What is the Auger effect, and what are the three-electron processes involved in Auger electron emission?
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The Auger effect is a physical phenomenon in which the filling of an inner-shell vacancy in an atom leads to the emission of an electron from the same atom, rather than the emission of an X-ray photon. This process occurs as a non-radiative relaxation mechanism Show more…
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In a technique used for surface analysis called Auger electron spectroscopy (AES), electrons are accelerated toward a metal surface. These electrons cause the emission of secondary electrons (called Auger electrons) from the metal surface. The kinetic energy of the Auger electrons depends on the composition of the surface. The presence of oxygen atoms on the surface results in Auger electrons with a kinetic energy of approximately 500 eV.
Adi S.
An electron in chromium moves from the $n=2$ state to the $n=1$ state without emitting a photon. Instead, the excess energy is transferred to an outer electron (one in the $n=4$ state), which is then ejected by the atom. In this Auger (pronounced "ohjay") process, the ejected electron is referred to as an Auger electron. (a) Find the change in energy associated with the transition from $n=2$ into the vacant $n=1$ state using Bohr theory. Assume only one electron in the $\mathrm{K}$ shell is shielding part of the nuclear charge. (b) Find the energy needed to ionize an $n=4$ electron, assuming 22 electrons shield the nucleus. (c) Find the kinetic energy of the ejected (Auger) electron. (All answers should be in electron volts.)
Penny R.
Lien L.
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