C. Heffels et al., FORWARD LIGHT-SCATTERING FOR ARBITRARY SHARP-EDGED CONVEX CRYSTALS INFRAUNHOFER AND ANOMALOUS DIFFRACTION APPROXIMATIONS, Applied optics, 34(28), 1995, pp. 6552-6560
Fraunhofer diffraction is a well-known physical model for describing f
orward light scattering from opaque particles much larger than the wav
elength of the light. Analytical expressions exist for diffraction fro
m circular- or rectangular-shaped apertures. An expression is derived
for diffraction by apertures of a general polygonal shape. From this e
xpression the exact solution for anomalous diffraction by arbitrary co
nvex crystals is calculated. These expressions are useful in character
izing crystal size and shape, by laser diffraction instruments, when m
easured in a solution.