Collisional radiative model for Ar/O2 plasma with reliable fine structure resolved cross sections .

A collisional radiative (CR) model has been developed for Ar/O$_{\mathrm{2}}$ mixture plasma. Here we extend our previous CR model for pure Ar plasma [1] by including the quenching of the excited Ar atoms with O$_{\mathrm{2\thinspace }}$along with the other processes \textit{viz.} radiative population transfer, electron impact excitation and ionization. Since electron collision processes play vital role, a complete data set obtained using relativistic distorted wave theory is used. Present work is in the light of recent measurement [2] on Ar/O$_{\mathrm{2}}$(0-5{\%}) mixture plasma at 2 Torr pressure. Diagnostics have been done by optimizing the normalized intensities obtained from this model with the measured intensities [2] for different transitions between fine stricture levels. The population densities of fine structure states of Ar(1s) are obtained and compared with the measurements [2] at different O$_{\mathrm{2}}$ fractions. The electron temperature is found to increase (0.9 to 1.8eV) with O2 fraction (0-5{\%}). \begin{enumerate} \item Dipti \textit{et. al.,} \textit{Eur. Phys. J. D} \textbf{67} 203, 2013 \item Jogi \textit{et. al,} \textit{J. Phys. D: Appl. Phys.} \textbf{47} 335206,2014. \end{enumerate}