Excited flame temperatures density

Using the frozen excitation model to analyze the data shown in Fig. 3, and calibrating the system via Rayleigh scattering (8J, a total OH number density of 4 x 1C>16 cm 3 was calculated for an assumed flame temperature of 2000 K in the methane-air torch. Nt was not compared directly with the results of absorption studies future flat flame burner studies will involve direct comparison of absorption and fluorescence. 

Coincidentally with the revival of atomic absorption methods, renewed interest in flame processes has arisen among many groups of workers (Bl, F7, G3, M5). Absorption techniques including the line reversal apparatus have contributed significantly to our understanding of atomic activation, excitation, atomic population densities, and temperature gradients. At the present time, Ae flame represents the most convenient means to create an atomic vapor under reproducible conditions. For these reasons, a short discussion of processes taking place in the flame is needed. Other means of production of activated atoms will be mentioned under instrumentation and techniques (Section 4.5). 

Determination of Flame and Plasma Temperatures and Density Profiles by Means of Laser-Excited Fluorescence... 

In equation (26), I/Ip is proportional to the number density of emitting molecules, which, in turn, is proportional to pressure at constant temperature and relative composition (see Section E.5.2) when reabsorption is not negligible, the pressure dependence is weaker. These results were employed in the preceding subsection. In addition, 1/lp varies strongly with position x in the flame because of the changes in the concentrations and degrees of excitation of the emitters. For this reason, the generality of equation (21), which... 

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