In absorbance spectroscopy (also known as absorption spectroscopy), a spectrometer is used to directly measure how much light is absorbed by a sample as a function of wavelength. Quantifying the absorbance of light by an atom or molecule can provide important information about the molecules electronic structure. Depending on the sample, absorbance measurements can also give you key insights into other material properties, such as sample concentration, phase changes, or composition changes. Spectrometer and Accessories Low Price Optical Spectrometer Light Sources And More Complete Kits for £2,400 Explore Now Contents Absorbance Theory Measuring Absorbance Defining Absorbance Molar Attenuation Coefficient Absorption Coefficient Absorbance Units Absorbance Uses Resources and References Absorbance Theory Band theory describes how electrons are organised within a solid. This can be useful when discussing different properties of a solid (conductors, semiconductors, or metals). Within an atom, electrons can exist in regions around
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