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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.
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Origin of absorption edge

First recorded in 1925–29
Also called absorption discontinuity, absorption limit.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018