The study of the interaction between matter and electromagnetic radiation is called Spectroscopy. Historically, spectroscopy began through the study of visible light dispersed according to its wavelength, by a prism. Later the concept was extended enormously to include any interaction with radioactive energy as a function of its wavelength or frequency. Spectroscopic information is frequently represented by an emission spectrum, a plot of the response of interest as a function of wavelength or frequency. Spectrometers, spectrophotometers, spectrographs or spectral analyzers are the Spectral measurement devices.
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