SIZING OF COLLOIDAL PARTICLES WITH LIGHT-SCATTERING - CORRECTIONS FORBEGINNING MULTIPLE SCANNING

Static light scattering is widely used for sizing of particles with ra dii in the range of 50 nm up to several micrometers. These experiments usually require very low particle concentrations (<10(-4)) for preven tion of multiple scattering. As a consequence, nonabsorbing samples th at are suited for light-scattering investigations must be transparent so that the transmittance of the incident light is typically above 95% . Investigations of less translucent samples require corrective terms for the beginning of multiple scattering to retrieve the particle-size distribution successfully. We applied a computationally convenient fi rst-order approximation for the multiple-scattering problem that has H artel's approach in its first steps. When incorporated into our invers ion technique, this approximation functions well for samples with tran smittances above 30%. We present examples of applications to experimen tal data.