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Nov18-11, 11:49 AM
P: 3,898
Quote Quote by sophiecentaur View Post
So that's an answer. If there are no gas atoms in the way then no avalanche can occur and so, by definition, you can't have an 'arc'. It's just a beam of charges on the move.
I think what he meant is the electron beam striking any surface and cause secondary electrons to be emitted and start the avalanche. When electrons emitted from an electrode, it spray all over.

I better stop talking as I don't know much on this, just kept hearing this all the time, all the secondary electron emission, plasma and all. It is not just vacuum.