Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8039216 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2018 | 6 Pages |
Abstract
Charge deposition dependences of electron transmission through insulating PET nanocapillaries and a tapered glass microcapillary are reported and differences with HCI transmission are noted. Investigations were conducted for electrons with incident energies 500-1000â¯eV, corresponding to energies per charge similar to those used for HCI studies, incident on (1) an array of PET nanocapillaries (density â¼5â¯Ãâ¯108/cm2) with diameters 100â¯nm in a foil of thickness 12â¯Î¼m, and (2) on a tapered glass microcapillary with inlet/outlet diameters of 800/100â¯Î¼m and a length of â¼35â¯mm. The transmission was measured for incident electrons at small sample tilt angles ranging from 0° to 5° with respect to the beam direction. For most angles, including those near zero degrees, there was an initial quiet period during which essentially no transmission was observed, followed by large rises in the transmission during relatively short periods of charge deposition before equilibrium of the transmission was reached. The resulting equilibrium was stable, blocked or had frequent oscillations depending on the incident energy and the capillary used. Observations for both capillaries show that a negative charge patch is needed to guide incident electrons through the capillaries similar to the manner in which HCIs are guided through capillaries.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
J.A. Tanis, D. Keerthisinghe, S.J. Wickramarachchi, T. Ikeda, N. Stolterfoht,