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• Nonequilibrium Excitation of C2 Radicals during the Thermal Decomposition of C3O2 behind Shock Waves

J. Deppe, A. Emelianov, A. Eremin, G. Friedrichs, V. Shumova, H.Gg. Wagner, and I. Zaslonko
Z. Phys. Chem. 215, 417-425 (2001)

 

C2 concentrations and populations of the ground and the first excited vibrational levels of electronically excited C2(d^3Π) radicals during the thermal decomposition of C3O2 behind shock waves were monitored by emission and absorption measurements in the (0-0) and the (1-0) Swan-bands. Experiments were carried out in mixtures of 1% C3O2 + Ar and 1% C3O2 +He at T = 2100-3200 K and p = 1.5 - 7.5 bar. In the whole range of conditions studied an essential nonequilibrium of electronic and vibrational states of nascent C2 radicals was observed. For analyzing possible formation and consumption reactions of the excited C2 radicals, a convenient kinetic scheme of the C3O2 decomposition was developed, which considers both the recombinative pumping process and exchange and quenching reactions of the C2(d^3Π, v=0,1) states.

 

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