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

Pfund line comparison table

Subject	has specie	has definition	is a kind of	has wavelength
hydrogen line	hydrogen (H I)	Set of spectral features associate with neutral hydrogen (H I)	spectral line
spectral series line		A spectral line belonging to a series of lines of a given atom arising from transitions with a common lower energy level.	spectral line
Pfund line	hydrogen (H I)		hydrogen line	far-infrared

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