Interpretation of small-angle light-scattering maxima of single-oriented microparticles

He-Ne laser scattering intensity distributions to approximately 10 degrees have been obtained for a class of single-oriented semiopaque pollen species 20 to 100 microm in size. Because of the three-dimensional structure of the particle, pattern centrosymmetry fails initially at low scattering angles where particle diffraction intensity dominates. Thus the flat-particle assumption used to interpret randomly oriented particle scattering is not strictly applicable to oriented particles. Nevertheless, Fraunhofer diffraction from the flat particle is on the average a good approximation to the position and shape of at least the first several intensity maxima.