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Understanding CO2 containing non-equilibrium plasmas

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Understanding CO2 containing non-equilibrium plasmas ( understanding-co2-containing-non-equilibrium-plasmas )

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5.7. DESCRIPTION OF THE REACTION KINETICS Dissociation lim it asym m etric sym m etic bent com bined sym m etric 20 19 18 3 2 1 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 123 Figure 5.4: Energy levels of CO2 that are included in the model. The combined symmetric mode are the vibrational levels that are combination bands involving symmetric stretch mode and bending mode. ν1, ν2, ν3 represent the symmetric stretch, bending and asymmetric stretch mode, respectively. levels. Although the species that are considered important for CO2 dissociation are vi- brational levels in asymmetric mode, symmetric modes (ν = 1, 2) are also included as they play important role in determining energy input especially at lower Um. A detailed discussion on the method to calculate rate-coefficients of these processes is given in chapter 4 and few important remarks on cross-sections used are made in the part I of this chapter. As mentioned already, the cross-sections for the excitation from the ground level to (CO2(v32) are obtained from Allan [178]; this is one of the main differences between the model here and other models. The interaction of electrons with even higher levels of asymmetric mode (CO2(v33)–CO2(v320)) is not considered; the reason for neglecting the interaction is due to very small cross-sections and, more importantly, to establish an upper-limit on CO2 dissociation from VV transfer alone. In plasmas, electron impact de-excitation is an important process that prevents ac- cumulation of energy in vibrational levels [237]. To calculate the rate coefficients of electron induced de-excitation of the excited species, the principle of detailed balancing 127 Vibrational energy (eV)

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