Functions of Electron Lens in EMs
- Practical Electron Microscopy and Database -
- An Online Book -

http://www.globalsino.com/EM/  



 

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers. You can click How to Cite This Book to cite this book. Please let Dr. Liao know once you have cited this book so that the brief information of your publication can appear on the “Times Cited” page. This appearance can also help advertise your publication.

 

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In electron-optical systems, (as well as light-optical systems), there are two major functions for lens:

i) Lens work as an aperture because it can constraint the incident wave front. This is more easily understood for light-optical systems because the aperture effect is due to the finite surface area of the optical lens;

ii) Lens can change the wave front, meaning after a wave front crossing a lens, the amplitude and phase factor of the wave will change.

 

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