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Indeed, I remembered arc welding as well. However, a typical ripple formation in sputter erosion is more realistic.Metryq wrote:
The OP's photos remind me of the "bead" formed by arc welding. At least as viewed from a long distance.
That's an interesting observation...
O.K. it is gold but look at the pattern here (scroll down to the last picture):
http://www.mikroskopie-forum.de/index.p ... c=18378.15
Some literature about sputtered surfaces (but one must search for the pictures and scroll down)
https://www.uni-oldenburg.de/fileadmin/ ... eview5.pdf
Anyhow it looks like an ion beam was "walking" over the surface.
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- nick c
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https://www.theepochtimes.com/did-a-gia ... 99276.html
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