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5.9. RESULTS & DISCUSSION 1022 1021 1020 1019 1018 1017 1016 electron excitation from (000) VT relaxation from (002) electron de-excitation to (000) VT relaxation to (100) Rates (cm3s-1) 60 70 80 90 100 110 120 130 140 150 Time (μs) Figure 5.9: Production and destruction rates of CO2(v31) (001) at d0. Pink line indicates t0 = 77 μ s. Um, it does not necessarily mean that the optimal processes should be at low mean elec- tron energies. As has been seen from figure 5.8a, it requires high electron densities to produce significant densities of CO2(v31). To understand the importance of ne, it is in- structive to resolve the contribution to electron induced production term (keV n0ne) from increase in rate coefficient (if any) and the electron density, especially at d0 and d1. To this effect, the CO2(v31) density, the rate coefficient, the electron density and the Um at d0 are plotted as a function of time for the last three cycles before the voltage is switched off in figure 5.10. To bring about the contrast with other locations in the gas gap, the same variables are also plotted at x=0.09 cm. From the figure 5.10, it can be seen the density of CO2(v31) increases, at both locations, only when the electron density and the rate-coefficient increase simultaneously. However, the rate coefficient changes only by a factor of two (also see figure 5.11) while the electron density changes few orders of mag- nitude. This dependance on the electron density becomes apparent, at instances when there is a filament (eg. at t0). While the rate-coefficient saturates at instances prior to the occurrence of the filament, the density of CO2(v31) actually increases only when the electron density increases. To compare between E8 and E9, the rate coefficients of these reactions are plotted in figure 5.11. The method to calculate these rate coefficients from Boltzmann solver is briefly described in chapter 4 and in detail in references provided therein. Although the rate-coefficient of E9 is always greater than E8, for same electron density ne, the rate of 138 VT relaxation to (110) electron de-excitation from (002) VV transfer to (002)PDF Image | Understanding CO2 containing non-equilibrium plasmas
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