Auger effect. puplic

explain auger effect in general

1. Auger electron spectroscopy

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 it’s ionization energy.) This electron is called ( Auger electron ) Auger effect

3. 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

4. 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

5. 3- these electron “excited e’s” 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.

6. Disadvantages of AES Advantages of AES surface damage simple analyzer required work high sensitivity complicated insulators rapid output rate high resolution

7. References : http://www.youtube.com/watch?v=wuyzTGn1rRs http://en.wikipedia.org/wiki/Auger_electron_spectroscopy http://ac.els-cdn.com/S0169433207004187/1-s2.0-S0169433207004187-main.pdf?_tid=138def9e-aeab-11e3-bba8-00000aab0f27&acdnat=1395153734_b49b76af094d7f844ab1142bf590abf3 http://iopscience.iop.org/1748-0221/8/03/P03020/