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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > hydrogen line > Paschen line > Pa alpha

Pa alpha
subject			fact

Pa alpha	has wavelength 18751 Å
	has upper energy level 4
	is an instance of Paschen line
Paschen line	has series limit 8204 Å
	has lower energy level 3
hydrogen line	has species hydrogen (H I)
spectral line	has transition
	has equivalent width
spectral feature	has width
	occurs in
radiation measurement	has unit radiation unit
number	has value