Lect07_notes

8 effect of working distance effect of condenser lens

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Unformatted text preview: EM & Microanalysis: Lecture 07 ! 8 Effect of Working Distance! Effect of Condenser Lens Strength! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 07 ! 9 Imperfections: Lens Aberrations – Spherical and Aperture Diffraction! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 07 ! 10 Lens Aberrations – Chromatic Aberration and Astigmatism! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 07 ! 11 CBEMS 164 – XRD, SEM & Microanalysis: Lecture 07 ! 12 Astigmatism and Corrections! Electron – Specimen Interactions! Imagine a fireworks display! ! Electron Beam impinges on bulk samples! ! A myriad of signals (electrons, x-rays, photons) are created, and ejected from the sample surface in all directions! ! ! !  Detectors in certain locations detect some of these signals! !  !  The detected signals (and their respective intensities) are used to modulate the intensity (brightness) of a pixel in a chosen display! ! ! ! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 07 ! 13 CBEMS 164 –...
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This note was uploaded on 01/16/2014 for the course CBEMS 164 taught by Professor Porter,j during the Fall '08 term at UC Irvine.

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