Читать книгу Continuous Emission Monitoring - James A. Jahnke - Страница 123

Particles smaller than about 0.1 μm will scatter visible light by Rayleigh scattering. In this case, the electric field of light interacts with electrons within the particle molecules.

The electrons are correspondingly accelerated in their motion in the molecule. It is a phenomenon of nature that an accelerated electron will emit electromagnetic radiation in all directions. The net effect is that the oscillating electron scatters light out of the light beam. Due to this phenomenon, small particles (<0.1 μm) are very effective in scattering visible light.