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: \beo &&\frac{d[{\rm O(^1D)}]/dt}{{\rm [CO_2]_0 \, [Ar]}} \Biggr|_{t \approx 0} \\ &&\quad = 1.23 \times 10^{14} \exp \left( -74810 {\rm K}/T \right){\rm cm^{3} mol^{-1} s^{-1}} \eeo 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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Received 24 January 1995 / Accepted 13 March 1996
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Eremin, A., Woiki, D. & Roth, P. Measurement of O(\(^1\)D) formation during thermal decomposition of CO\(_2\) behind shock waves . Shock Waves 6, 79–83 (1996). https://doi.org/10.1007/s001930050023
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DOI: https://doi.org/10.1007/s001930050023