- Bright line seen in an emission spectrum. Usually caused by radiation from a hot gas superimposing its spectrum on the radiation from a cooler object, as with the Sun’s outer atmosphere modifying radiation from the Sun’s surface. If emission processes in the gas are using all the energy passing through it, a spectrum can consist entirely of bright lines on a dark background. Otherwise the observer sees bright lines on a background which also contains radiation, but at a lower level of energy.
- In spectroscopy, a characteristic frequency of electromagnetic radiation which is emitted by atoms, corresponding to a transition of an electron to a lower energy level. It appears as a bright spectral line.
- Any extremely narrow range of emitted wavelengths within the electromagnetic spectrum.
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