Scattering by large particles

Justification for dividing the light scattered by large particles into diffracted, reflected, and transmitted components is provided by the localization principle (van de Hulst, 1957, pp. 208-214) whereby the terms in the Mie series are associated with each of these components. 

There are both similarities and differences between scattering by spherical and by nonspherical particles. Near the forward direction, where scattering may be associated primarily with diffraction, external reflection, and twice-refracted transmission (Hodkinson and Greenleaves, 1963), nonspherical particles scatter similarly to area-equivalent spheres, in general. Forward scattering by large particles is dominated by diffraction, which depends on particle... 

FIGURE 9.4 Destructive interference of light scattered by large particles. Waves arriving at the forward observation point are AX out of phase and those arriving at the backward point are out of phase. For large polymer molecules AXf < A shown also in Figure 9.5. 

Volcanic eruptions provide one test of the relationship between light scattering by sulfate particles and the resulting change in temperature, since they generate large concentrations of sulfate aerosol in the lower stratosphere and upper troposphere. These aerosol... 

A brief treatment of scattering by large, absorbing particles and the concept of absorption and scattering cross sections are presented in Section 5.7 along with two examples of applications of the Mie theory (to absorbing, but small, particles) and a discussion of Tyndall spectra. 

For scattering by Brownian particles, E g,t) is a Gaussian variable (varies with time in a Gaussian fashion) when the number of particles in the observed scattering volume is large. The two autocorrelation functions are then related by... 

---