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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > absorption line > Fraunhofer line > H alpha

H alpha
subject			fact

H alpha	has wavelength 6563 Å
	has upper energy level 3
	is an instance of spectral line
	is an instance of Fraunhofer line
	is an instance of Balmer line
Fraunhofer line	has dicovery date 1814
	has discoverer Joseph Fraunhofer
	occurs in Sun
Balmer line	has series limit 3647 Å
	has lower energy level 2
spectral line	has transition
	has equivalent width
absorption line	has antonym emission line
hydrogen line	has species hydrogen (H I)
spectral feature	has width
	has species
radiation measurement	has unit radiation unit
number	has value

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