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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > hydrogen line
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hydrogen line comparison table
Subject has lower energy level has definition has series limit has wavelength
Balmer line2The series lies in the visible portion of the spectrum. (Deuterium Hα is 1.785 Å short-ward of hydrogen Hα)3647 Å 
Brackett line4   
Lyman line1 912 Å 
Paschen line3 8204 Å 
Pfund line5  far-infrared

Next spectral lineintercombination line    Upspectral line    Previous spectral lineH gamma