Lect06_notes

9 cbems 164 xrd sem microanalysis lecture 06 10

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Unformatted text preview: is: Lecture 06 ! 8 Field Emission Gun! !  Field at tip! !  Emission pattern (C)! !  Schematic showing cross-over! ! ! ! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 9 CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 10 Electron – Specimen Interactions! A Detailed Comparison of Electron Gun Types – Tradeoffs! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 11 Electromagnetic Lens Principle! !  Electron beam is deflected by electromagnetic coil! ! ! ! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 12 Electromagnetic Lenses! ! ! ! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 13 CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 14 Demagnification! First crossover! Ideal condenser lens! Back focal l plane! First image plane! Ideal objective lens! Probe (demagnified image of first crossover)! Demagnification! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 15 CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 16 Electron Ray Tracing! Working Distance! ! ! ! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 17 CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 18 Effect of Working Distance! Effect of Condenser Lens Strength! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 19 Imperfections: Lens Aberrations – Spherical and Aperture Diffraction! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 20 Imperfections: Lens Aberrations – Spherical and Aperture Diffraction! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 21 Lens Aberrations – Chromatic Aberration and Astigmatism! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 06 ! 22...
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