Spectroscopy is used in physical and analytical chemistry because atoms and molecules have unique spectra.The measured spectra are used to determine the chemical composition and physical properties of astronomical objects (such as their temperature and velocity). Spectroscopy provides a precise analytical method for finding the constituents in material having unknown chemical composition. In a typical spectroscopic analysis, a concentration of a few parts per million of a trace element in a material can be detected through its emission spectrum.
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