We describe an instrument that measures the concentration of optically absorbing aerosol particles in real time. This absorption is normally due to black carbon, which is a good tracer for combustion emission. The minimum resolving times range from seconds in urban environments to minutes in remote locations. We present results obtained during operation on an aircraft. Due to the time resolution capability, we can determine the spatial distributions of absorbing aerosol. From the Greek word "al8aAouv," "to blacken with soot," we have named this instrument the aethalometer.

We report vibrational Raman and infrared spectra for chemically separated CbO and C7e fullerenes. Thin film samples were prepared by subliming the chromatographically separated species onto appropriate substrates. The Cso Raman spectrum shows eight clear lines and two weaker ones. If CsO in fact has the proposed buckminsterhtllercne structure (as is strongly indicated by recent experiments), the present Raman measurements together with the four observed IR frequencies give a complete set of Raman and infrared active fundamental frequencies for this molecule. A comparison of this set with the calculated spectrum for buckminsterfullerene shows satisfactory agreement.

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