SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 94: Poster Session VII: Poster to Mini-Symposium: Electrified solid-liquid interfaces II

O 94.1: Poster

Donnerstag, 4. März 2021, 10:30–12:30, P

Peeling graphite layer by layer to study the charge exchange dynamics of ions inside a solid on the fs time scale — •Anna Niggas¹, Sascha Creutzburg², Janine Schwestka¹, Benjamin Wöckinger¹, Pedro L Grande³, Bernhard C Bayer^4,5, José P Marques⁶, Friedrich Aumayr¹, Robert Bennett⁷, and Richard A Wilhelm¹ — ¹Institute of Applied Physics, TU Wien, Vienna, Austria — ²Institute of Ion Beams and Materials Research, HZDR, Dresden, Germany — ³Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil — ⁴Institute of Materials Chemistry, TU Wien, Vienna, Austria — ⁵Faculty of Physics, University of Vienna, Vienna, Austria — ⁶BioISI - Biosystems & Integrative Sciences Institute, Faculdade de Ciências da Universidade de Lisboa, Lisbon, Portugal — ⁷Department of Physics and Astronomy, University of Glasgow, Glasgow, UK

Charge exchange is one of the many effects taking place when particles penetrate through matter. For a long time experiments were limited to studying secondary particles because observation of the ion inside a solid is not possible. We perform highly charged ion transmission through single-, bi- and trilayer graphene to study the ions’ exit charge state after intaction. Thereby we adress the charge state changes in graphite with monolayer precision. Following our results of two independent approaches, accompanied by a first-principles model on interparticle de-excitation, we find that the ultra-fast neutralisation dynamics depend only on the time the ion interacts with material layers and neutralisation happens primarily in the topmost surface layers.