From groove to hillocks Atomic-scale simulations of swift heavy ion grazing impacts on CaF.sub.2./sub.

0585127 - FZÚ 2025 RIV NL eng J - Journal Article
Rymzhanov, R.A. - Ćosić, M. - Medvedev, Nikita - Volkov, A.E.
From groove to hillocks Atomic-scale simulations of swift heavy ion grazing impacts on CaF₂.
Applied Surface Science. Roč. 652, April (2024), č. článku 159310. ISSN 0169-4332. E-ISSN 1873-5584
R&D Projects: GA MŠMT(CZ) LM2023068; GA MŠMT LTT17015; GA MŠMT EF16_027/0008215
Institutional support: RVO:68378271
Keywords : electronic excitation * swift heavy ion * grazing irradiation * surface damage * nanostructuring
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 6.7, year: 2022

Surface nanopatterning of CaF2 by swift heavy ions irradiation under oblique angles is studied with a combination of the event-by-event Monte Carlo particle transport model and molecular dynamics simulations. The model describes the electronic system excitation and energy transfer to the lattice followed by the atomic response. The approach allowed us to simulate the kinetics of the electronic ensemble excited by a grazing ion demonstrating that the presence of the surface does not reduce the energy of the lattice as expected. On the contrary, the track core temperature near the surface is slightly higher than in the bulk, because electrons reflected from the surface bring a part of the energy back to the core. The formation kinetics of entire grazing ion tracks is studied revealing the mechanisms of various surface nanostructures formation. The simulated structures are in reasonable agreement with the available experimental data.
Permanent Link: https://hdl.handle.net/11104/0352860