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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > ionized helium line > ionized helium Lyman line > He II Lyman alpha

He II Lyman alpha comparison table

Subject	has lower energy level	has specie	has definition	has series limit	is a kind of	has wavelength	is an instance of
ionized helium Lyman line	1	ionized helium (He II)		227 Å	ionized helium line
resonance line			The longest-wavelength line arising from the ground state.		spectral line
He II Lyman alpha	1	ionized helium (He II)		227 Å		303.78 Å	ionized helium Lyman line

Up: ionized helium Lyman line, resonance line