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

Authors : Suleyman Sungur Tezcan, Mustafa Sezai Dincer, Hıdır Duzkaya

Pages : 175-184

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Publication Date : 2019-03-01

Article Type : Research

Abstract :The purpose of the present paper is to evaluate the swarm parameters in CF 3 I+CF 4 +Ar ternary gas mixtures with dilute CF 3 I 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 CF 4 +Ar base mixtures with dilute CF 3 I 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 Vm 2 ).   In the ternary mixture, Ar component of the ternary mixture is kept constant at concentrations in the range of 40% - 90% and the CF 3 I component is increased from 0.5% to 55%. In the dilute CF 3 I mixtures, there is a marked increase in the electronegativity together with increased total excitation rates while the CF 3 I component is increased. The mean energy of electrons is also reduced with increasing CF 3 I 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 CF 3 I 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 CF 3 I components.
Keywords : Gas discharges, Trifluoromethyliodinecation (CF3I), Tetraflorometan (CF4), Argon, Electron swarm parameters