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Resonance Line

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resonance line [′rez·ən·əns ‚līn]
(spectroscopy)
The line of longest wavelength associated with a transition between the ground state and an excited state.

Resonance Line 

a spectral line of the radiation from an atom at a frequency that coincides with the frequency of the light absorbed by the atom in its ground state. The term “resonance line” is usually applied to one or more of the strongest lines in the spectrum of resonance radiation.



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The resonance line width includes the effects of both inhomogeneities and intrinsic damping.
As the expansion of the universe is carrying distant galaxies away from us, these resonance lines will appear shifted to the red by some amount from the wavelengths at which they appear at rest in the laboratory.
 
 
 
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