Mie Scattering
Definition and meaning of Mie Scattering in chemistry.
Mie scattering is the elastic scattering of light by particles that have a diameter similar to or larger than the wavelength of the incident light. It describes how light interacts with relatively large particles, such as those found in colloidal suspensions or atmospheric aerosols.
In more detail
Unlike Rayleigh scattering, which applies to particles much smaller than the wavelength of light and is highly dependent on the wavelength, Mie scattering is not strongly wavelength dependent. This results in the scattered light maintaining the original color of the incident beam, which is why clouds appear white when sunlight scatters off relatively large water droplets. The intensity of Mie scattering typically has a strong forward directivity, meaning light is scattered mostly in the direction it was already traveling. It is a fundamental concept for understanding meteorological optics.
Key facts
| Field | Physical Chemistry |
|---|---|
| Particle Size | Similar to or larger than the incident light wavelength |
| Wavelength Dependence | Weakly dependent, scattering all colors equally |
The opaque, white appearance of milk is caused by the Mie scattering of all visible wavelengths of light by the suspended microscopic fat droplets.
Frequently asked questions
How does Mie scattering fundamentally differ from Rayleigh scattering?
Rayleigh scattering involves particles much smaller than the light wavelength and is highly wavelength dependent, while Mie scattering involves larger particles and scatters all wavelengths roughly equally.