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picture1_Em2 Gii


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introduction scanning electron microscope zeiss supra 25 sem history instrumentation theory samples results different uses image capture elemental analysis elemental mapping image http www physics montana edu ical instrumentation fesem ...

icon picture PPTX Filetype Power Point PPTX | Posted on 09 Sep 2022 | 3 years ago
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            Introduction
            ■ Scanning Electron Microscope (Zeiss Supra-25 SEM)
                –  History
                –  Instrumentation
                –  Theory
            ■ Samples 
                –  Results & Different Uses
                    ■ Image Capture
                    ■ Elemental Analysis
                    ■ Elemental Mapping
            Image: http://www.physics.montana.edu/ical/instrumentation/fesem.html
            SEM: Brief History
            ■ History
                –  First SEM was built by Manfred von Ardenne in Germany in 1937
                –  First SEM sold commercially 1965 (Cambridge Scientific Instrument Co.)
                –  First SEM in Iceland 1988 (NMI)
                –  The one we used: 2004
              Image: https://www.vonardenne.biz/en/company/manfred-von-
              ardenne/
       Instrumentation
         Electron Gun
         Sample Stage
           Samples under high vacuum
         Camera & Detectors
           Focus the Sample
           X-ray detector
       Image: http://nau.edu/cefns/labs/electron-microprobe/glg-510-class-
       notes/instrumentation/
                 Instrumentation: Interaction Volume
                  
                 •  Depth & Width of the Interaction 
                    Volume
                  
                 •  B
                  
                 •  Distance the electron penetrates the 
                    sample
                 •   r
                 Image: http://nau.edu/cefns/labs/electron-microprobe/glg-510-class-
                 notes/instrumentation/
      Samples
      ■ MUST be conductive
      ■ Preferably flat & non-porous
      ■ Powders, etc. prepared in a conductive Bakelite casting & polished
      ■ If not conducting, must be coated with gold (imaging only)
      ■ Cannot use liquids
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...Introduction scanning electron microscope zeiss supra sem history instrumentation theory samples results different uses image capture elemental analysis mapping http www physics montana edu ical fesem html brief first was built by manfred von ardenne in germany sold commercially cambridge scientific instrument co iceland nmi the one we used https vonardenne biz en company gun sample stage under high vacuum camera detectors focus x ray detector nau cefns labs microprobe glg class notes interaction volume depth width of b distance penetrates r must be conductive preferably flat non porous powders etc prepared a bakelite casting polished if not conducting coated with gold imaging only cannot use liquids...

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