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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > resonance line |
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 alpha | ionized helium (He II) | 227 Å | 303.78 Å | ionized helium Lyman line | ||
Lyman alpha | hydrogen (H I) | 2 | The resonance line of hydrogen. It can only be studied from spacecraft or in the spectra of highly redshifted quasars. | 912 Å | 1215.67 Å | Lyman line |
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