basic electron microscopy
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basic electron microscopy

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Introduction . These 3 presentations cover the fundamental theory of electron microscopyIn presentation
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basic electron microscopy

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1. Basic Electron Microscopy Arthur Rowe

2. Introduction These 3 presentations cover the fundamental theory of electron microscopy In presentation #2 we cover: lens aberrations and their importance how we correct for lens astigmatism limits to ultimate resolution of the TEM Interactions of electrons with matter

3. aberrations of electromagnetic lenses

4. spherical aberration

5. coping with spherical aberration

6. chromatic aberration

7. astigmatism

8. astigmatism - arises from:

9. astigmatism - correction:

10. The TEM Column Gun emits electrons Electric field accelerate Magnetic (and electric) field control path of electrons Electron wavelength @ 200KeV ? 2x10-12 m Resolution normally achievable @ 200KeV ? 2 x 10-10 m ? 2?

11. depth of focus - depth of field

12. when electrons hit matter ..

14. when electrons hit matter ..

16. when electrons hit matter ..

18. when electrons hit matter ..


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