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- W3159925379 abstract "Abstract Laser ablation is often simulated by the two-temperature model in which electrons are assumed to be thermalized by laser irradiation, while an explicit representation of interaction between laser-field and electrons is challenging but beneficial as being free from any adjustable parameters. Here, an ab initio method based on the time-dependent density functional theory (TDDFT) in which electron-ion dynamics under a laser field are numerically simulated is examined as a tool for simulating femtosecond laser processing of metals. Laser-induced volume expansion in surface normal directions of Cu(111) and Ni(111) surfaces are simulated by using repeating slab models. The amount of simulated volume expansion is compared between Cu(111) and Ni(111) slabs for the same laser pulse conditions, and the Ni slab is found to expand more than the Cu slab despite the smaller thermal expansion coefficient of Ni compared with Cu. The analyzed electronic excitation and lattice motion were compared to those in the two-temperature model. The threshold fluence to release surface Cu atom deduced from current TDDFT approach is found to be comparable to those of Cu ablation reported experimentally." @default.
- W3159925379 created "2021-05-10" @default.
- W3159925379 creator A5059758215 @default.
- W3159925379 date "2021-07-16" @default.
- W3159925379 modified "2023-09-26" @default.
- W3159925379 title "Direct treatment of interaction between laser-field and electrons for simulating laser processing of metals" @default.
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- W3159925379 doi "https://doi.org/10.1038/s41598-021-94036-4" @default.
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