The transmission and guiding of slow highly charged ions through various insulating nanocapillaries of varying aspect ratios and track densities has attracted considerable attention in recent years. Ions lose negligible energy during the course of guiding and do not appreciably change charge state. In this book transmission and guiding of fast electrons (500 and 1000 eV) through an insulating polyethylene terephthalate nanocapillary (PET) foil has been presented and compared with results for slow ions. Electron guiding is found to decrease faster with both energy and foil tilt angle than for...