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Auger effect. puplic

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Auger electron spectroscopy is an analytical technique used to study surfaces. It works by bombarding a sample with an electron beam, which causes ionization and the ejection of core electrons from atoms in the sample. As higher-energy electrons drop to fill these vacancies, their energy can be transferred to a secondary electron that is then ejected from the atom. This ejected electron is called an Auger electron. The instrument used in AES consists of an electron gun, sample, electron energy analyzer, electron detector, and output device to analyze and display the spectra of emitted Auger electrons.

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Auger electron spectroscopy
1- ionization of a core electron leaving a vacancy. 2- upper level electron falls into a the vacancy and release energy which is between few eV to 50k eV. second electron 3- The released energy might be transferred to another electron which is ejected from atom (if this energy was higher than its ionization energy.) This electron is called ( Auger electron ) Auger effect
Auger effect. puplic
Auger electron spectroscopy Analytical technique used in the study of surfaces. It is based on the auger effect. Instrumentation of AES : 1- electron gun 2- sample 3- electron energy analyzer 4- electron detector 5- output device
Principle of AES : 1- ionization of sample is done by focusing an electron beam toward sample. By using electron gun. 2- emitted electrons are deflected around the electron gun and pass through an aperture towards the back of the Cylindrical mirror analyzer
3- these electron excited es are directed into electron detector which consist of electron multiplier. The second electrons are produced in this step. 4- data is processed by playing different peaks for each sample.
Disadvantages of AESAdvantages of AES surface damagesimple analyzer required workhigh sensitivity complicated insulatorsrapid output rate high resolution
References : http://www.youtube.com/watch?v=wuyzTGn1rRs http://en.wikipedia.org/wiki/Auger_electron_spectrosc opy http://ac.els-cdn.com/S0169433207004187/1-s2.0- S0169433207004187-main.pdf?_tid=138def9e-aeab- 11e3-bba8- 00000aab0f27&acdnat=1395153734_b49b76af094d7f 844ab1142bf590abf3 http://iopscience.iop.org/1748-0221/8/03/P03020/

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Auger effect. puplic

  • 2. 1- ionization of a core electron leaving a vacancy. 2- upper level electron falls into a the vacancy and release energy which is between few eV to 50k eV. second electron 3- The released energy might be transferred to another electron which is ejected from atom (if this energy was higher than its ionization energy.) This electron is called ( Auger electron ) Auger effect
  • 4. Auger electron spectroscopy Analytical technique used in the study of surfaces. It is based on the auger effect. Instrumentation of AES : 1- electron gun 2- sample 3- electron energy analyzer 4- electron detector 5- output device
  • 5. Principle of AES : 1- ionization of sample is done by focusing an electron beam toward sample. By using electron gun. 2- emitted electrons are deflected around the electron gun and pass through an aperture towards the back of the Cylindrical mirror analyzer
  • 6. 3- these electron excited es are directed into electron detector which consist of electron multiplier. The second electrons are produced in this step. 4- data is processed by playing different peaks for each sample.
  • 7. Disadvantages of AESAdvantages of AES surface damagesimple analyzer required workhigh sensitivity complicated insulatorsrapid output rate high resolution
  • 8. References : http://www.youtube.com/watch?v=wuyzTGn1rRs http://en.wikipedia.org/wiki/Auger_electron_spectrosc opy http://ac.els-cdn.com/S0169433207004187/1-s2.0- S0169433207004187-main.pdf?_tid=138def9e-aeab- 11e3-bba8- 00000aab0f27&acdnat=1395153734_b49b76af094d7f 844ab1142bf590abf3 http://iopscience.iop.org/1748-0221/8/03/P03020/