The effect of the dipole‐induced dipole potential on ion–polar molecule collision rate constants

1992 ◽  
Vol 96 (7) ◽  
pp. 5550-5551 ◽  
Author(s):  
Timothy Su ◽  
A. A. Viggiano ◽  
John F. Paulson
Keyword(s):  
Rate Constants ◽  
Polar Molecule ◽  
Collision Rate ◽  
Dipole Potential ◽  
Induced Dipole

ICR Study of Nonreactive Collision Rate Constants

1972 ◽  
Vol 57 (9) ◽  
pp. 4049-4050 ◽  
Author(s):  
P. P. Dymerski ◽  
R. C. Dunbar
Keyword(s):  
Rate Constants ◽  
Collision Rate

Analytic solution of relaxation and dissociation of ozone and sulphur dioxide at low pressures

1981 ◽  
Vol 59 (17) ◽  
pp. 2569-2574 ◽  
Author(s):  
Wendell Forst
Keyword(s):  
Rate Constants ◽  
Sulphur Dioxide ◽  
Vibrational Relaxation ◽  
Analytic Solution ◽  
Thermal Dissociation ◽  
Relaxation Times ◽  
Average Energy ◽  
Collision Rate ◽  
Low Pressures ◽  
Good Agreement

The analytic solution of vibrational relaxation in a low-pressure gas is applied to the thermal dissociation of O3 in helium and of SO2 in argon. Use is made of experimental relaxation times to obtain average energy lost per collision. Calculated weak-collision rate constants are in very good agreement with experiment in the case of SO2, but only in fair agreement in the case of ozone. Several curious aspects of the ozone system, both experimental and theoretical, are discussed.

Ion–molecule reactions in formic-d acid and methyl formate

1968 ◽  
Vol 46 (12) ◽  
pp. 2141-2146 ◽  
Author(s):  
Howard Pritchard ◽  
J. C. J. Thynne ◽  
A. G. Harrison
Keyword(s):  
Rate Constants ◽  
Methyl Formate ◽  
Ion Molecule Reactions ◽  
Dipole Interactions ◽  
Induced Dipole ◽  
Energy Formula ◽  
Good Agreement

The following ion–molecules reactions have been found to occur in DCOOH for ions produced by bombardment with electrons of 10–15 eV energy (all rate constants in cm3 molecule−1 units).[Formula: see text]In methyl formate the following reactions have been identified and rate constants measured for ions formed by bombardment with electrons of 10–15 eV energy.[Formula: see text]Experiments using DCO2CH3 show that reaction [f] involves transfer of the methyl hydrogen at a rate 1.5 times that of the formyl hydrogen while reaction [g] involves transfer from only the methyl position of CH3OH+. The rate constants for all reactions are considerably higher than predicted on the basis of ion–induced dipole interactions only but are in good agreement with values calculated by including ion–dipole interactions.

Collisional Deactivation Rates of Electronically Excited Molecular Ions. II

1972 ◽  
Vol 50 (1) ◽  
pp. 1-7 ◽  
Author(s):  
G. I. Mackay ◽  
R. E. March
Keyword(s):  
Rate Constants ◽  
Radiative Lifetime ◽  
Molecular Ions ◽  
Deactivation Rate ◽  
Complete Knowledge ◽  
Induced Dipole ◽  
Excited Species ◽  
Vibrational Levels ◽  
Electronically Excited ◽  
Deactivation Rate Constant

Total deactivation rate constants have been determined for N2+(B2Σu+) and the (A2Πu) and (B2Σu+) states of CO2+ with a number of quenchers. The energy specific total deactivation rate constant is compared to the total radiative lifetime of the excited species. A particular novelty of the technique is that it does not require a complete knowledge of the formation modes for the excited species. The results are compared with theoretical values obtained from the ion-induced dipole model. Individual deactivation rate constants are presented for N2+(B2Σu+) ions in the v = 0, 1, and 2 vibrational levels quenched by N2, O2, H2, and CO2; and for the(A2Πu) and (B2Σu+) states of CO2+ quenched byCO2, N2, O2, NO, and H2. Charge transfer is the most probable mode of deactivation except in the CO2+–H2 reactions where H-atom abstraction is more probable.

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