Accession Number:

ADA248041

Title:

Temperature, Kinetic Energy, and Internal Energy Dependences of the Rate Constant and Branching Fraction for the Reaction of O(+) (4S) with CO2

Descriptive Note:

Corporate Author:

PHILLIPS LAB HANSCOM AFB MA

Report Date:

1992-01-01

Pagination or Media Count:

6.0

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.

Subject Categories:

  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE