Speaker
Description
See full abstract here:
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.3015.pdf
Large attention is nowadays devoted to the understanding of the activation of CO_2 by cold plasmas in different conditions (MW, DBD, nano-pulsed discharges). Theoretical efforts are being developed to better understand the electrical conditions necessary for maximizing the CO_2 dissociation process [1-2]. In particular, Bogaerts et al. [1] concentrated their efforts on the vibrational plasma kinetics, while Pietanza et al. [2] devoted particular attention to the development of the electron energy distribution function (eedf) in pure CO_2 and CO plasmas. In this contribution, we present new results for MW CO_2 reacting mixture, emphasizing the role of CO_2 and CO species in affecting the eedf through their non-equilibrium vibrational distributions, as well as their concentration of electronic states. Vibrational and electronic states play an important role in superposing structures in eedf especially in the post-discharge regime due to the action of superelastic collisions. A sample of results is reported in the following figure for discharge (a) and post-discharge (b) conditions characterized by the following values: P=20 torr, Tg=300 K, power density W=80 W/cm^3, discharge time td=50 ms, post-discharge time tpd=800 ms). The role of excited states in affecting eedf is well evident in the postdischarge regime where the plateau created by the CO_2 metastable at 10.5 eV and a multitude of peaks mainly due to the electronic states of CO clearly appear, these structures being hidden under discharge conditions by the applied field.
- T. Kozac, A. Bogaerts, A. Berthelot PSST 23 (2014) 045004; A. Bogaerts J. Phys. Chem. C 121 (2017) 8236
- L.D. Pietanza, G. Colonna, G. D'Ammando, A. Laricchiuta, M. Capitelli Phys. Plasmas 23 (2016) 013515; M. Capitelli, G. Colonna, L.D. Pietanza PSST 26 (2017) 055009; L.D. Pietanza, G. Colonna, M. Capitelli PSST 27 (2018) 095004
