Berlin 2005 – wissenschaftliches Programm
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A: Atomphysik
A 8: Poster HU 1
A 8.8: Poster
Samstag, 5. März 2005, 08:30–18:30, Poster HU
Transport of highly charged ions through nanoscale capillaries — •Frances Allen1, Thomas Schenkel2, Arun Persaud2, and Sang-Joon Park2 — 1Institut für Physik der Humboldt-Universität zu Berlin, Lehrstuhl Plasmaphysik, Newtonstraße 15, D-12489 Berlin, Germany — 2E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
The transmission of highly charged ions through nanoscale capillaries is investigated. Our goal is to extend previous work in the field and to obtain benchmark data for the single ion implantation technique being developed at Lawrence Berkeley National Laboratory.
When a highly charged ion approaches a solid surface valence electrons from the target are resonantly captured into Rydberg states of the ion. This process is described by the classical over-the-barrier model which is widely used to estimate the critical distance for charge transfer.
Relatively slow multiply charged ions (eg 0.3 keV/u Ar3+) from a sputter gun ion source and highly charged ions (eg 3 keV/u Xe44+) from an Electron Beam Ion Trap are directed onto capillary targets. These are silicon nitride membranes of thickness 200-500 nm into which arrays of holes of diameter 50-300 nm have been drilled using a Focussed Ion Beam system. The ion beam transported through the capillaries is analyzed via electrostatic charge state separation and subsequent position sensitive detection with a resistive anode microchannel plate detector.
A description of the experimental set-up is given together with a selection of results and a comparison with theoretical values.