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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > absorption edge

absorption edge
subject			fact

absorption edge	has definition 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.
	is a kind of spectral feature
spectral feature	has wavelength
	has width
	occurs in
	has species
radiation measurement	has unit radiation unit
number	has value

Kinds of absorption edge :

• Balmer jump (5 facts) (Balmer discontinuity) - 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.
• Helium discontinuity (2 facts)
• K edge (2 facts) - The absorption edge of the K shell (see absorption edges).