Nonthermal acceleration of atoms as a mechanism of fast lattice heating in ion tracks

0559832 - FZÚ 2023 RIV US eng J - Journal Article
Medvedev, Nikita - Volkov, A.E.
Nonthermal acceleration of atoms as a mechanism of fast lattice heating in ion tracks.
Journal of Applied Physics. Roč. 131, č. 22 (2022), č. článku 225903. ISSN 0021-8979. E-ISSN 1089-7550
R&D Projects: GA MŠMT LTT17015; GA MŠMT(CZ) LM2018114; GA MŠMT EF16_027/0008215
EU Projects: European Commission(XE) 654148 - LASERLAB-EUROPE
Grant - others:MOBILITY FZU(XE) CZ.02.2.69/0.0/0.0/16_027/0008215
Research Infrastructure: e-INFRA CZ - 90140
Institutional support: RVO:68378271
Keywords : nonthermal acceleration of atoms * fast lattice heating * electronic cooling * femtosecond laser pulses * electron-phonon coupling
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 3.2, year: 2022
Method of publishing: Limited access
https://doi.org/10.1063/5.0095724

Atomic heating in a solid takes place after an impact of a swift heavy ion within a time of electronic cooling there, i.e., similar to 100 fs. This implies an extremely fast electron-ion energy exchange ( „electron-phonon coupling“) necessary for the production of detected ion tracks. In contrast, laser irradiation experiments and calculations show too slow electron-phonon energy exchange to cause structural changes detected in swift heavy ion tracks in solids. We demonstrate that this contradiction can be resolved by taking into account that electron-phonon coupling is not the sole mechanism of energy exchange between electrons and ions in condensed matter. Excitation of the electronic system alters the potential energy surface of atoms, causing them to accelerate and increase their kinetic energy at ultrashort times. Published under an exclusive license by AIP Publishing.
Permanent Link: https://hdl.handle.net/11104/0333148