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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > absorption edge
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absorption edge comparison table
Subject has specie has definition has synonym has wavelength
Balmer jumphydrogen (H I)The sudden decrease in the intensity of the continuous spectrum at the limit of the Balmer series of hydrogen at 3646 Å, representing the energy absorbed when electrons originally in the second energy level are ionized.Balmer discontinuity3646 Å
Helium discontinuityhelium (He I)   
K edge The absorption edge of the K shell (see absorption edges).  

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