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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.
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 Compare absorption spectrum
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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  • Emissive

    [ih-mis-iv] /ɪˈmɪs ɪv/ adjective 1. serving to emit. 2. pertaining to .

  • Emissivity

    [em-uh-siv-i-tee, ee-muh-] /ˌɛm əˈsɪv ɪ ti, ˈi mə-/ noun, Thermodynamics. 1. the ability of a surface to emit radiant energy compared to that of a black body at the same temperature and with the same area. /ɪmɪˈsɪvɪtɪ; ˌɛm-/ noun 1. a measure of the ability of a surface to radiate energy; the ratio of the […]

  • Emit

    [ih-mit] /ɪˈmɪt/ verb (used with object), emitted, emitting. 1. to send forth (liquid, light, heat, sound, particles, etc.); discharge. 2. to give forth or release (a sound): He emitted one shrill cry and then was silent. 3. to utter or voice, as opinions. 4. to issue, as an order or a decree. 5. to issue […]

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