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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > absorption edge > Balmer jump
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Balmer jump comparison table
Subject has specie has definition has synonym is a kind of has wavelength
absorption edge Sudden rises superposed on the smooth decrease of the curve of the attenuation coefficient, which cause the curve to have a typical sawtooth aspect. They generally occur at the limit of spectral lines. spectral feature 
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 discontinuityabsorption edge3646 Å

Next absorption edgeHelium discontinuity    Upabsorption edge    Previous absorption edgeK edge