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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > resonance line
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resonance line comparison table
Subject has specie has upper energy level has definition has series limit has wavelength is an instance of
He II Lyman alphaionized helium (He II)  227 Å303.78 Åionized helium Lyman line
Lyman alphahydrogen (H I)2The resonance line of hydrogen. It can only be studied from spacecraft or in the spectra of highly redshifted quasars.912 Å1215.67 ÅLyman line

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