Light scattering size estimation of nearly monodisperse spherical particles in the multivalued region: A reminiscence

Abstract

For the size estimation of large, nearly monodisperse spherical particles, the forward angle dissymmetry technique (FAD) has been used and the results compared with data obtained by the transmission electron microscopy (TEM) and integral turbidity ratio (ITR) methods. Starting with a certain relative particle size which depends on the chosen angle pair, the FAD functions go through several extremes and become multivalued. The possibility of the particle size estimation under such conditions and, also, without the knowledge of actual particle concentration (but knowing the relative refractive index), is discussed in this paper.