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absorption edge

noun, Physics.
a discontinuity in the graph of the absorption coefficient of a substance plotted against the wavelength of x-rays being absorbed, representing the minimum energy necessary to free electrons from particular shells of the atoms of the substance.
Also called absorption discontinuity, absorption limit.
Origin of absorption edge
1925-29 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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