ELECTRONES AUGER PDF

These energy levels depend on the type elecfrones atom and the chemical environment in which the atom was located. International Journal of Materials Research. The resulting spectra can be used to determine the identity of the emitting atoms and some information about their environment. Auger electron spectroscopy by Lizeth Ospina on Prezi The reverse effect is known as impact ionization. From Wikipedia, the free encyclopedia. In other projects Wikimedia Commons.

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Jump to navigation Jump to search Physical phenomenon Two views of the Auger process. An incident electron or photon creates a core hole in the 1s level. An electron from the 2s level fills in the 1s hole and the transition energy is imparted to a 2p electron which is emitted.

The final atomic state thus has two holes, one in the 2s orbital and the other in the 2p orbital. The Auger effect is a physical phenomenon in which the filling of an inner-shell vacancy of an atom is accompanied by the emission of an electron from the same atom.

Although most often this energy is released in the form of an emitted photon , the energy can also be transferred to another electron, which is ejected from the atom; this second ejected electron is called an Auger electron. These energy levels depend on the type of atom and the chemical environment in which the atom was located. Auger electron spectroscopy involves the emission of Auger electrons by bombarding a sample with either X-rays or energetic electrons and measures the intensity of Auger electrons that result as a function of the Auger electron energy.

The resulting spectra can be used to determine the identity of the emitting atoms and some information about their environment. Auger recombination is a similar Auger effect which occurs in semiconductors. An electron and electron hole electron-hole pair can recombine giving up their energy to an electron in the conduction band , increasing its energy. The reverse effect is known as impact ionization. The Auger effect can impact biological molecules such as DNA.

Following the K-shell ionization of the component atoms of DNA, Auger electrons are ejected leading to damage of its sugar-phosphate backbone. The French physicist Pierre Victor Auger independently discovered it in [6] upon analysis of a Wilson cloud chamber experiment and it became the central part of his PhD work. The observation of electron tracks that were independent of the frequency of the incident photon suggested a mechanism for electron ionization that was caused from an internal conversion of energy from a radiationless transition.

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