Experimental Evidence for Anomalous Population Temperatures of OH in Flames

It is the purpose of this note to present an evaluation of the evidence for and against "anomalous" temperatures OH in flames. Experimental studies have been carried out low pressure flames, and on flames burning at atmospheric . The results have usually been interpreted by using which are applicable only to isothermal systems. Attempts correct for self-absorption have been made by using methods. For spectral lines with Doppler contour has been demonstrated by quantitative calculations that the methods do not correct for self-absorption unless -absorption is weak. In particular, Shuler's method, without for the effect of frequency on intensity, has been shown yield nonlinear plots for strong self-absorption and to be to conventional procedures in the absence of self-absorption. studies on the effect of self-absorption in falsifying data have been carried out by Cowan and Dieke. have recently attempted to estimate absolute emission intensities OH in low pressure flames by using data obtained Oldenberg and Rieke.