Einfluss der Partikelgeometrie auf die optischen Eigenschaften stark absorbierender Farbstoffteilchen

The extinction coefficients of spherical and ellipsoidal modelparticles of complex index of refraction have been measured. In the case of spherical particles the results are in good agreement with the predictions of the MIE theory. An empirical relationship has been worked out which relates the optical behaviour of needle-shaped ellipsoidal particles of defined eccentricity and size to an equivalent MIE diameter. The measurements have been performed in the range of size 0,2 < D₀ < 1,3 μ and eccentricity 1 ? p < 10.