Simulation of the OH Emission Molecular Spectrum to Determine the Plasma Temperature and the Influence Noise to Signal Ratio on the Temperature Values

The OH system (A$^2\Sigma^+$ - X$^2\Pi_{\rm{I}}$) molecular emission spectrum is frequently observed in plasma sources containing water. We have simulated the spectrum of (0,0) and (1,1) bands of this system from 3064 {\AA} for different rotational and vibrational temperatures. The influence of the noise to signal ratio has been studied, if the noise to signal ratio is about 10\% we found an error of 6\% at temperature 3000K and 10\% at 6000K.