Spatially resolved temperature profiles and profiles of major and minor species in CH4/O2/Ar and C2H2/O2/Ar low-pressure flames are needed to better understand the chemistry occurring in these flames. In this paper, we report on temperature measurements obtained by coated Pt/ Pt-Rh(10%) thermocouples and by OH laser- induced fluorescence (LIF) rotational spectroscopy via its (A2Σ+ - X2Π) (1, 0) band. The LIF spectra are fitted by a multivariable computer program to a Boltzmann distribution, and a rotational temperature is abstracted. Species profiles of OH, O, H, CH3, HCO, and CO are experimentally obtained by LIF or resonance-enhanced muitiphoton ionization (REMPI) and are compared to detailed chemical-flame models.

© 1991 Optical Society of America

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