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absorption edge

noun, Physics.
1.
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
1925-1929
1925-29
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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