The term molar extinction coefficient (ε) is a measure of how strongly a chemical species or substance absorbs light at a particular wavelength. It is an intrinsic property of chemical species that is dependent upon their chemical composition and structure. The SI units of ε are m2/mol, but in practice they are usually taken as M-1cm-1. The molar extinction coefficient is frequently used in spectroscopy to measure the concentration of a chemical in solution.
You can use the Beer-Lambert Law to calculate a chemical species’ ε:
A = εLc
Where:
Rearrange the Beer-Lambert equation in order to solve for the molar extinction coefficient:
ε = A/Lc
Use the molar extinction coefficient to determine the brightness of a fluorescent molecule, by using the following equation:
So , ε = A/Lc = 70.80 / 1 * ( 5* 10^-5 ) = 1.5 * 10^6 . Answer .
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