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

hydrogen line
subject			fact

hydrogen line	has definition Set of spectral features associate with neutral hydrogen (H I)
	is a kind of spectral line
	has species hydrogen (H I)
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 hydrogen line :

• Balmer line (4 kinds, 23 facts) - The series lies in the visible portion of the spectrum. (Deuterium Hα is 1.785 Å short-ward of hydrogen Hα)
• Brackett line (1 kind, 5 facts)
• Lyman line (2 kinds, 12 facts)
• Paschen line (1 kind, 7 facts)
• Pfund line (4 facts)