emission spectra

emission spectrum

noun Physics.
the spectrum formed by electromagnetic radiations emitted by a given source, characteristic of the source and the type of excitation inducing the radiations.

Origin:
1885–90

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World English Dictionary
emission spectrum
 
n
Compare absorption spectrum the continuous spectrum or pattern of bright lines or bands seen when the electromagnetic radiation emitted by a substance is passed into a spectrometer. The spectrum is characteristic of the emitting substance and the type of excitation to which it is subjected

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Science Dictionary
emission spectrum  
The distribution of electromagnetic radiation released by a substance whose atoms have been excited by heat or radiation. A spectroscope can be used to determine which frequencies have been emitted by a substance. The emission spectrum is a combination of the atomic spectra of the various kinds of atoms making up the substance and can be analyzed to determine the substance's chemical or atomic composition. See more at atomic spectrum.
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