Gas Phase Reactions in Horizontal MOCVD Reactors

1987 ◽  
Vol 94 ◽  
Author(s):  
Hitoshi Tanaka ◽  
J. Komeno
Keyword(s):  
Steady State ◽  
Gas Phase ◽  
Chemical Reactions ◽  
Chemical Species ◽  
Kinetic Simulation ◽  
Gas Phase Reactions ◽  
Mocvd Reactor

ABSTRACTWe have applied kinetic simulation to MOCVD chemistry in a horizontal MOCVD reactor. Both chemical reactions and material diffusion are considered. For trimethylgallium decomposition, concentrations of chemical species reach their steady state values which differ largely from the equilibrium values.

The Role of Starting Potential in the Kinetics of Chemical Reactions under Electrodeless Discharge

1970 ◽  
Vol 25 (11) ◽  
pp. 1772
Author(s):  
T.S.R Ao ◽  
A. Patil
Keyword(s):  
Gas Phase ◽  
Chemical Reactions ◽  
Electric Discharge ◽  
Specific Rate ◽  
Gas Phase Reactions ◽  
Electrodeless Discharge ◽  
First Order ◽  
Kinetics Of

Abstract It has been shown that in kinetically first order gas phase reactions occuring under electric discharge, such as the decomposition of N2O, the application, at various initial pressures, of the same multiple of the respective starting potential ensures that the reaction occurs at the same specific rate.

scholarly journals Astrochemistry of Interstellar Clouds: II. Molecular Formation in a Contracting Cloud

1987 ◽  
Vol 120 ◽  
pp. 273-274
Author(s):  
M.A. El Shalaby ◽  
A. Aiad
Keyword(s):  
Gas Phase ◽  
Optical Depth ◽  
Chemical Reactions ◽  
Particle Density ◽  
Interstellar Cloud ◽  
Gas Phase Reactions ◽  
Interstellar Clouds ◽  
Continous Function ◽  
Molecular Formation ◽  
Self Gravity

The chemistry of an 667 Mo interstellar cloud was studied using 142 reactions for 40 species during the contraction under self gravity in two steps. At first the contraction is allowed without gas phase reactions untill certain optical depth is reached. Secondly, at this optical depth the chemical reactions are started for sufficient cycles in a time dependant scheme till only very small additionally changes in the abundances occur. The so obtained, relative abundances and coulmn densities for different species represent a continous function of the optical depths. The values arround τ=6.3 represent the observations for H2, H2+, H3+, OH, OH+, CH, CH+, CH2, CH2+, CH3+, H2O and H3O+. The region of τ between 1 and 5 i.e. of particle density between 4 102–6 103 is the preferable formation place for the majority of molecules.

A PANORAMIC MASS SPECTROSCOPE FOR KINETIC STUDIES

1955 ◽  
Vol 33 (2) ◽  
pp. 74-95 ◽  
Author(s):  
Edouard G. Leger
Keyword(s):  
Gas Phase ◽  
Diethyl Ether ◽  
Motion Picture ◽  
Chemical Species ◽  
Kinetic Studies ◽  
Mass Spectrometric ◽  
Gas Phase Reactions ◽  
Electron Multiplier ◽  
Cool Flames ◽  
Cathode Ray Tube

A mass spectroscope capable of recording the trend of many chemical species in rapid gas-phase reactions is described. The instrument represents a departure from analytical mass spectrometric practice by using a molecular streaming source, rapid electric scanning, an electron multiplier ion detector amplifier, and a cathode ray tube display. A 40 peak spectrum can be scanned in five milliseconds and recorded by a motion picture camera. A few results obtained with this instrument in the study of diethyl ether cool flames are given.

Global minimum profile error (GMPE) – a least-squares-based approach for extracting macroscopic rate coefficients for complex gas-phase chemical reactions

2018 ◽  
Vol 20 (2) ◽  
pp. 1231-1239 ◽  
Author(s):  
Minh v. Duong ◽  
Hieu T. Nguyen ◽  
Tam V.-T. Mai ◽  
Lam K. Huynh
Keyword(s):  
Master Equation ◽  
Least Squares ◽  
Gas Phase ◽  
Chemical Reactions ◽  
Global Minimum ◽  
Rate Coefficients ◽  
Gas Phase Reactions ◽  
Profile Error ◽  
Time Resolved ◽  
Phase Chemical

The new GMPE method was introduced to derive the macroscopic rate coefficients for complex gas-phase reactions from the time-resolved species profiles obtained from the master equation (ME) solutions.

Kinetic simulation of gas phase reactions in MOVPE growth

1988 ◽  
Vol 93 (1-4) ◽  
pp. 115-119 ◽  
Author(s):  
Hitoshi Tanaka ◽  
Junji Komeno
Keyword(s):  
Gas Phase ◽  
Kinetic Simulation ◽  
Gas Phase Reactions ◽  
Movpe Growth

Fire Plume Along Vertical Surfaces: Effect of Finite-Rate Chemical Reactions

1984 ◽  
Vol 106 (4) ◽  
pp. 713-720 ◽  
Author(s):  
C. H. Chen ◽  
J. S. T’ien
Keyword(s):  
Carbon Monoxide ◽  
Gas Phase ◽  
Chemical Reactions ◽  
Vertical Wall ◽  
Fire Plume ◽  
Gas Phase Reactions ◽  
Finite Rate ◽  
Slowing Down ◽  
Kinetic Rates ◽  
Relative Kinetic

Fire plume along a vertical wall is analyzed using a laminar boundary layer model, including finite-rate, gas-phase chemical kinetics. The chemical reactions include two semiglobal steps: In the first, fuel is oxidized to form carbon monoxide and water vapor, and in the second, carbon monoxide is oxidized to form carbon dioxide. Several important nondimensional kinetic parameters are identified and a parametric study is given. The computed results indicate that by slowing down the relative kinetic rates in the gas-phase reactions, the total surface heat transfer rate and the preheating distance are decreased. Furthermore, slowing down the kinetics also increases the amount of unreacted combustibles that escape from the flame.

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.

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