Electron tree in a block of plastic

Electron tree in a block of plastic

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This image is part of the feature Centenery Of The Electron


Caption: An 'electron tree' produced in a block of plastic (15 cm square by 2.5 cm thick) by a beam of electrons. The electrons initially penetrate about 0.5 cm into the block & stop. As the number of electrons builds up, however, their mutual electric repulsion begins to force them apart. If the beam is switched off before this happens, a subsequent small tap to the block with a metal punch releases the electrons suddenly & they shoot out, rather like lightning, leaving a pattern of tracks that becomes 'frozen' in the plastic.

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Keywords: black background, discharge, electric discharge, electron, electron tree, formation, lichtenberg figure, particle physics, physical, physics, plastic, tree

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