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en:absorbance [2013/01/31 05:38] (current)
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 +======Absorbance======
 +A = log<​sub>​10</​sub>​(I<​sub>​0</​sub>/​I<​sub>​1</​sub>​)
  
 +=====Beer-Lambert law=====
 +There are several ways in which the law can be expressed,
 +
 +A=αlc
 +
 +I<​sub>​1</​sub>/​I<​sub>​0</​sub>​ = 10<​sup>​-A</​sup>​ = 10<​sup>​-αlc</​sup>​
 +
 +where,
 +
 +A = log<​sub>​10</​sub>​(I<​sub>​0</​sub>/​I<​sub>​1</​sub>​)
 +α = 4πk/λ
 +
 +Here,
 +
 +    * A is absorbance
 +    * I<​sub>​0</​sub>​ is the intensity of the incident light
 +    * I<​sub>​1</​sub>​ is the intensity after passing through the material
 +    * l is the distance that the light travels through the material (the path length)
 +    * c is the concentration of absorbing species in the material
 +    * α is the absorption coefficient or the molar absorptivity of the absorber
 +    * λ is the wavelength of the light
 +    * k is the extinction coefficient
 +
 +{{tag>​Spectrometry}}