  Electron ionization of helium droplets doped with cesium or potassium results
in doubly and, for cesium, triply charged cluster ions. The smallest observable
doubly charged clusters are $Cs_{9}^{2+}$ and $K_{11}^{2+}$; they are a factor
two smaller than reported previously. The size of potassium dications
approaches the Rayleigh limit nRay for which the fission barrier is calculated
to vanish, i.e. their fissilities are close to 1. Cesium dications are even
smaller than nRay, implying that their fissilities have been significantly
overestimated. Triply charged cesium clusters as small as $Cs_{19}^{3+}$ are
observed; they are a factor 2.6 smaller than previously reported. Mechanisms
that may be responsible for enhanced formation of clusters with high
fissilities are discussed.
