Electron temperature analysis of two-gas-species inductively coupled plasma

The electron energy distribution functions and electron temperatures are measured in Ar/He and Ar/Xe inductively coupled plasma with various mixing ratios. The electron temperature does not change linearly with the mixing ratios; instead it increases abruptly near PHe/PAr+He=1 and decreases rapidly near PXe/PAr+Xe=0. A simple model using a two-ion-species fluid model is suggested to explain the electron temperature variations, and it agrees well with the experimental results.