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5.9. RESULTS & DISCUSSION ferred to CO2(v31). The result is a direct consequence of smaller cross-sections of elec- tron impact excitation of CO2(v32) by electrons when compared with that of CO2(v31). This smaller transfer of electron energy into higher asymmetric vibrational modes gives confidence that neglecting the direct electron impact excitation of even higher vibrational states from the ground state does not effect the results. It has to be noted that fractional power transferred plotted here is general and is valid for plasmas where ionization de- grees are not too high. E/N (Td) 20 48 104 199 346 537 10 1 10 0 10 −1 10 −2 10 CO (010) 2 CO (100) 2 CO (020) 2 CO (001) 2 CO (002) 2 CO (3Σ+) 2u CO (1Σ+) 2u Dissociation + 2 + CO (A) 2 + CO (B) 2 Momentum transfer Attachment CO 0.024 1 2 3 4 5 6 7 8 9 10 Mean energy (eV) Figure 5.6: Fractional power transferred into each of the important channel con- sidered. Not all the vibrational channels are shown. 5.9.1 Discharge Characteristics The fractional power transferred presents a static picture at fixed mean electron energies. For dynamics when Um is continuously varying however, discharge characteristics are more useful especially in assessing characteristic time scales of various processes and their spatial distribution – for example, electron density evolution. Hence, like in chapter 4, discharge characteristics of the standard condition are plotted in the figure 5.7. The initial conditions considered in this study are exactly same as the one in chapter 4. It includes discharge current, gap voltage and applied voltage as a function of time, and spatio-temporal evoltion of electron density, mean electron energy and reduced electric field. The major difference between this figure and the one plotted in chapter 4 is that the voltage is switched off after 10 cycles, so as to compare between the role of electron induced processes and the role of heavy reactions alone. In a steady state operation of a DBD plasma, discharge characteristics are peri- odic (henceforth called periodic state); therefore only last 2 cycles before the voltage 133 Fraction of transferred power (%)PDF Image | Understanding CO2 containing non-equilibrium plasmas
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