scholarly journals Pressure dependent low temperature kinetics for CN + CH3CN: competition between chemical reaction and van der Waals complex formation

2016 ◽  
Vol 18 (22) ◽  
pp. 15118-15132 ◽  
Author(s):  
Chantal Sleiman ◽  
Sergio González ◽  
Stephen J. Klippenstein ◽  
Dahbia Talbi ◽  
Gisèle El Dib ◽  
...  
Keyword(s):  
Low Temperature ◽  
Complex Formation ◽  
Gas Phase ◽  
Rate Coefficient ◽  
Flow Reactor ◽  
Slow Flow ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Low Temperature Kinetics ◽  
Temperature And Pressure

The gas phase reaction between the CN radical and acetonitrile CH3CN was investigated experimentally with a CRESU apparatus and a slow flow reactor as well as theoretically to explore the temperature and pressure dependence of its rate coefficient from 354 K down to 23 K.

scholarly journals A low temperature investigation of the gas-phase N(2D) + NO reaction. Towards a viable source of N(2D) atoms for kinetic studies in astrochemistry

2018 ◽  
Vol 20 (25) ◽  
pp. 17442-17447 ◽  
Author(s):  
Dianailys Nuñez-Reyes ◽  
Kevin M. Hickson
Keyword(s):  
Nitric Oxide ◽  
Supersonic Flow ◽  
Low Temperature ◽  
Gas Phase ◽  
Flow Reactor ◽  
Kinetic Studies ◽  
Phase Reaction ◽  
Atomic Nitrogen ◽  
Gas Phase Reaction ◽  
Temperature Range

The gas-phase reaction of metastable atomic nitrogen N(2D) with nitric oxide has been investigated over the 296–50 K temperature range using a supersonic flow reactor.

scholarly journals Low temperature gas phase reaction rate coefficient measurements: Toward modeling of stellar winds and the interstellar medium

2019 ◽  
Vol 15 (S350) ◽  
pp. 382-383
Author(s):  
Niclas A. West ◽  
Edward Rutter ◽  
Mark A. Blitz ◽  
Leen Decin ◽  
Dwayne E. Heard
Keyword(s):  
Low Temperature ◽  
Interstellar Medium ◽  
Gas Phase ◽  
Low Temperatures ◽  
Reaction Rate ◽  
Rate Coefficient ◽  
Building Blocks ◽  
Rate Coefficients ◽  
Stellar Winds ◽  
Phase Reaction

AbstractStellar winds of Asymptotic Giant Branch (AGB) stars are responsible for the production of ∼85% of the gas molecules in the interstellar medium (ISM), and yet very few of the gas phase rate coefficients under the relevant conditions (10 – 3000 K) needed to model the rate of production and loss of these molecules in stellar winds have been experimentally measured. If measured at all, the value of the rate coefficient has often only been obtained at room temperature, with extrapolation to lower and higher temperatures using the Arrhenius equation. However, non-Arrhenius behavior has been observed often in the few measured rate coefficients at low temperatures. In previous reactions studied, theoretical simulations of the formation of long-lived pre-reaction complexes and quantum mechanical tunneling through the barrier to reaction have been utilized to fit these non-Arrhenius behaviours of rate coefficients.Reaction rate coefficients that were predicted to produce the largest change in the production/loss of Complex Organic Molecules (COMs) in stellar winds at low temperatures were selected from a sensitivity analysis. Here we present measurements of rate coefficients using a pulsed Laval nozzle apparatus with the Pump Laser Photolysis - Laser Induced Fluorescence (PLP-LIF) technique. Gas flow temperatures between 30 – 134 K have been produced by the University of Leeds apparatus through the controlled expansion of N2 or Ar gas through Laval nozzles of a range of Mach numbers between 2.49 and 4.25.Reactions of interest include those of OH, CN, and CH with volatile organic species, in particular formaldehyde, a molecule which has been detected in the ISM. Kinetics measurements of these reactions at low temperatures will be presented using the decay of the radical reagent. Since formaldehyde and the formal radical (HCO) are potential building blocks of COMs in the interstellar medium, low temperature reaction rate coefficients for their production and loss can help to predict the formation pathways of COMs observed in the interstellar medium.

Gas-Phase Reaction of NOXFormation in Oxyfuel Coal Combustion at Low Temperature

2011 ◽  
Vol 25 (6) ◽  
pp. 2481-2486 ◽  
Author(s):  
Ryo Yoshiie ◽  
Takuya Kawamoto ◽  
Daisuke Hasegawa ◽  
Yasuaki Ueki ◽  
Ichiro Naruse
Keyword(s):  
Low Temperature ◽  
Gas Phase ◽  
Coal Combustion ◽  
Phase Reaction ◽  
Gas Phase Reaction

Gas-phase reaction of (E)-β-farnesene with ozone: Rate coefficient and carbonyl products

2009 ◽  
Vol 43 (20) ◽  
pp. 3182-3190 ◽  
Author(s):  
Ivan Kourtchev ◽  
Iustinian Bejan ◽  
John R. Sodeau ◽  
John C. Wenger
Keyword(s):  
Gas Phase ◽  
Rate Coefficient ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Carbonyl Products

Reaction of O(3P) Atoms with Benzene

2004 ◽  
Vol 218 (4) ◽  
pp. 391-404 ◽  
Author(s):  
Torsten Berndt ◽  
Olaf Böge
Keyword(s):  
Gas Phase ◽  
Pressure Range ◽  
Rate Coefficient ◽  
Flow System ◽  
Product Formation ◽  
Phase Reaction ◽  
Experimental Conditions ◽  
Consecutive Reaction ◽  
Gas Phase Reaction ◽  
Benzene Oxide

AbstractThe gas-phase reaction of O(3P) atoms with benzene was investigated in a flow system in the pressure range of 50–100mbar and a temperature of 295 ± 2K with a focus on the product formation. O2 concentrations in the carrier gas were in the range of (7.7–84) × 1014 molecule cm−3. The primary stable products detected were phenol, benzene oxide/oxepin and a not identified compound with the probable composition C5H6O. The yields of phenol and benzene oxide/oxepin were 0.12 ± 0.02 and 0.26 ± 0.06, respectively, being not affected by the experimental conditions. For benzene oxide/oxepin, a rapid consecutive reaction with O(3P) atoms was observed with a rate coefficient of k(295K) = (1.1 ± 0.1) × 10−10cm3 molecule−1s−1 measured at a pressure of 100mbar. A substance with the formula C6H6O2 (likely oxepin 4,5-epoxide or oxepin 2,3-epoxide), the isomers of muconaldehyde, as well as formic acid, acrolein and trans-butenedial were identified as products of the reaction of O(3P) atoms with benzene oxide/oxepin.

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