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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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5.9. RESULTS & DISCUSSION a) b) c) two does not have the same influence as that of production of initial states. 1013 1012 1011 1000 mbar 1013 1012 1011 800 mbar 1013 600 mbar 10 15 20 Number of On-cycles 10 15 20 Number of On-cycles 1012 1011 10 15 20 Number of On-cycles Figure 5.14: Rates of CO production from VV transfer alone at various conditions after time period of 20 cycles with different number of cycles voltage-on , at 1000, 800 and 600 mbar Preceding analysis of Φ gives us an important insight that the VV transfer is mainly determined by the rate at which the initial vibrational excitation is created and that it is only weakly influenced by pressure. However, low values of Φ do not mean lower energy efficiency. For example, between 10 voltage on-cycles and 20 on-cycles the power coupled into plasma changes by a factor of two. So unless the gain in Φ is greater than a factor of 2, energy efficiencies do not become better by continuous operation. For the conditions tested here, CO production from VV transfer increases 3-6 times while the energy consumption only increases by a factor of two. It is likely that an optimum can be found between power-consumption and VV transfer, but here the focus of this work has been limited only to estimate maximum Φ and the factors influencing it. During the voltage-on phase CO is produced not only by VV-transfer but also from many other processes namely, electron impact dissociation, dissociative electron attach- ment of CO2 ground state and vibrationally excited states, dissociative recombionation of CO+2 ions. To achieve maximum energy efficiency it is desired that maximum amount of CO produced should be from VV-transfer. In order to check, if VV-transfer contrib- utes significantly, the ratio of CO produced from VV-transfer can be compared with the amount of CO produced from other channels (nCO) β = nCO(V V transfer) (5.15) nCO 144 Φ (cm−3 s−1 )

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