Since the generation and IR spectral detection of C<sub>60</sub> in laboratory-produced carbon soot a few years ago, the constituents of the raw fullerene soot have been intensely investigated. The soot, which is prepared by vaporization of graphite with resistive heating under an inert gas, typically contains <20% fullerene by mass. With the recent interest in the reactivity of both the raw soot and purified fullerene products, new techniques are needed which can quickly identify changes in composition of these materials. Diffuse reflectance infrared Fourier transform specsoot, evident at 2335 cm<sup>-1</sup>, has been reported in other studies.

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