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Abstract
The spectroscopic analysis of the high molecular weight species condensed (CS) and sampled in the soot formation zone of a rich premixed ethylene flame was carried out in the uv-visible and infrared wavelength region.
The absorptivilies of the aromatic and tar fractions of CS, expressed in terms of oscillator strength in the 215-400nm wavelength region, showed a maximum of the absorptivity in correspondence of soot inception.
Aromatic and tar species showed both aliphatic and aromatic characteristics by means of FT-IR analysis in the 2700-3400 cm−1 region where the aliphatic and aromatic C-H stretch is detected, A quantitative FT-IR method was developed allowing the determination of the relative contribution of the aliphatic and aromatic hydrogen to the total hydrogen of the condensed species.
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