A model for Raman and fluorescent scattering by molecules embedded in small particles is described. This takes into account the effect of the particle's geometrical and optical properties upon the unshifted field which excites the molecular transitions within the particle, and upon the shifted field. Formulas are given which relate the angular distribution of the scattered radiation to the nature of the molecular scatterers and to the size and refractive index of the particle. These results are relevant for current problems in cell biology and atmospheric physics.

• Received 13 March 1975

DOI:https://doi.org/10.1103/PhysRevA.13.396