<P> Spectroscopy / spɛkˈtrɒskəpi / is the study of the interaction between matter and electromagnetic radiation . Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, by a prism . Later the concept was expanded greatly to include any interaction with radiative energy as a function of its wavelength or frequency . Spectroscopic data are often represented by an emission spectrum, a plot of the response of interest as a function of wavelength or frequency . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (April 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table>

Spectroscopy is the study of the interaction of molecules with