A spectral analysis of the light extinction of near-sooting premixed benzene/air flames at atmospheric pressure has been performed betwene 200 and 700 nm, together with UV laser-excited fluorescence and light scattering. The absorptionspectra, attributed to high molecular mass structures, are interpreted in the flamework of the optical properties of solid state matter, according to the Tauc band-gap model. This is a powerful approach to characterize carbonaceous material; in fact, theoretical computaitons on carbon structures containing conjugated pi bonds indicate that the extension of aromatic clusters or islands inside the structures can be obtained from the measured optical band-gap energies.
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