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Absorption spectroscopy
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===Relation to emission spectrum=== [[File:Emission spectrum-Fe.svg|thumb|400px|The emission spectrum of [[iron]]]] [[Emission (electromagnetic radiation)|Emission]] is a process by which a substance releases energy in the form of electromagnetic radiation. Emission can occur at any frequency at which absorption can occur, and this allows the absorption lines to be determined from an emission spectrum. The [[emission spectrum]] will typically have a quite different intensity pattern from the absorption spectrum, though, so the two are not equivalent. The absorption spectrum can be calculated from the emission spectrum using [[Einstein coefficients]].
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