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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > ionized helium line

ionized helium line
subject			fact

ionized helium line	has definition Set of spectral features associate with ionized helium (He II)
	is a kind of spectral line
	has species ionized helium (He II)
spectral line	has transition
	has equivalent width
spectral feature	has wavelength
	has width
	occurs in
radiation measurement	has unit radiation unit
number	has value

Kinds of ionized helium line :

• ionized helium Balmer line (1 kind, 4 facts)
• ionized helium Lyman line (1 kind, 7 facts)
• ionized helium Paschen line (1 kind, 6 facts)
• Pickering line (2 kinds, 10 facts) (ionized helium Brackett line)