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The process of electron multiplication through the bouncing-like acceleratedmotion of electrons inside nanovoids formed owing to external electric fieldsin bulk liquid water is investigated using Monte Carlo simulations inGeant4-DNA. Our results show that the initial charge developed at themetal/liquid interface can be multiplied and expanded along the direction ofthe external electric field on a picosecond timescale, owing to collision-freeinteriors of the nanoruptures. Characteristic features of two differentelectron multiplication mechanisms are revealed and characterized. We find thatelectrons can be accelerated inside cylindrical nanoruptures while bouncing offthe void/water interface. Simulations predict geometric conditions leading tocharge multiplication along the void, rather than electron capture orthermalization in bulk liquid. Our results are consistent with the recentverification of the causal relation between electrostriction-inducedperturbations in bulk liquid, and the subsequent formation of luminousfilaments evidencing the presence of energetic electrons.

Electron multiplication in nanovoids at the initial stage of nanosecond discharge in liquid water