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portance of such effects not only in dissociation, but also in altering the EEDF has been discussed elaborately in [198]; however, only a limited number of vibrational levels are included in their model. In this context the main goals of the chapter are: • First, to determine the limiting and favorable conditions for electron excitation of the initial quanta of asymmetric mode; the basis for exclusively considering only asymmetric mode has been discussed in the preceding part. • Second, estimate an upper bound for dissociation by VV transfer in a DBD. In order to achieve these goals every vibrationally excited molecule is considered as an independent chemical species and a state-to-state approach is used to calculate their dens- ities as a function of space and time. Populations of some of the species are mainly mod- ulated by electron induced processes and the rate coefficients of these reactions depend on mean electron energy Um; for this purpose the fluid model simultaneously calculates Um (see chapter 4 for details). The aforementioned goals are better illustrated with an example considered here. Assume that there are 20 CO2 molecules (see section 5.4.1 of part I) which are all excited in their first level of asymmetric mode. In an ideal scenario, every collision of vibrational excited molecule induces a change in vibrational quantum number that is in the right direction to promote dissociation. Hence among these twenty molecules, assuming only one test molecule collides with every other molecule and with each collision it is excited to the next level while the partner is de-excited to ground level. CO2(0,0,i) + CO2(0,0,1) −→ CO2(0,0,i + 1) + CO2(0,0,0) (R1) In this idealized system the energy consumed to prepare the system in initial state Ei, is Ei =20×.291eV = 5.82 eV (5.5) In nineteen collisions, the test molecule will be excited to the dissociation energy and, hence, dissociates. CO2(0, 0, 20) −→ CO + O (R2) For highest energy efficiency, the O radical released in reaction R2 is required to disso- ciate another CO2 molecule by reaction CO2 +O−→CO+O2 (R3) 124 5.6. INTRODUCTIONPDF Image | Understanding CO2 containing non-equilibrium plasmas
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