Reflectance Difference Spectroscopy
Encyclopedia
Reflectance difference spectroscopy is a spectroscopic
technique which measures the difference in reflectance of two beams of light
that are shone in normal incident on a surface with different linear polarization
s. It is also known as reflectance anisotropy spectroscopy (RAS).
It is calculated as:
and 
are reflectance in two different polarizations.
Spectroscopy
Spectroscopy is the study of the interaction between matter and radiated energy. Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, e.g., by a prism. Later the concept was expanded greatly to comprise any interaction with radiative...
technique which measures the difference in reflectance of two beams of light
Light
Light or visible light is electromagnetic radiation that is visible to the human eye, and is responsible for the sense of sight. Visible light has wavelength in a range from about 380 nanometres to about 740 nm, with a frequency range of about 405 THz to 790 THz...
that are shone in normal incident on a surface with different linear polarization
Linear polarization
In electrodynamics, linear polarization or plane polarization of electromagnetic radiation is a confinement of the electric field vector or magnetic field vector to a given plane along the direction of propagation...
s. It is also known as reflectance anisotropy spectroscopy (RAS).
It is calculated as:
and are reflectance in two different polarizations.