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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > ionized helium line > ionized helium Paschen line
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ionized helium Paschen 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 Paschen alpha3ionized helium (He II) radiation unit  2040 Å4686 Å  ionized helium Paschen line

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