Kinetics of the reaction of the simplest Criegee intermediate with ammonia: a combination of experiment and theory

2018 ◽  
Vol 20 (47) ◽  
pp. 29669-29676 ◽  
Author(s):  
Yiqiang Liu ◽  
Cangtao Yin ◽  
Mica C. Smith ◽  
Siyue Liu ◽  
Maodu Chen ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Rate Coefficient ◽  
Negative Temperature ◽  
Laser Induced Fluorescence ◽  
Fluorescence Method ◽  
Kinetics Of

The negative temperature dependence of the rate coefficient for CH2OO + NH3 reaction was observed using an OH laser-induced fluorescence method.

Temperature dependent kinetics of the reaction of ozone with iodide

2021 ◽  
Author(s):  
Severin Gysin ◽  
Antoine Roose ◽  
Rainer Volkamer ◽  
Thomas Peter ◽  
Markus Ammann
Keyword(s):  
Temperature Dependence ◽  
Rate Coefficient ◽  
Flow Reactor ◽  
Chem Phys ◽  
Physical Parameters ◽  
Temperature Dependent ◽  
Poorly Soluble ◽  
Inorganic Iodine ◽  
Kinetics Of ◽  
State Resistance

<p>Iodine in the atmosphere results from emissions of precursors from the oceans [1, 2] and undergoes continuous multiphase cycling. This cycling also prevents poorly soluble gaseous iodine species from removal by wet deposition. Thus, tropical convective outflow can even inject inorganic iodine into the lower stratosphere [3]. In the troposphere [1] and in the stratosphere [4], iodine appears in the gas- and particulate phase. In both compartments, particulate iodine exists not only in oxidized (as iodate) but also in reduced (as iodide) form [1, 4]. As iodide reacts with ozone in the aqueous phase [2] (which is also a major process related to iodine emission from the oceans), the reaction of ozone with iodide is one wheel of the cycles in the troposphere and may even represent a direct ozone sink in the stratosphere. However, only few kinetic data exist for this reaction. The temperature dependence of the reaction rate coefficient between 275 and 293 K was determined once and extrapolation of its value below 275 K rely on an activation energy estimate with an error of about 40 % [5]. Therefore, we performed laboratory experiments to extend the temperature range of the rate coefficient determination. We used a trough flow reactor [6] for our measurements and analyzed the data with a quasi steady state resistance model [7] to determine the essential physical parameters describing the reaction kinetics and their temperature dependence. Our results help to increase the understanding of atmospheric iodine chemistry and to better assess iodine’s impact on ozone in both, the troposphere and the stratosphere.</p><p>Bibliography<br>[1]          A. Saiz-Lopez et al., Chem. Rev., <strong>112</strong>, 3 (2012)<br>[2]          L. J. Carpenter et al., Nat. Geosci., <strong>6</strong> (2013)<br>[3]          A. Saiz-Lopez et al., Geophys. Res. Lett., <strong>42</strong>, 16 (2015)<br>[4]          T. K. Koenig et al., PNAS, <strong>117</strong>, 4 (2020)<br>[5]          L. Magi et al., J. Phys. Chem. A, <strong>101</strong> (1997)<br>[6]          L. Artiglia et al., Nat. Commun., <strong>8</strong> (2017)<br>[7]          M. Ammann et al., Atmos. Chem. Phys., <strong>13</strong> (2013)</p>

Kinetics and Temperature Dependence of the Hydration of NO+ in the Gas Phase

1973 ◽  
Vol 51 (3) ◽  
pp. 456-461 ◽  
Author(s):  
Margaret A. French ◽  
L. P. Hills ◽  
P. Kebarle
Keyword(s):  
Temperature Dependence ◽  
Gas Phase ◽  
Rate Constants ◽  
Room Temperature ◽  
Transfer Reaction ◽  
Negative Temperature ◽  
Ion Source ◽  
Third Order ◽  
The Third ◽  
Kinetics Of

The kinetics of the atmospherically important hydration sequence: NO+(H2O)n−1 + H2O = NO+(H2O)n and the transfer reaction NO+(H2O)n + H2O = HNO2 + H+(H2O)n were examined in nitrogen containing small quantities of NO and H2O with a pulsed high pressure ion source mass spectrometer. The room temperature mechanism and rate constants were found to be in agreement with earlier work in other laboratories. The temperature dependence of the reaction was examined for the range 27–157 °C. The transfer reaction does not occur at higher temperatures so that the NO+ hydration equilibria for n = 1 and 2 could be measured leading to ΔH1,0 = 18.5 and ΔH2,1 = 16.1 kcal/mol. The third order forward clustering rate constants were found to have negative temperature coefficients.

