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Spectral Line
(redirected from Emission line)

    Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
spectral line [′spek·trəl ‚līn]
(spectroscopy)
A discrete value of a quantity, such as frequency, wavelength, energy, or mass, whose spectrum is being investigated; one may observe a finite spread of values resulting from such factors as level width, Doppler broadening, and instrument imperfections. Also known as spectrum line.
Spectral Line 

a thin line in an optical spectrum. Each such line can be characterized by a certain wavelength λ or frequency v = c/λ, where c is the speed of light. Spectral lines are observed in emission spectra as bright (colored) lines on a dark background and in absorption spectra as dark lines on a bright background. Each spectral line corresponds to a definite quantum transition in an atom, molecule, or crystal. Spectral lines are not strictly monochromatic: each one has a certain width Δλ.
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Although the changes in the optical spectrum are subtle, amounting to only a few percent of excess emission superimposed on the usual broad emission lines from the WR star, members had honed their observing and data reduction skills in the run up to the campaign and it proved possible to track the changes with good precision.
2 Increased Pro-Am cooperation in spectroscopy delivers results by Leadbeater, Robin / Journal of the British Astronomical Association
The material falling into a black hole emits light in narrow wavelength regions forming emission lines which can be seen when the light is dispersed into a spectrum.
Astronomers discover a pair of twin black holes by Asian News International
Gas tightly bound to an ejected black hole would stay with the hole and rotate rapidly, producing a broad emission line showing up as a fat rather than narrow peak.
Supermassive black hole says sayonara to its galaxy: evidence ... by Cowen, Ron / Science News
 
 
 
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