ChemInform Abstract: Gas-Phase Reactions of F- with Phenyl Acetates. Translational Energy and Substituent Effects on Product Distribution

ChemInform ◽  
2010 ◽  
Vol 23 (13) ◽  
pp. no-no
Author(s):  
J. M. RIVEROS ◽  
S. INGEMANN ◽  
N. M. M. NIBBERING
Keyword(s):  
Gas Phase ◽  
Substituent Effects ◽  
Product Distribution ◽  
Translational Energy ◽  
Gas Phase Reactions

Excimer Laser Photofragmentation of TMA on Aluminum: Identification of Photoproduct Desorption Dynamics

1988 ◽  
Vol 131 ◽  
Author(s):  
T. E. Orlowski ◽  
D. A. Mantell
Keyword(s):  
Gas Phase ◽  
Excimer Laser ◽  
Direct Evidence ◽  
Hydrogen Abstraction ◽  
Sample Surface ◽  
Translational Energy ◽  
Quadrupole Mass ◽  
Gas Phase Reactions ◽  
Si Substrates ◽  
Site Binding

ABSTRACTNew mechanistic details regarding aluminum deposition by ArF excimer laser photodecomposition of trimethylaluminum (TMA) adsorbed on aluminum covered SiO 2/Si substrates have been obtained using a time-of-flight quadrupole mass spectrometer. CH3 radicals and Al-(CH3)n (n = 1,2,3) species are efficiently photoejected from the surface with up to 0.22 eV of translational energy. Experiments at various TMA dosing levels reveal differences in desorbed fragment translational energy presumably associated with variations in surface site binding energy. No direct evidence is found for desorption of A1 from the surface indicating that A1 is more tightly bound than methyl-aluminum fragments. By carefully monitoring changes in fragment translational energy as an A1 deposit forms on the clean SiO2/Si substrate, we examine how the surface influences the onset of A1 growth. No evidence of ethane or methane desorption from the sample surface is found implying that radical recombination and hydrogen abstraction are primarily secondary gas phase reactions which are not surface initiated.

scholarly journals Crossed-beam chemical reaction dynamics probed with universal and state resolved ion imaging

2018 ◽  
Author(s):  
◽  
Alexander Kamasah
Keyword(s):  
Gas Phase ◽  
Chemical Reactions ◽  
Chemical Reaction ◽  
Reaction Dynamics ◽  
Reaction Cross ◽  
Translational Energy ◽  
Gas Phase Reactions ◽  
Chemical Reaction Dynamics ◽  
Products Of Reaction ◽  
State Selection

The main goal of chemical reaction dynamics is to unravel the intimate motions of individual atoms during a chemical transformation. This information must generally be inferred from indirect macroscopic measurement. Very important information such as translational energy dependence of the reaction cross-section, vibrational mode-specific promotion of reactivity, product angular and velocity distributions are normally extracted. Understanding how these chemical reactions occur at the microscopic level gives us a better insight in understanding reactive intermediates and products of reaction. For a better understanding of the elementary chemical reactions, it is imperative that the studies are performed under well-defined laboratory conditions. Over the last few decades, the field has witnessed unprecedented advances in both experiment and theory. Advancements in generating reactants, state selection, improvement of crossed-molecular beam machines and products detection have gone a long way to improve our ability in studying chemical reactions in the gas phase. In 1986, Hershbach,[1] Lee[2] , and Polayni[3] together shared the Nobel Prize in Chemistry for their work on the dynamics of gas phase reactions.

Chlorination in Combustion Systems

2000 ◽  
Author(s):  
Wing Tsang ◽  
Valeri Babushok
Keyword(s):  
Gas Phase ◽  
Exhaust System ◽  
Product Distribution ◽  
Single Step ◽  
Mixed System ◽  
Gas Phase Reactions ◽  
Lean Combustion ◽  
Combustion Systems ◽  
The Stability ◽  
Propargyl Radicals

Abstract This paper is concerned with the formation of polychorinated organics in the gas phase in combustion systems. The results are derived from simulation studies with inputs from the fundamental kinetics of single step thermal gas phase reactions. Attention is focussed on the case where initial chlorine loading is low. It is shown that in a well mixed system high degrees of chlorination are difficult to attain due to the decrease in thermal stability with chlorination. A hypothesis for their formation as a consequence of chlorine formation during lean combustion followed by chlorination of organics as a result of the mixing and quenching of the products from rich combustion is tested. Under such conditions the competition between oxidation and chlorination of intermediates governs the final product distribution. The stability of propargyl radicals (C3H3) to oxidation makes chlorination of its products a preferred mode and results have been obtained where more highly chlorinated compounds are found in the products. Since this radical is a known precursor to benzene formation, this provides a direct route for the formation of polychlorinated benzenes. The scenario presented here extends regions for possible gas phase chlorination into the exhaust system of combustors.

Gas-Phase Reactions

1981 ◽  
Author(s):  
Victor N. Kondratiev ◽  
Evgeniĭ E. Nikitin
Keyword(s):  
Gas Phase ◽  
Gas Phase Reactions

Kinetic Study of Gas-Phase Reactions of Pyruvic Acid with HO2

2021 ◽  
Author(s):  
Jonathan R. Church ◽  
Veronica Vaida ◽  
Rex T. Skodje
Keyword(s):  
Kinetic Study ◽  
Gas Phase ◽  
Pyruvic Acid ◽  
Gas Phase Reactions
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