Spectroscopy

Definition: Spectroscopy is a technique for analyzing and measuring the interaction between electromagnetic radiation and matter. In this process, a spectrometer records the intensity of radiation as a function of energy, frequency or wavelength – the spectrum – after it interacts with or is emitted from a particular material being studied. Since these spectra depend on the absorption and emission properties of the material, and thus on their physical and chemical structure, composition and concentration, they can be used to classify materials.

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References:

https://doi.org/10.1016/j.jag.2017.10.004

Related terms: Functional Near Infrared Spectroscopy, Spatially resolved spectroscopy