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- W2085697613 abstract "The primary ion directional effects observed in secondary electron yields induced by ion bombardment [5 keV Ar + → Cu(100)] are simulated using a semi-empirical molecular dynamics model. The directional effects are presumed to arise from inelastic energy transfers that take place in close binary atomic encounters. The latter are estimated using the Oen-Robinson model, in combination with a critical apsidal distance ( R c ). The connection between the measured kinetic electron emission (KEE) yields ( γ KEE ) and the predicted inelastic energy loss in a binary atomic collision (Δ E i ) is established through a semi-empirical fitting procedure involving R c and other parameters in the following model: γ e = γ 0 + γ KEE = γ 0 + 〈 ΔE i ( z )exp(− z / λ )〉, where z is the collision depth. The directional effects are best reproduced by fitting the model to Ar–Cu inelastic collisions for two azimuthal incident directions: R c is estimated to be 0.47 ± 0.03 Å; the parameter, λ (an effective electron attenuation length), is estimated to be 18 ± 2 Å. The same model also describes the γ KEE energy dependence for 5–10 keV Ar + normally incident on low-index Cu crystal targets [Phys. Rev. 129 (1963) 2409]. The spatial and temporal distributions of the hard collisions that initiate KEE are discussed on the basis of the model. ► Directional Ar + -induced electron yields from Cu are modelled by molecular dynamics. ► The critical Ar–Cu apsidal distance for electron emission is 0.47 ± 0.03 Å. ► The model describes the energy dependence of Ar + –Cu electron yields. ► The spatial distributions of hard inelastic Ar + –Cu collisions are described." @default.
- W2085697613 created "2016-06-24" @default.
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- W2085697613 date "2011-10-01" @default.
- W2085697613 modified "2023-09-24" @default.
- W2085697613 title "Modelling the directional and energy dependence of 5–10keV Ar+ ion-induced secondary electron yields from Cu crystals" @default.
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- W2085697613 doi "https://doi.org/10.1016/j.susc.2011.06.022" @default.
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