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

Lyman alpha
subject			fact

Lyman alpha	has wavelength 1215.67 Å
	has upper energy level 2
	has definition The resonance line of hydrogen. It can only be studied from spacecraft or in the spectra of highly redshifted quasars.
	is an instance of resonance line
	is an instance of Lyman line
Lyman line	has series limit 912 Å
	has lower energy level 1
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