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date: 22 November 2019


A Dictionary of Forensic Science

Suzanne Bell

A measure of the amount of electromagnetic energy that is absorbed by a given sample. The amount of energy absorbed will depend on the concentration of the sample, the amount of sample through which the energy travels, and a constant called the molar absorptivity coefficient (ε). This coefficient depends on the structure of the sample molecule and the wavelength of the energy. This relationship is summarized as the Beer–Lambert Law: A = εbc where ε is the molar absorptivity, b is the path length and c is concentration. Many spectrophotometric techniques used in forensic science take advantage of this relationship to determine the concentration of a sample. In other cases, such as ... ...

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