MSE2020LectureNotes_2_22

MSE2020LectureNotes_2_22 - MSE 2020 2/22/2011 Page 1 of 6 E...

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Unformatted text preview: MSE 2020 2/22/2011 Page 1 of 6 E lect ron M ic roscopy Theoretical resolution is sub-nanometer o Not typically the case Lensing system variable refractive index material (magnetic field perpendicular to pate of electrons o Spiral motion of electrons in field Source emission crystal (typically W or LaB 6 ) Magnetic coils = lens TEM came first (1939) o Imaging in a plane past the sample (very analogous to OM) o Surface composition info MSE 2020 2/22/2011 Page 2 of 6 o Incident electrons electrons from electron gun o Auger electrons surface analysis o Secondary electrons imaging o Backscattered electrons EBSD, SAC-Pattern, imaging o X-rays Kossel Technique, chemical analysis o Elastically scattered electrons SAD-point diagram, dark field imaging o Inelastically scattered electrons Kikuchi diagrams Auger electrons are excited by electrons falling back down radiatively o Low kinetic energy o Reabsorbed quickly MSE 2020 2/22/2011 Page 3 of 6 Backscattered electrons are used for imaging o Suffer essentially/nearly zero energy loss...
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MSE2020LectureNotes_2_22 - MSE 2020 2/22/2011 Page 1 of 6 E...

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