Kinetics of CO+ and CO2+ with N and O atoms
We have measured reaction rate constants for CO+ and CO2+ reacting with N and O atoms using a selected ion flow tube apparatus equipped with a microwave discharge atom source. Experimental work was supplemented by molecular structure calculations. Calculated pathways show the sensitivity of kinetic barriers to theoretical methods and imply that high-level ab initio methods are required for accurate energetics. We report room-temperature rate constants of 1.0 ± 0.4 × 10-11 cm3 s-1 and 4.0 ± 1.6 × 10-11 cm3 s-1 for the reactions of CO+ with N and O atoms, respectively, and 8.0 ± 3.0 × 10-12 cm3 s-1 and 2.0 ± 0.8 × 10-11 cm3 s-1 for the reactions of CO2+ with N and O atoms, respectively. The reaction of CO2+ + O is observed to yield O2+ exclusively. These values help resolve discrepancies in the literature and are important for modeling of the Martian atmosphere.
Journal of Chemical Physics
Digital Object Identifier (DOI)
Tenewitz, J.E., Le, T., Martinez, O., Ard, S.G., Shuman, N.S., Sanchez, J.C., Viggiano, A.A., Melko, J.J. (2018) Kinetics of CO+ and CO2+ with N and O atoms. Journal of Chemical Physics, 148(8), 084305. https://doi.org/10.1063/1.5011195