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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > resonance line

resonance line
subject			fact

resonance line	has definition The longest-wavelength line arising from the ground state.
	is a kind of spectral line
spectral line	has transition
	has equivalent width
spectral feature	has wavelength
	has width
	occurs in
	has species
radiation measurement	has unit radiation unit
number	has value

Kinds of resonance line :

• He II Lyman alpha (3 facts)
• Lyman alpha (5 facts) - The resonance line of hydrogen. It can only be studied from spacecraft or in the spectra of highly redshifted quasars.