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Spectroscopy is a means to obtain information from atomic systems (matter) by recording their response to an external excitation. One can classify the type of spectroscopy by the means of excitation (e.g. photons or electrons) and the kind of "particles" that are detected. Thus photon-in-photon-out spectroscopy refers to all kinds of scattering of electromagnetic radiation, e.g. X-ray emission spectroscopy. An important example for a photon-in-electron-out spectroscopy is photoelectron or photoemission spectroscopy.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Photon-in-photon-out". A list of authors is available in Wikipedia.
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