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tullatulla

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tullatulla
·2 jaar geleden·discuss
* cannot resolve atoms on a surface, in transmission mode (STEM) and with the right sample, as in the article it's another story.
tullatulla
·2 jaar geleden·discuss
Small correction: Scanning tunneling microscopes can do that. They are basically a very sharp tip scanned across the surface.

Scanning electron microscopes, where a beam of electrons is rastered across the surface can not (yet?) resolve atoms.
tullatulla
·2 jaar geleden·discuss
I believe you can only make playlists available offline. So, you would have to create a playlist containing that single song and then there should be a download button (didn't test it).

What a nightmare.
tullatulla
·2 jaar geleden·discuss
160 wafers per hour, not minute.

Still impressive
tullatulla
·3 jaar geleden·discuss
Well you don't need a bike for walking, so that's gotta count for something (if efficiency is defined as total energy spent per distance)
tullatulla
·3 jaar geleden·discuss
Well, you would need a template with 8x smaller features than a EUV mask (at least in one direction, 4x in the other). Ebeam lithography can in principle do this, but it's at the resolution limit and the shot noise will mean there will be a lot of defects.

A sufficiently defect free EUV mask can be worth >>1E6$, for a nano imprint template this would be much much more and it's lifetime probably a fraction. That's why nanoimprint litho is no alternative to EUV.
tullatulla
·4 jaar geleden·discuss
Can also highly recommend the translated version!
tullatulla
·4 jaar geleden·discuss
What's going on with Figure 1? Caption and legend don't match and bars are stacked? And here I thought Nature has some standards...
tullatulla
·4 jaar geleden·discuss
Definitely a better choice than paracetamol, which is metabolized by the liver...
tullatulla
·4 jaar geleden·discuss
Oh yes you are right!

That's apparently part of the first 1MeV TEM. Should be the high voltage source for the electron gun. The electron optics were most likely magnetic, not electrostatic.

There is a whole movie about it:

https://images.cnrs.fr/en/video/1257

Later MeV TEMs looked very different, and are now replaced by aberration corrected tools...
tullatulla
·4 jaar geleden·discuss
Those have nothing to do with the microscope.

A STM is basically a very sharp needle flying just above the surface and measuring the tunneling current with a few volts applied at most. It's rather small, most space will be taken up by the vacuum chamber and cryostat.

Other electron microscopes (TEM or SEM) cannot resolve molecules / or would fry them with their high voltage/currents...
tullatulla
·5 jaar geleden·discuss
If you don't mind moving to Germany, check out Carl Zeiss (SMT).

We supply the optics to ASML and also make our own semi equipment directly sold to fabs. Lots of growth and interesting challenges at the cutting edge of physics.
tullatulla
·5 jaar geleden·discuss
You would really need a free electron laser to produce sufficient photons at the desired wavelength.

The lower the wavelength, the less photons you have at constant power, so shot noise becomes an issue...