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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
subject			fact

He II Lyman alpha	has wavelength 303.78 Å
	is an instance of resonance line
	is an instance of ionized helium Lyman line
ionized helium Lyman line	has series limit 227 Å
	has lower energy level 1
ionized helium line	has species ionized helium (He II)
spectral line	has transition
	has equivalent width
spectral feature	has width
	occurs in
radiation measurement	has unit radiation unit
number	has value