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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > ionized helium line > ionized helium Balmer line
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ionized helium Balmer line comparison table
Subject has lower energy level has specie has equivalent width has unit has value occurs in has series limit has wavelength has transition has width is an instance of
He II Balmer alpha ionized helium (He II) radiation unit   1640 Å  ionized helium Balmer line

Next ionized helium lineionized helium Lyman line    Upionized helium line, spectral series line    Previous ionized helium linePickering line