Anisotropy collision effect on ion transport in cold gas discharges with Monte Carlo simulation
- Universite Paul Sabatier, Toulouse (France)
Ion-molecule collision cross sections and transport and reaction coefficients are one of the basic data needed for discharge modelling of non thermal cold plasmas. In the literature, numerous methods are devoted to the experimental and theoretical determination of these basic data. However, data on ion-molecule collision cross sections are very sparse and in certain case practically not existent for low and intermediate ion energy range. So, the aim of this communication is to give, in the case of two ions in their parent gases (N{sub 2}{sup +}/N{sub 2} and O{sub 2}{sup +}/O{sub 2}), the set of collision cross sections involving momentum transfer, symmetric charge transfer and also inelastic (vibration and ionisation) cross sections. The differential collision cross section is also given in order to take into account the strong anisotropy effect of elastic collisions of ions which are scattered mainly in the forward direction at the intermediate energy range. The differential cross sections are full calculated from interaction potential of polarization at low energy range and potentials of Lennard-Jones for N{sub 2}{sup +}/N{sub 2} and a modified form for O{sub 2}{sup +}/O{sub 2} at upper energy and then, by using a swarm unfolding technique, they are fitted until to obtain the best agreement between the transport and reaction coefficients measured from classical swarm experiments and calculated from Monte Carlo simulation of ion transport for a large range of reduced electric field E/N.
- OSTI ID:
- 212793
- Report Number(s):
- CONF-950749--
- Country of Publication:
- United States
- Language:
- English
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