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A. R. Forouhi and I. Bloomer deduced dispersion equations for the refractive index, n, and extinction coefficient, k, which were published in 1986 [1] and 1988. [2] The 1986 publication relates to amorphous materials, while the 1988 publication relates to crystalline.
Optical depth is a measure of the extinction coefficient or absorptivity up to a specific 'depth' of a star's makeup. [ 1] The assumption here is that either the extinction coefficient or the column number density is known. These can generally be calculated from other equations if a fair amount of information is known about the chemical makeup ...
Therefore, measurements at two wavelengths yields two equations in two unknowns and will suffice to determine the amount concentrations c 1 and c 2 as long as the molar attenuation coefficients of the two components, ε 1 and ε 2 are known at both wavelengths. This two system equation can be solved using Cramer's rule.
Extinction coefficient refers to several different measures of the absorption of light in a medium: Attenuation coefficient, sometimes called "extinction coefficient" in meteorology or climatology. Mass extinction coefficient, how strongly a substance absorbs light at a given wavelength, per mass density. Molar extinction coefficient, how ...
Here, the real part n is the refractive index and indicates the phase velocity, while the imaginary part κ is called the optical extinction coefficient or absorption coefficient—although κ can also refer to the mass attenuation coefficient [39]: 3 —and indicates the amount of attenuation when the electromagnetic wave propagates through ...
In chemistry, the molar absorption coefficient or molar attenuation coefficient ( ε) [ 1] is a measurement of how strongly a chemical species absorbs, and thereby attenuates, light at a given wavelength. It is an intrinsic property of the species. The SI unit of molar absorption coefficient is the square metre per mole ( m2/mol ), but in ...
Description. An electromagnetic wave propagating in the + z -direction is conventionally described by the equation: where. E0 is a vector in the x - y plane, with the units of an electric field (the vector is in general a complex vector, to allow for all possible polarizations and phases); ω is the angular frequency of the wave;
k a is the absorption coefficient; w 1 is the mixing ratio; ρ 0 is the density of air at sea level; H is the scale height of the atmosphere; z is the height in question; The optical depth of a plane parallel cloud layer is given by [3] = [] / where: Q e is the extinction efficiency