A kinetic study of the CH2OO Criegee intermediate reaction with SO2, (H2O)2, CH2I2 and I atoms using OH laser induced fluorescence

2017 ◽  
Vol 19 (31) ◽  
pp. 20786-20794 ◽  
Author(s):  
Yiqiang Liu ◽  
Fenghua Liu ◽  
Siyue Liu ◽  
Dongxu Dai ◽  
Wenrui Dong ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Laser Induced Fluorescence ◽  
Fluorescence Method ◽  
Intermediate Reaction ◽  
Kinetics Of

The OH laser induced fluorescence method was used to study the kinetics of CH2OO reacting with SO2, (H2O)2, CH2I2 and I atoms.

scholarly journals The Reaction Kinetics of Amino Radicals with Sulfur Dioxide

2015 ◽  
Vol 229 (10-12) ◽  
Author(s):  
Yide Gao ◽  
Peter Glarborg ◽  
Paul Marshall
Keyword(s):  
Sulfur Dioxide ◽  
Reaction Kinetics ◽  
Laser Induced Fluorescence ◽  
Laser Photolysis ◽  
Fluorescence Method ◽  
Photolysis Laser ◽  
Kinetics Of

AbstractApplication of the laser photolysis–laser-induced fluorescence method to the reaction NH

scholarly journals Gas-phase kinetics of CH3CHO with OH radicals between 11.7 and 177.5 K

2020 ◽  
Vol 22 (36) ◽  
pp. 20562-20572
Author(s):  
Sergio Blázquez ◽  
Daniel González ◽  
Elias M. Neeman ◽  
Bernabé Ballesteros ◽  
Marcelino Agúndez ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Gas Phase ◽  
Rate Coefficient ◽  
Oh Radicals ◽  
Gas Phase Kinetics ◽  
Ultralow Temperatures ◽  
Kinetics Of

Temperature dependence of the rate coefficient for the OH + CH3CHO reaction at ultralow temperatures (11.7–177.5 K): first measurements below 60 K.

scholarly journals Computational study on the mechanism and kinetics for the reaction between HO2 and n-propyl peroxy radical

RSC Advances ◽  
2019 ◽  
Vol 9 (69) ◽  
pp. 40437-40444
Author(s):  
Zhenli Yang ◽  
Xiaoxiao Lin ◽  
Jiacheng Zhou ◽  
Mingfeng Hu ◽  
Yanbo Gai ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Temperature Regime ◽  
Computational Study ◽  
Peroxy Radical ◽  
Negative Temperature ◽  
Mechanism And Kinetics ◽  
Lower Temperature

The negative temperature dependence for the HO2 + n-C3H7O2 reaction in lower temperature regime.

The Kinetics of Methyl Methacrylate Miniemulsion Polymerization Characterized through a Fluorescence Method

2012 ◽  
Vol 178-181 ◽  
pp. 609-612
Author(s):  
Hai Ke Feng ◽  
Hua Yu Qiu ◽  
Li Yuan Ding ◽  
Cun Jin Xu
Keyword(s):  
Methyl Methacrylate ◽  
Anionic Surfactant ◽  
Sodium Dodecyl Sulphate ◽  
Sodium Dodecyl ◽  
Miniemulsion Polymerization ◽  
Time Measurement ◽  
Fluorescence Method ◽  
Real Time Measurement ◽  
Measurement Results ◽  
Kinetics Of

In this paper, we followed the kinetics of methyl methacrylate (MMA) through a novel fluorescence method. The real-time measurement results show that in the regime of very low monomer contents, such as a solution containing 0.1 wt% of MMA with respect to water and with the anionic surfactant of sodium dodecyl sulphate (SDS), the kinetic of the miniemulsion could be followed by this embed fluorescence method. The processes of changing from emulsion to miniemulsion with different amount of surfactant and cosurfactant also have been monitored.

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