The influence of the gas mixing ratio on some characteristics and reaction rate coefficients of Ar/N2 and He/N2 DC plasma | ||
| Arab Journal of Nuclear Sciences and Applications | ||
| Article 22, Volume 52, Issue 2, April 2019, Pages 181-186 PDF (637.68 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ajnsa.2019.4970.1115 | ||
| Authors | ||
| Naglaa Mohammed El-Sayed* 1; omar farag farag2 | ||
| 1Faculty of Science, Zagazig University, Egypt | ||
| 2Zagazig University, Faculty of Science, Physics Department, Zagazig, Egypt | ||
| Abstract | ||
| The aim of this paper is to analyze the relation between the reaction rate coefficients, hence the production of active species, and the gas mixing ratio in a comparative way between Ar/N2 and He/N2 gaseous mixtures. The Ar and He contributions were from 0 to 100 % at total gas pressure of 0.4 Torr and reduced electric field E/N of 610 Td. Langmuir probe is employed to measure electron temperature. The results showed that, adding Ar to N2 plasma reduced both the discharge operating voltage and the electron temperature. However an opposite action is obtained on Adding He. Also, Ar can induce the dissociation of molecular nitrogen and increase the production of nitrogen atoms however; it has insignificant effect on the nitrogen ionization mechanism. On the other hand He addition enhances the production of N_2^+, N+ and N-atoms through ionization, ionization dissociation and dissociative reaction however it has a decreasing effect on the dissociative recombination mechanism. | ||
| Keywords | ||
| DC plasma; ionization; dissociation; Rate coefficients | ||
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