scholarly journals Interstellar Molecule Formation; Radiative Association and Exchange Reactions

1971 ◽  
Vol 2 ◽  
pp. 421-428 ◽  
Author(s):  
William Klemperer
Keyword(s):  
Gas Phase ◽  
Interstellar Dust ◽  
Present Report ◽  
Exchange Reactions ◽  
Gas Phase Reactions ◽  
Interstellar Molecule ◽  
Molecule Formation ◽  
Radiative Association ◽  
Made In

The present report is a summary of a study, made in collaboration with P. Solomon, on the formation of interstellar molecules by radiative association and chemical reactions. The model to be discussed is limited practically to gas phase reactions in an HI region, where the principal constituents are atomic. It therefore is limited in scope and applicability. The role of the interstellar dust in this model is passive. It shields the region from radiation. Since a number of molecular species are dissociated by radiation and the extent of carbon ionization is determined by radiation, the radiation density is important in determining compositional equilibria.

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.

Gas-phase reactions of anions with halogenated methanes at 297 ± 2 K

1976 ◽  
Vol 54 (10) ◽  
pp. 1643-1659 ◽  
Author(s):  
K. Tanaka ◽  
G. I. Mackay ◽  
J. D. Payzant ◽  
D. K. Bohme
Keyword(s):  
Gas Phase ◽  
Rate Constants ◽  
Hydrogen Atom Transfer ◽  
Gas Phase Reactions ◽  
Phase Measurements ◽  
Displacement Reactions ◽  
Nucleophilic Reactivity ◽  
Apparent Activation Energies

The rate constants for a number of exothermic displacement (SN2) reactions of the type X− + CH3Y → Y− + CH3X where X− = H−, O−, C−, F−, S−, Cl−, OH−, C2−, CN−, SH−, S2−, C2H−, NH2−, NO2−, CHF−, CH2Cl−, CH2Br−, CH3O−, CH3S−, and CH3NH− and Y = F, Cl, and Br, have been measured in the gas phase at 297 ± 2 K using the flowing after-glow technique. These gas-phase measurements provided an opportunity to determine the intrinsic nucleophilic reactivity of 'nude' anions and hence to assess the role of solvation in the kinetics of SN2 reactions proceeding in solution. Comparisons of the experimental rate constants with rate constants calculated using classical theories of capture indicate that several displacement reactions may possess large intrinsic energies of activation, [Formula: see text]. Correlations were found between apparent activation energies and the heats of reaction. These correlations provided a convenient classification of the various anion nucleophiles. Displacement was observed to compete with proton transfer in reactions involving nucleophiles of high intrinsic basicity and with hydrogen atom transfer and H2+ transfer in the reactions of the O− radical anion.

Epitaxial Si1−yCy alloys: The role of surface and gas phase reactions

1999 ◽  
Vol 85 (2) ◽  
pp. 1240-1242 ◽  
Author(s):  
A. C. Mocuta ◽  
D. W. Greve
Keyword(s):  
Gas Phase ◽  
Gas Phase Reactions
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