Absorption edge

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

An absorption edge, absorption discontinuity or absorption limit is a sharp discontinuity in the absorption spectrum of a substance. These discontinuities occur at wavelengths where the energy of an absorbed photon corresponds to an electronic transition or ionization potential. When the quantum energy of the incident radiation becomes smaller than the work required to eject an electron from one or other quantum states in the constituent absorbing atom, the incident radiation ceases to be absorbed by that state. For example, incident radiation on an atom of a wavelength that has a corresponding energy just below the binding energy of the K-shell electron in that atom cannot eject the K-shell electron.[1]

See also

References

  1. ^ "The Penguin Dictionary of Physics", 3rd ed., Longman Group Ltd. (2000), p. 3.


Retrieved from "https://en.wikipedia.org/w/index.php?title=Absorption_edge&oldid=845919795"
This content was retrieved from Wikipedia : http://en.wikipedia.org/wiki/Absorption_edge
This page is based on the copyrighted Wikipedia article "Absorption edge"; it is used under the Creative Commons Attribution-ShareAlike 3.0 Unported License (CC-BY-SA). You may redistribute it, verbatim or modified, providing that you comply with the terms of the CC-BY-SA