Calculating Absorption Coefficient

This equation also includes a frequency-independent constant, A*, which can be calculated using the formula: A* = (4πK)/λo. In summary, to graph the absorption coefficient for Copper tetra-tert butyl phthlocyanine, you will need to use the extinction coefficient and refraction values to calculate the constant A* and then use it in the equation a = (4πK)/λo * √(E(eV)-Eg) to plot the absorption coefficient against wavelength.
  • #1
ajbriggs
4
0
I am currently trying to graph the absorption coefficient of Copper tetra-tert butyl phthlocyanine. I have the extinction coefficient vs wavelength graph and refraction vs wavelength graph however I don't know how to use these to graph absorption coefficient.



E(eV)=1242.4/λ

absorption coef. = A* √(hv-Eg)
h = planks cons.
v = freq. of electron
Eg = band gap
A* is a certain frequency-independent constant, with formula above?

a' = (4∏K)/λo
k = extinction coef.



absorption coef. = A* √(E(eV)-Eg)


Not a clue...
 
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  • #2
The absorption coefficient can be calculated from the extinction coefficient and refraction values by using the following equation: a = (4πK)/λo * √(E(eV)-Eg) where K is the extinction coefficient, λo is the wavelength of light, and Eg is the band gap.
 

Related to Calculating Absorption Coefficient

1. What is the absorption coefficient?

The absorption coefficient is a measure of how much of a material is absorbed by a given substance. It is often used to describe the ability of a material to absorb light or sound waves.

2. How is the absorption coefficient calculated?

The absorption coefficient is typically calculated by dividing the intensity of the incident wave by the intensity of the transmitted wave. This can be represented by the equation α = (Ii - It)/Ii, where α is the absorption coefficient, Ii is the intensity of the incident wave, and It is the intensity of the transmitted wave.

3. What factors can affect the absorption coefficient?

The absorption coefficient can be affected by several factors, including the properties of the material (such as density, thickness, and chemical composition), the wavelength of the incident wave, and the angle of incidence. Other factors, such as temperature and pressure, can also play a role in determining the absorption coefficient.

4. What units is the absorption coefficient typically measured in?

The absorption coefficient is typically measured in units of inverse length, such as cm-1 or m-1. This represents the amount of material that is absorbed per unit distance traveled by the incident wave.

5. How is the absorption coefficient used in scientific research?

The absorption coefficient is an important parameter in various fields of science, including physics, chemistry, and materials science. It is often used to study the interaction of light and matter, as well as to characterize the properties of materials. In particular, it is used in spectroscopy techniques to identify and quantify different substances based on their absorption spectra.

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