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Unformatted text preview: MSE 2020 3/29/2011 Page 1 of 3 I n C lass Presentat ion: Energy Loss Spectroscopy (EE LS) Hillier and Baker 1943 but not widely used till the 90s Inelastically scattered electrons used o They interact with electrons in the sample instead of nuclei (backscattered and elastically scattered) o Therefore, the lose energy (not random) Certain energy loss associated with each electron shell As energy loss increases, intensity decreases 3 types of EELS o High resolution low incident energy (lower weight elements) Vibrational structure of surface o EELS (in between) o Core EELS high enough energy to ionize core elements Sample Prep o Through TEM microscopy, except HREELS o For HREELS, need a very flat surface o Needs to be electrically conducting and grounded Detection limit signal can be detected from a few hundred atoms Kinetic energy of electrons determines deflection in detector and corresponds to certain energy loss Uses o Used to measure concentration of elements o High resolution MSE 2020...
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This note was uploaded on 09/12/2011 for the course MSE 2020 taught by Professor Alamgir during the Spring '09 term at Georgia Institute of Technology.
- Spring '09