CALCULATION OF A GLOBAL RATE COEFFICIENT FOR CO2 DISSOCIATION AND ATOM IONIZATION: APPLICATION TO ATMOSPHERIC MARTIAN ENTRIES

摘要

A detailed kinetic model using a state-to-state approachis developed in order to calculate global rate coefficientsfor two important processes involved in the atmosphericMartian entries chemistry: dissociation/recombination ofCarbon dioxide and ionization/recombination of AtomicCarbon. The behavior of the species involved is governedby the general balance equation including forward andbackward elementary processes whose rate coefficientsare in part based on experimental data. Extrapolationmethods are used when necessary. During the populationdensities time-evolution, a quasi steady state can beidentified: a global rate coefficient can be derived onlyduring this state. The rates therefore obtained are fittedunder a modified Arrhenius law and some of them arefinally compared with experimental results.