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spectral line comparison table
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absorption line   Dark line superposed on a continuous spectrum, caused by the absorption of light passing through a gas of lower temperature than the continuum light source.  spectral line  emission line
emission line   Bright lines produced in a spectrum by a luminous source, such as a star or a bright nebula.  spectral line  absorption line
H alphaJoseph Fraunhofer 3 1814Sun 6563 ÅBalmer lineemission line
H betaJoseph Fraunhofer 4 1814Sun 4861 ÅBalmer lineemission line
H delta  6    4101 ÅBalmer line 
H gamma  5    4342 ÅBalmer line 
hydrogen line hydrogen (H I) Set of spectral features associate with neutral hydrogen (H I)  spectral line   
intercombination line   Spectral line emitted in transitions between two levels with different values of S.  spectral line   
ionized helium line ionized helium (He II) Set of spectral features associate with ionized helium (He II)  spectral line   
resonance line   The longest-wavelength line arising from the ground state.  spectral line   
spectral series line   A spectral line belonging to a series of lines of a given atom arising from transitions with a common lower energy level.  spectral line   
U line sodium (Na I)    spectral line3302 Å  

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