Dresden 2017 – wissenschaftliches Programm
CPP 49.17: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P2-OG1
Surface Modifications of Various Ionic Fluoride Single Crystals by Slow Highly Charged Ions — •Ayman S. El-Said1, Richard A. Wilhelm2,3, René Heller2, Friedrich Aumayr3, and Stefan Facsko2 — 1Physics Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia — 2Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany — 3Institute of Applied Physics, TU Wien, 1040 Vienna, Austria
The creation of surface nanostructures is of high importance for today's nanoelectonics and nanophotonics applications. Slow highly charged ions (HCI)have demonstrated their uniqueness and effectiveness in the formation and control of nanostructures in various materials. Here, we focus on the surface modifications induced by HCI in alkali (LiF) and alkaline-earth (CaF2 and BaF2) fluoride single crystals. The surfaces were irradiated with HCI of different charge states and kinetic energies. In case of CaF2 and BaF2, only one type of nanostructures (hillocks) was observed after surpassing certain potential energy thresholds for the incident HCI. For LiF, HCI were able to create three types (pits, calderas, and hillocks) of nanostructures by varying the impinging ions' charge states, or microscopically the locally deposited potential energy. The results are discussed in terms of defect-mediated desorption and thermal spike models.