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Sacha De’Angeli from ChemHacker has released the schematics and source code of the Scanning Tunneling Electron Microscope. The STM is Arduino based and has been a build in progress for quite a long time now. Looks like it is at a great state now! See the Wikipedia page for more generic information about Scanning Tunneling Electron Microscopes. “The STM is based on the concept of quantum tunneling. When a conducting tip is brought very near to the surface to be examined, a bias (voltage difference) applied between the two can allow electrons to tunnel through the vacuum between them. The resulting tunneling current is a function of tip position, applied voltage, and the local density of states (LDOS) of the sample.[4] Information is acquired by monitoring the current as the tip’s position scans across the surface, and is usually displayed in image form. STM can be a challenging technique, as it requires extremely clean and stable surfaces, sharp tips, excellent vibration control, and sophisticated electronics.“
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September 23rd, 2010
From Wikipedia:
“STM can be a challenging technique, as it requires extremely clean and stable surfaces, sharp tips, excellent vibration control, and sophisticated electronics.”
So good luck an keep us posted…
September 23rd, 2010
ArcAttack led me here here: http://www.geocities.com/spm_stm/Project.html Interestingly is still up, though geocities is out. It’s a very similar project but uses an osciloscope rather than an Arduino-to-Pc ‘visualizer’, at least here where I am, I can have acces to an osciloscope easier than an Arduino… though I haven’t tried to build it myself yet, got tons of things from college. The point is, they’re very similar, so check it out. Greetings from Colombia. O.o
September 23rd, 2010
So, how does the piezo element & NeoD magnets perform the scanning? (Sorry if I’m being lazy – is late & I just skim-read the article)
Notice you seem to have 4 wires coming off the piezo – does that flex the element in a kindof X-Y way?
September 23rd, 2010
Gmc, check this: http://www.geocities.com/spm_stm/Disk_Scanner_Exp.html Is not from this very project but the one I stated was *very similar.