Ion-molecule reaction rate studies in a flowing afterglow system

1970 ◽  
Vol 66 ◽  
pp. 1411 ◽  
Author(s):  
A. L. Farragher
Keyword(s):  
Reaction Rate ◽  
Flowing Afterglow ◽  
Molecule Reaction

Flow‐drift technique for ion mobility and ion‐molecule reaction rate constant measurements. III. Negative ion reactions of O− with CO, NO, H2, and D2

1973 ◽  
Vol 59 (12) ◽  
pp. 6629-6635 ◽  
Author(s):  
M. McFarland ◽  
D. L. Albritton ◽  
F. C. Fehsenfeld ◽  
E. E. Ferguson ◽  
A. L. Schmeltekopf
Keyword(s):  
Rate Constant ◽  
Ion Mobility ◽  
Reaction Rate ◽  
Reaction Rate Constant ◽  
Negative Ion ◽  
Molecule Reaction

The Influence Of Matter And Black-Body Radiation Photons On The Dipole Polarizabilities A And γ Of Atoms

1996 ◽  
Vol 51 (7) ◽  
pp. 805-808 ◽  
Author(s):  
Uwe Hohm
Keyword(s):  
Reaction Rate ◽  
Black Body ◽  
Black Body Radiation ◽  
Rare Gas ◽  
Dipole Polarizability ◽  
Rare Gases ◽  
Reaction Rate Constants ◽  
Molecule Reaction ◽  
Rare Gas Atoms ◽  
Linear Dipole

Abstract The influence of the surroundings on the linear dipole polarizability α and second hyperpo-larizability γ is discussed in terms of the density ϱM of isotropically distributed matter as well as the density ϱp of thermal black-body radiation photons, α and γ of the rare gas atoms are studied as examples. At standard conditions, both effects are of comparable size for the rare gases. Possible consequences for ion-molecule reaction rate constants in astronomical environments are suggested.

scholarly journals Ion-Molecule Reaction Studies below 80 K by the CRESU Technique

1987 ◽  
Vol 120 ◽  
pp. 19-23
Author(s):  
J. B. Marquette ◽  
B. R. Rowe ◽  
G. Dupeyrat ◽  
G. Poissant
Keyword(s):  
Low Temperatures ◽  
Reaction Rate ◽  
Thermal Conditions ◽  
Polar Molecule ◽  
Rate Coefficients ◽  
Third Body ◽  
Basic Principles ◽  
Molecule Reaction

The basic principles of the CRESU technique (Cinétique de Réactions en Ecoulement Supersonique Uniforme) are presented. This technique allows ion-molecule reaction rate coefficients under true thermal conditions at interstellar temperatures. Various behaviors of both third-body association and binary reactions with temperature have been observed, including ion-polar molecule reactions whose rate coefficients sharply increase at very low temperatures.

The Pressure Dependance of Ion-Molecule Reaction Rate Coefficients: CH3+ + HCN/He

1985 ◽  
Vol 38 (2) ◽  
pp. 231 ◽  
Author(s):  
RG Gilbert ◽  
MJ McEwan
Keyword(s):  
Reaction Rate ◽  
Rate Coefficients ◽  
Molecule Reaction ◽  
Ion Molecule Reactions ◽  
Methyl Isocyanide ◽  
Microscopic Reaction ◽  
Energy Dependent ◽  
Collisional Energy Transfer ◽  
Activated Complex ◽  
Transfer Probability

Illustrative calculations are presented on the application to termolecular ion-molecule reactions of methods recently developed for the study of fall-off effects in neutral thermal unimolecular reactions. The energy-dependent microscopic reaction rate, k(E), is obtained from RRKM theory with activated complex parameters first estimated by using ab initio and spectroscopic data and then refined to yield the appropriate pressure-saturated rate. The collisional energy transfer probability distribution function, P(E,E′), is obtained by fitting the fall-off data, guided by information from trajectory calculations. Overall rate coefficients are computed from accurate solutions to the appropriate integral master equation. The illustrative calculations are for the CH3+ + HCN+He → C2H4N+ +He system. It is shown that pressure-dependent data for ion-molecule systems can yield reliable information on P(E,E′). Collisions with the bath gas (He) are comparatively weak, with the average downward energy transferred per collision being c. 8 kJ mol-1. The product of the reaction before any isomerization can occur is shown to be protonated methyl isocyanide , H3CNCH+.

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