Abstract

Atomic Resonance Absorption Spectroscopy (ARAS) was applied to measure the time dependent concentration of electronically excited O(\(^1\)D)-atoms during the thermal decomposition of CO\(_2\) behind reflected shock waves. The experiments were performed in the temperature range 4102 K \( \le \) T \( \le \) 6375 K at pressures 0.2 to 1.9 bar with initial gas mixtures of 100 to 1000 ppm CO\(_2\) diluted in Ar. The measured O(\(^1\)D)-formation rate at early reaction times divided by the initial reactant concentrations was found to obey the Arrhenius law: \(\) The assumption of a fast thermalisation between the O(\(^3\)P) and O(\(^1\)D) states is in agreement with previous measurements of the O(\(^3\)P) formation during the thermal decomposition of CO\(_2\), see Burmeister and Roth (1990).

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