Abstract
For the UV OH band at 306.357 nm (transition A2Σ, ν = 0→X2Π, ν' = 0) that is frequently observed in hotgases containing oxygen and hydrogen (flames, arc plasmas), a verysensitive variation of two groups of unresolved rotational lines as afunction of the temperature has been found. Using a numerical simulation,this variation has been calibrated as a function of the temperature and ofthe optical apparatus function. This calibration allows us to easilydetermine the rotational temperature without computing any lineintensity.
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