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spectral line
(redirected from Absorption line)

    Also found in: Encyclopedia, Wikipedia 0.02 sec.

spectral line

Dark line visible in an absorption spectrum, or one of the bright lines that make up an emission spectrum. Spectral lines are caused by the transfer of an electron in an atom from one energy level to another; strong lines are produced at levels at which such transfer occurs easily, weak where it occurs with difficulty. Ionization of certain elements can affect such transfers and cause problems in spectral analysis.



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? Mentioned in ? References in periodicals archive
 
So, if light from both images carried the same fingerprint -- the same absorption line -- this would indicate that the hydrogen cloud was wide enough for both beams to pass through it.
Quasar hunt bags unusual quarry by Cowen, Ron / Science News
If you name a particular absorption line in an atom, I can devise a way to make that absorption line from reasonably to very transparent.
Opening a window of transparency by Peterson, Ivars / Science News
Atomic and molecular absorption lines are very stable under changing environmental conditions and are excellent references for this purpose.
NIST demonstrates hybrid wavelength calibration reference. (General ... by Journal of Research of the National Institute of Standards and Technology
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