69th Annual Gaseous Electronics Conference
Volume 61, Number 9
Monday–Friday, October 10–14, 2016;
Bochum, Germany
Session UF2: Chemical Modeling
8:30 AM–10:30 AM,
Friday, October 14, 2016
Room: 2a
Chair: Miles Turner, Doublin City University
Abstract ID: BAPS.2016.GEC.UF2.6
Abstract: UF2.00006 : Selfconsistent vibrational and free electron kinetics for CO$_{\mathrm{2}}$ dissociation in cold plasmas
10:00 AM–10:30 AM
Preview Abstract
Abstract
Author:
Mario Capitelli
(CNR NANOTEC_Plasmi Lab (Bari, Italy))
The activation of CO$_{\mathrm{2}}$ by cold plasmas is receiving new
theoretical interest thanks to two European groups [1-2]. The Bogaerts group
developed a global model for the activation of CO$_{\mathrm{2\thinspace
}}$trying to reproduce the experimental values for DBD and microwave
discharges. The approach of Pietanza et al was devoted to understand the
dependence of electron energy distribution function (eedf) of pure
CO$_{\mathrm{2}}$ on the presence of concentrations of electronically and
vibrationally excited states taken as parameter. To understand the
importance of the vibrational excitation in the dissociation process
Pietanza et al compared an upper limit to the dissociation process from a
pure vibrational mechanism (PVM) with the corresponding electron impact
dissociation rate, the prevalence of the two models depending on the reduced
electric field and on the choice of the electron molecule cross section
database [2].
Improvement of the Pietanza et al model is being considered [3] by coupling
the time dependent Boltzmann solver with the non equilibrium vibrational
kinetics of asymmetric mode and with simplified plasma chemistry kinetics
describing the ionization/recombination process and the
excitation-deexcitation of a metastable level at 10.5eV. A new PVM mechanism
is also considered. Preliminary results [3], for both discharge and post
discharge conditions, emphasize the action of superelastic collisions
involving both vibrationally and electronically excited states in affecting
the eedf. The new results can be used to plan a road map for future
developments of numerical codes for rationalizing existing experimental
values, as well as, for indicating new experimental situations.
[1] T.Kozak, A.Bogaerts Plasma Sources Sci. Technol. 24, 042002 (2015);
[2] L. D. Pietanza, G. Colonna, G. D'Ammando, A. Laricchiuta and M.
Capitelli, Plasma Sources Sci. Technol. (Fast Track Communication) 24,
042002 (2015); J.Phys.Chem.A 120, 2614(2016);
[3] L. D. Pietanza et al. Plasma Phys. Control. Fusion (2016) submitted
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2016.GEC.UF2.6