Abstract

Simple relationships for calculating the Ångström parameter α of any disperse system are obtained (a) for a polycomponent system, through values of αi of individual components, and (b) for the simplest disperse systems, consisting of large, small, and soft particles. It is shown that the parameter α of a monodisperse particle system is sensitive to the exact structure of the spectral variability optical thickness of the system curve τ(λ) and that when calculating α, one should not use the van de Hulst approximate formula for τ(λ) when ripples and another important details are not accounted for. The error connected with the use of the van de Hulst formula when one is estimating α depends on the value of optical hardness of the particle. It is small when particles are soft, and it becomes noticeable as particles get harder.

© 1995 Optical Society of America

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