Abstract
The size distribution of ${\mathrm{He}}_{\mathit{N}}^{\mathrm{\ensuremath{-}}}$ ions produced by crossing a low energy beam with an uncharged helium cluster beam exhibits a threshold below which no ions are detected. The threshold region is unexpectedly structured, however, and exhibits a sharp ``magic'' mass peak at N=(2.0\ifmmode\pm\else\textpm\fi{}0.1)\ifmmode\times\else\texttimes\fi{}${10}^{5}$ atoms. We suggest that this behavior derives from the dynamics of the conduction band instability which leads to the formation of a metastably trapped bubble electron in the droplet.
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