Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
DS: Dünne Schichten
DS 12: Ionen-Festkörper-Wechselwirkung II
DS 12.1: Hauptvortrag
Montag, 7. März 2005, 10:45–11:30, TU HS107
Solid matter under extreme conditions - Electronic excitations by swift highly charged ions — •Gregor Schiwietz — Hahn-Meitner-Institut Berlin, Abt. SF4, Glienicker Str. 100, 14109 Berlin
The kinetic energy of fast ions is transferred virtually only to the electrons of the medium. The individual energy-loss events occur within 10−17 s and typical energy transfers are between a few eV up to several keV. Thus, the energy deposition of a single swift heavy ion, as delivered, e.g., by the ISL cyclotron at the Hahn-Meitner-Institut, is comparable to the giant focussed multi-photon pulse that will be available at the future free-electron laser XFEL.
The talk will address ion-induced electronic excitations inside solids and subsequent atomic rearrangement processes that lead to materials modifications once a certain threshold excitation-density is exceeded. Surface-sensitive experiments under ultra-high vacuum conditions will be presented and snapshots of the short-time evolution are extracted from high-resolution Auger electron spectra for different materials.