Spectroscopy is the study of the
interaction between matter and electromagnetic radiation (via electron
spectroscopy, atomic spectroscopy, etc). 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, predominantly in
the electromagnetic spectrum, though matter waves and acoustic waves can also
be considered forms of radiative energy; recently, with tremendous difficulty,
even gravitational waves have been associated with a spectral signature in the
context of the Laser Interferometer Gravitational-Wave Observatory (LIGO) and
laser interferometry. Spectroscopic data are often represented by an emission
spectrum, a plot of the response of interest, as a function of wavelength or
frequency.
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