absorption lines


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ab·sorp·tion lines

the dark lines in the solar spectrum corresponding to wavelengths originally emitted by inner layers of the Sun but then absorbed by various elements present in gaseous form in cooler layers and in the Earth's atmosphere.
Synonym(s): Fraunhofer lines

ab·sorp·tion lines

(ăb-sōrp'shŭn līnz)
Dark lines in the solar spectrum due to absorption by the solar and the earth's atmosphere.

absorption lines

In spectroscopy, dark lines of the solar spectrum.
References in periodicals archive ?
When the researchers simulated the Hitomi spectrum by adding this absorption line to the hot gas' emission line seen with Chandra and XMM-Newton, they found no evidence in the summed spectrum for either absorption or emission of X-rays at 3.
For the integrated line spectroscopy the magnitude to be measured is the area under a few absorption lines.
Since the late 1960s, observers have been checking to see whether the spacings between the absorption lines in quasar spectra differ slightly from those observed in laboratory experiments.
Amos sings, ``My absorption lines, they are frayed and I fear.
Furthermore, infrared DIAL systems are preferred because they are highly sensitive to the laser energy, are relatively eye safe, and more importantly, are in the spectral range where most molecular-specific absorption lines occur.
SIRILAS semiconductor lasers, with an efficiency of more than 50 percent, are ideal pumping sources because their output can be precisely tuned to the absorption lines of the solid-state laser materials.
By placing a gas cell between their spectrograph and the Canada-France-Hawaii Telescope, they superimpose narrow absorption lines onto the observed stellar spectra.
By comparing the positions of the absorption lines measured by the telescope with the positions measured in the laboratory, they can tell whether alpha is different near the white dwarf.
Quasars whose spectra show such broad absorption lines are known as "BAL quasars.
The portable remote detection system integrates PAS and open-field acoustic resonator techniques to detect chemicals and explosives, inspect absorption lines, and measure absorption intensities.
Evolution of galaxies and the intergalactic matter can be studied by looking at quasar absorption lines.