Atomic Processes and Diagnostics of Low Pressure Krypton Plasma

Optical emission spectroscopy along with suitable collisional-radiative (CR) model is used in plasma diagnostics. Importance of reliable cross-sections for various atomic processes is shown for low pressure argon plasma [1-2]. In the present work, radially-averaged Kr emission lines from the 2$p_{i} \to $1$s_{j}$ were recorded as a function of pressure from 1 to 50mTorr. We have developed a CR model using our fine-structure relativistic-distorted wave cross sections [3]. The various processes considered are electron-impact excitation, ionization and their reverse processes. The required rate coefficients have been calculated from these cross-sections assuming Maxwellian energy distribution. Electron temperature obtained from the CR model is found to be in good agreement with the probe measurements.\\[4pt] [1] R. K. Gangwar, L. Sharma, R. Srivastava and A. D. Stauffer, \textit{J. of Appl. Phys. }111, 053307 (2012)\\[0pt] [2] Dipti, R. K. Gangwar, R. Srivastava and A. D. Stauffer, Eur. Phys. J. D, 2013, \textbf{67}, 40244.\\[0pt] [3] R. K. Gangwar, L. Sharma, R. Srivastava, and A. D. Stauffer, Phys. Rev. A, 2010, \textbf{82}, 032710.