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HK: Hadronen und Kerne

HK 19: Application of Nuclear Techniques I

HK 19.7: Talk

Monday, March 16, 1998, 18:30–18:45, G

A Scanning Nanoprobe Utilizing High Energy Ions — •G. Datzmann, G. Dollinger, C. Goeden, O. Schmelmer, and H.-J. Körner —
Physik-Department E12, TU-München, 85748 Garching

A new nanoprobe for energetic ions (e.g. 25 MeV protons) will be installed at the Munich Tandem accelerator. Therefore a superconducting multipole lens has been designed to achieve a beam diameter of 100 nm at the focal plane [1]. The facility aims to investigate special topics concerning solid state physics, biology and medicine. Compared to electron microscopy and microprobes using ions of lower energy, this method provides a reduced angular straggling in thick targets (> 1 µm). Furthermore the high ion energies enable new experimental techniques. A 25 MeV protonbeam for example offer a good possibility for the detection of hydrogen in submicron dimensions, using coincident detection of elastic proton-proton-scattering events. Scanning Transmission Ion Microscopy (STIM)-experiments with heavy ions belong to another type of experiments planned for this facility. Due to the high stopping power of heavy ions in matter and a large 90^∘ magnetic analyser, it will be able to perform thickness or density measurements with a high accuracy.

[1] G. Dollinger et al., NIM B, 130 (1997) 51