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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > absorption line > Fraunhofer line > H alpha
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H alpha comparison table
Subject has discoverer has lower energy level has specie has upper energy level has definition has dicovery date occurs in has series limit is a kind of has wavelength is an instance of has antonym
Balmer line 2hydrogen (H I) The series lies in the visible portion of the spectrum. (Deuterium Hα is 1.785 Å short-ward of hydrogen Hα)  3647 Åhydrogen line   
Fraunhofer lineJoseph Fraunhofer   Absorption line in the spectrum of the Sun, studied by Fraunhofer in 1814. The nine most prominent he labeled with capital letters (from the red end) A. B. C. D. E. F. G. H. and K. The A band and B band are now known to be groups of telluric lines due to O2 absorption in Earth's atmosphere, and C and F are respectively known as Hα and Hβ.1814Sun absorption line  emission line
spectral line    A line corresponding to an image of the entrance slit of the spectrometer, seen when light is either emitted by or interrupted by a hot rarefied gas such as hydrogen. The pattern is characteristic of the gas and the wavelength at which the features are observed to occur is indicative of the velocity of the object.   spectral feature   
H alphaJoseph Fraunhofer2 3 1814Sun3647 Å 6563 ÅBalmer lineemission line

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