Speaker
Igor Denysenko
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/I4.J501.pdf
Modelling of argon-acetylene dusty plasma
I. B. Denysenko1, E. von Wahl2, S. Labidi3, M. Mikikian3,
H. Kersten2, T. Gibert3, N. A. Azarenkov1
1
School of Physics and Technology, V. N. Karazin Kharkiv National University,
Kharkiv, Ukraine
2
Institut für Experimentelle und Angewandte Physik, Universität Kiel, Kiel, Germany
3
GREMI, UMR 7344 CNRS/Université d’Orléans, F-45067 Orléans, France
The properties of an Ar/C2H2 dusty plasma (the ion, electron and neutral particle densities, the
effective electron temperature and the dust charge) in glow and afterglow regimes are studied
using a volume-averaged model. The model accounts for different loss and production
processes of neutral species and ions in the plasma, including the losses on the dusts,
dissociation and ionization of acetylene molecules in collisions with argon atoms in excited
states as well as the loss of anions in collisions with hydrogen atoms. The most important
processes are determined. The numerical calculations are carried for Maxwellian and
Druyvesteyn electron energy distribution functions (EEDFs). The calculated mass-
distributions of neutral species and positive ions are compared with the mass spectra obtained
in our experiment and found to be in a good qualitative agreement. Effects of variations of the
input power, EEDF and dust particle densities and radii on the plasma properties are
investigated. It is shown that the densities of most hydrocarbon ions are smaller in the plasma
with large dust charge density comparing with the dust-free case, while the argon ion density
is larger in the former case. The ion density differences are found to be due to larger electron
temperature and smaller electron density in the dusty plasma. It is also found that the
acetylene density is larger in the dust-free case as compared with that in the dusty plasma. It is
obtained that dust particles affect essentially the ion densities in the plasma as well as the
density of atomic hydrogen. Numerical calculations also showed that argon atoms in excited
states affect the production of C2H2+, C4H2+, C2H and H as well as the loss of C2H2, C4H2 and
H2. The loss of C2H – anions in the plasma is found to be mainly due to the anions’ collisions
with positive ions and atomic hydrogen. It is also discussed how dust particles affect the
EEDF.
