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5.9. RESULTS & DISCUSSION T i m e ( μs ) 41 .99.59 5 34 49 ..99 55 67 49 ..99 55 91 40 .99.59 5 11 23 49 ..99 55 1014 1012 1010 108 106 Figure 5.13: Vibrational distributions at different times. The voltage is switched off after 10 cycles. The total simulation time is 20 cycles at 130 kHz or 0.153 ms. the rates of dissociation from VV transfer can be calculated as function of pressure and tplasma. The spontaneous dissociation can be simulated by assuming that a collision of every CO2(v320) with ground state CO2(v0) will result in dissociation (e.g. A rate coeffi- cient of 10−8 cm3s−1). In reality however the rate should also take into account the speed of inter-system crossing between the ground electronic state and 1B2 state (see section 5.4 in part I). Since 20 cycles were used, the rate of CO production (Φ) in cm−3s−1 will be Φ = nCO2(v320) (5.14) 154 × 10−6 In figure 5.14, Φ is plotted for different conditions. From this figure it becomes apparent that at any pressure, the maximum production rate can be achieved with 20 on-cycles and that it decreases as we decrease the number of on-cycles. For the same number of on-cycles, Φ decreases with pressure. From these trends it can be said that the electronic excitation of initial states, which increases with pressure and with on-cycles is the ma- jor determining factor in VV transfer (see figure 5.12). Since in (quasi-)periodic state, number of initial states created per cycle is in similar range, the total number of initial states created changes by a factor of two when the on-cycles is changed from 10 to 20. However, the attendant increase in Φ is more than 3 times. Changing pressure on the other hand affects the VT relaxation included in the model, which should decrease the number density of highly excited levels. But changing the pressure by almost factor of 2468101214161820 ν3 143 Density(cm-3) TimePDF Image | Understanding CO2 containing non-equilibrium plasmas
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