DO you guys know anything about ' The Electron Microscope' ?

http://www.unl.edu/CMRAcfem/em.htm


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Where can I find it???

Click the link dude.

http://www.unl.edu/CMRAcfem/em.htm

Click on the link. It's in blue. How many Cheekis are there in your family?

Thank you, Phoenix, Heliotrope and cavfancier for your kind help and welcome!

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Electron Microscope is a really cool rap singer from Orange, NJ. No, wait. I'm thnking of someone lese. Never mind.

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do you mean this game? kidding

If you have any specific questions, then ask... part of my materials and metallurgy course last year involved electron microscopy in detail, both the theory and the practical usage.

Welcome nickjf: True or false; A state of the art electron microscope images molecules well except the hydrogen atoms. It is near worthless for examining the fine structure of smaller atoms. Neil

Well, I can imagine that it would be quite useless at imaging hydrogen atoms, since there isn't much there to deflect the electrons. Similarly, X-ray crystallography doesn't do well with hydrogen atoms. I'd have to check in my notes (I crammed before the exams and promptly forgot most things!), but I believe that both use electron clouds to deflect the beams, and hydrogen, having only one electron which is quite often more "owned" by the other atom to which the H is bonded anyway, would probably have little effect.
But we were more concerned with looking at the structure of materials on a slightly larger scale, ie, grain boundaries, dislocations etc. It was part of a materials sciences course, so we were only looking at things that affected macroscopic properties.
As far as I'm aware, they can not be used to look at the structure of individual atoms at all, small or large.

Thank you nikjf for sort of confirming what I thought. I do a lot of reading between the lines, but that can lead to knowing things that ain't so.
True or false: the Xray (gamma is sometimes used) crystalloghrapy can analyze defects far below the surface, but the electron microscope can only see a few nano meters below the surface, but with better resolution.

You know: FEI RULES (Nickjf knows what I'm talking about, not?).

I don't know if we used FEI stuff or not, although their company logo looks familiar...
I would assume that the sample thickness that can be used, and the resolution, would ultimately depend on the beam energy, but it would make sense to me that X-ray crystallography would be more penetrating with lower resolution. Certainly the X-ray crystallography stuff we did used macroscopic samples, while our EM stuff did not.

Well FEI is a big company, and one of the major companies who make electron microscopes. My dad works at the company, that's why.