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Measurement of scattered light intensity and aerodynamic particle sizing are two methods that have recently been coupled with time-of-flight mass spectrometry for real-time determination of aerosol particle size and composition. An aerosol analysis technique recently developed in our laboratory, aerosol time-of-flight mass spectrometry, offers a unique experimental platform to evaluate both of these sizing techniques. This paper presents a comparison of results obtained with these two methods.

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The process of photochemical hole burning in rigidly coupled polyacenes is discussed.Photochemical mechanisms in these systems are conducive to low temperature spectral hole burning. Several factors which determine the shape and width of spectral holes are discussed. Prospects for use in information storage applications are presented.