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absorbance
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absorption spectrum
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absorption spectrum

ab·sorp·tion spec·trum (plural ab·sorp·tion spec·trums)


noun 
Definition:
 
lines of radiation in absorbing medium: the pattern of dark bands that is seen when electromagnetic radiation passes through an absorbing medium and is observed with a spectroscope. It is the result of unequal absorption of the radiation as it passes through the medium.

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