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Site LocationWhile they are not complex, they are sensitive*. So positioning your electron microscope next to the M25 is possibly a bad move*. Even a corridor next to the apparatus will give you large amounts of noise - or even talking. So, before you begin construction, consider your position carefully. It'll also help if you plonk the whole thing in a bell jar to keep vibrations out.
The electron 'needle'The STM*works by having a fine needle as an electrode across a tiny gap to the surface. So you need a very fine needle, right? Wrong. Even at top research universities, the needles are remade every day... not because of accuracy problems, but because it is ridiculously simple.
Building your needle
- Get a piece of electrical wire
Take a single thread of it, so it's about 1mm wide.
Get some pliers
Cut end of wire at 45o