Ionızation, Attachment and Positive Synergism in CF3I+CF4+Ar Gas Mixtures with Dilute CF3I Components

Year 2019, Volume: 32 Issue: 1, 175 - 184, 01.03.2019

Suleyman Sungur Tezcan , Mustafa Sezai Dıncer Hıdır Duzkaya

Abstract

The
purpose of the present paper is to evaluate the swarm parameters in CF₃I+CF₄+Ar
ternary gas mixtures with dilute CF₃I components. The swarm
parameters reported are namely, ionization, attachment, effective ionization,
excitation rates and electron mean energies. 
We present the swarm data of the ternary mixture for various CF₄+Ar
base mixtures with dilute CF₃I concentrations and analyze positive
synergism in terms of attachment, ionization and excitation rates in the E/N
range of 50–700 Td (1 Td = 10-21 Vm2).  In the ternary mixture, Ar component of the
ternary mixture is kept constant at concentrations in the range of 40% - 90%
and the CF₃I component is increased from 0.5% to 55%. In the dilute
CF₃I mixtures, there is a marked increase in the electronegativity
together with increased total excitation rates while the CF₃I
component is increased. The mean energy of electrons is also reduced with
increasing CF₃I content at given E/N accordingly. The limiting E/N
values are obtained at the E/N values where the rate of ionization is equal to
the rate of attachment. The limiting E/N increases in the ternary mixture as
the CF₃I ratio is increased in the present study. The synergism is
calculated using the Boltzmann solution results of the limiting E/N fields.
Positive synergism is observed within the parameter range of this study. The
degree of synergy is very high with dilute CF₃I components.

Keywords

Gas discharges, Trifluoromethyliodinecation (CF3I), Tetraflorometan (CF4), Argon, Electron swarm parameters

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