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| abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > hydrogen line | 
| hydrogen line comparison table | ||||
| Subject | has lower energy level | has definition | has series limit | has wavelength | 
|---|---|---|---|---|
| Balmer line | 2 | The series lies in the visible portion of the spectrum. (Deuterium Hα is 1.785 Å short-ward of hydrogen Hα) | 3647 Å | |
| Brackett line | 4 | |||
| Lyman line | 1 | 912 Å | ||
| Paschen line | 3 | 8204 Å | ||
| Pfund line | 5 | far-infrared | 
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