Also found in: Dictionary, Thesaurus, Medical.
Related to dark-line spectrum: Absorption lines
dark-line spectrum:see spectrumspectrum,
arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other property. Beams of charged particles can be separated into a spectrum according to mass in a mass spectrometer (see mass spectrograph).
..... Click the link for more information. .
dark-line spectrum[′därk ¦līn ′spek·trəm]
The absorption spectrum that results when white light passes through a substance, consisting of dark lines against a bright background.