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

He II Paschen alpha
subject			fact

He II Paschen alpha	has wavelength 4686 Å
	is an instance of ionized helium Paschen line
ionized helium Paschen line	has series limit 2040 Å
	has lower energy level 3
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