie
des Processus de Combustion et de l’Atmosphère, Université Lille, F-59000 Lille, France
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14
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Bouzidi H, Djehiche M, Gierczak T, Morajkar P, Fittschen C, Coddeville P, Tomas A. Low-Pressure Photolysis of 2,3-Pentanedione in Air: Quantum Yields and Reaction Mechanism. J Phys Chem A 2015; 119:12781-9. [DOI: 10.1021/acs.jpca.5b09448] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hichem Bouzidi
- Mines Douai, SAGE, 59508 Douai, France
- Université de Lille, 59000 Lille, France
| | - Mokhtar Djehiche
- Mines Douai, SAGE, 59508 Douai, France
- Université de Lille, 59000 Lille, France
| | - Tomasz Gierczak
- Faculty
of Chemistry, Warsaw University, ul. Pasteura 1, Poland
| | - Pranay Morajkar
- Université de Lille 1, PC2A, UMR 8522 CNRS/Lille 1, 59655 Villeneuve d’Ascq, France
| | - Christa Fittschen
- Université de Lille 1, PC2A, UMR 8522 CNRS/Lille 1, 59655 Villeneuve d’Ascq, France
| | - Patrice Coddeville
- Mines Douai, SAGE, 59508 Douai, France
- Université de Lille, 59000 Lille, France
| | - Alexandre Tomas
- Mines Douai, SAGE, 59508 Douai, France
- Université de Lille, 59000 Lille, France
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15
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Faragó EP, Schoemaecker C, Viskolcz B, Fittschen C. Experimental determination of the rate constant of the reaction between C 2 H 5 O 2 and OH radicals. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2014.11.069] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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16
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Morajkar P, Bossolasco A, Schoemaecker C, Fittschen C. Photolysis of CH3CHO at 248 nm: Evidence of triple fragmentation from primary quantum yield of CH3 and HCO radicals and H atoms. J Chem Phys 2014; 140:214308. [DOI: 10.1063/1.4878668] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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18
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Faragó EP, Viskolcz B, Schoemaecker C, Fittschen C. Absorption Spectrum and Absolute Absorption Cross Sections of CH3O2 Radicals and CH3I Molecules in the Wavelength Range 7473–7497 cm–1. J Phys Chem A 2013; 117:12802-11. [DOI: 10.1021/jp408686s] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eszter P. Faragó
- PysicoChimie
des Processus de Combustion et de l’Atmosphère PC2A, CNRS - University Lille 1, Cité Scientifique, Bât. C11, 59655 Villeneuve d’Ascq, France
- Department
of Chemical Informatics, Faculty of Education, University of Szeged, Boldogasszony sgt. 6, Szeged, Hungary 6725
| | - Bela Viskolcz
- Department
of Chemical Informatics, Faculty of Education, University of Szeged, Boldogasszony sgt. 6, Szeged, Hungary 6725
| | - Coralie Schoemaecker
- PysicoChimie
des Processus de Combustion et de l’Atmosphère PC2A, CNRS - University Lille 1, Cité Scientifique, Bât. C11, 59655 Villeneuve d’Ascq, France
| | - Christa Fittschen
- PysicoChimie
des Processus de Combustion et de l’Atmosphère PC2A, CNRS - University Lille 1, Cité Scientifique, Bât. C11, 59655 Villeneuve d’Ascq, France
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19
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Antiñolo M, Bettinelli C, Jain C, Dréan P, Lemoine B, Albaladejo J, Jiménez E, Fittschen C. Photolysis of CF3CH2CHO in the Presence of O2 at 248 and 266 nm: Quantum Yields, Products, and Mechanism. J Phys Chem A 2013; 117:10661-70. [DOI: 10.1021/jp404823b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Antiñolo
- Departamento
de Química Física, Facultad de Ciencias
y Tecnologías Químicas, Universidad de Castilla-La Mancha, Avda.
Camilo José Cela, s/n. 13071 Ciudad Real, Spain
| | - C. Bettinelli
- Laboratoire PhLAM - UMR CNRS 8523, Université Lille Nord de France, Cité Scientifique, 59655 Villeneuve d’Ascq, France
- Laboratoire PC2A - UMR CNRS 8522, Université Lille Nord de France, Cité Scientifique, 59655 Villeneuve d’Ascq, France
| | - C. Jain
- Laboratoire PC2A - UMR CNRS 8522, Université Lille Nord de France, Cité Scientifique, 59655 Villeneuve d’Ascq, France
| | - P. Dréan
- Laboratoire PhLAM - UMR CNRS 8523, Université Lille Nord de France, Cité Scientifique, 59655 Villeneuve d’Ascq, France
| | - B. Lemoine
- Laboratoire PhLAM - UMR CNRS 8523, Université Lille Nord de France, Cité Scientifique, 59655 Villeneuve d’Ascq, France
| | - J. Albaladejo
- Departamento
de Química Física, Facultad de Ciencias
y Tecnologías Químicas, Universidad de Castilla-La Mancha, Avda.
Camilo José Cela, s/n. 13071 Ciudad Real, Spain
| | - E. Jiménez
- Departamento
de Química Física, Facultad de Ciencias
y Tecnologías Químicas, Universidad de Castilla-La Mancha, Avda.
Camilo José Cela, s/n. 13071 Ciudad Real, Spain
| | - C. Fittschen
- Laboratoire PC2A - UMR CNRS 8522, Université Lille Nord de France, Cité Scientifique, 59655 Villeneuve d’Ascq, France
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20
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Morajkar P, Schoemaecker C, Okumura M, Fittschen C. Direct Measurement of the Equilibrium Constants of the Reaction of Formaldehyde and Acetaldehyde with HO2
Radicals. INT J CHEM KINET 2013. [DOI: 10.1002/kin.20817] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Pranay Morajkar
- PhysicoChimie des Processus de Combustion et de l'Atmosphère-PC2A; UMR 8522; Université Lille Nord de France F-59650 Villeneuve d'Ascq France
| | - Coralie Schoemaecker
- PhysicoChimie des Processus de Combustion et de l'Atmosphère-PC2A; UMR 8522; Université Lille Nord de France F-59650 Villeneuve d'Ascq France
| | - Mitchio Okumura
- Division of Chemistry and Chemical Engineering; California Institute of Technology; Pasadena CA 91125 USA
| | - Christa Fittschen
- PhysicoChimie des Processus de Combustion et de l'Atmosphère-PC2A; UMR 8522; Université Lille Nord de France F-59650 Villeneuve d'Ascq France
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21
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Földes T. Note: A very simple circuit for piezo actuator pseudo-tracking for continuous-wave cavity ring-down spectroscopy. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:016102. [PMID: 23387708 DOI: 10.1063/1.4774044] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A very simple circuit for pseudo-tracking of the piezo actuator for continuous-wave cavity ring-down spectroscopy (cw-CRDS) is presented. The circuit is based on an ordinary positive-edge trigger D-type flip flop integrated circuit, has a low parts count, and can be easily assembled using only off the shelf components. The circuit can be straightforwardly incorporated into most cw-CRDS setups and, thanks to the increased ring-down event rate, higher sensitivity or lower data acquisition time can be achieved.
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Affiliation(s)
- T Földes
- Laboratoire de Chimie quantique et Photophysique, Université libre de Bruxelles, Bruxelles, Belgium.
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