Temperature, Kinetic Energy, and Internal Energy Dependences of the Rate Constant and Branching Fraction for the Reaction of O(+) (4S) with CO2
Abstract
Rate constants and branching fractions were measured for the reaction of O (+) (4S) with CO sub 2 as a function of average ion-neutral center-of-mass kinetic energy (<KE(+) cm>) at several temperatures. The reaction produces both O sub 2 and CO(+) sub 2 as product ions. The total rate constants were found to be nearly collisional at low <KE sub cm> and to decrease slightly at higher <KE sub cm>. No temperature dependence of the rate constants was found at any given <KE sub cm>, indicating that neither CO sub 2 rotational excitation nor CO sub 2 bending mode excitation has much effect on the overall reactivity. In contrast, the branching fraction for the endothermic charge transfer channel leading to CO(+) sub 2 was found to increase with increasing <KE sub cm> and also to increase with temperature at fixed <KE sub cm>. Analysis of the data indicates that the branching fraction depends on the total energy in the system (electronic, kinetic, rotational, and vibrational).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1992
- Accession Number
- ADA248041
Entities
People
- Albert A Viggiano
- Jane M. Van Doren
- John F. Paulson
- Robert A. Morris
Organizations
- Phillips Laboratory