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Communication Dans Un Congrès Année : 2018

Energy loss and inelastic diffraction of fast atoms at grazing incidence

Résumé

The diffraction of fast atoms at grazing incidence on crystal surfaces (GIFAD) was first interpreted only in terms of elastic diffraction from a perfectly periodic rigid surface with atoms fixed at equilibrium positions. Recently, a new approach has been proposed, referred here as the quantum binary collision model (QBCM). The QBCM takes into account both the elastic and inelastic momentum transfers via the Lamb-Dicke probability. It suggests that the shape of the inelastic diffraction profiles are log-normal distributions with a variance proportional to the nuclear energy loss deposited on the surface. For keV Neon atoms impinging on a LiF(001) surface under an incidence angle θ, the predictions of the QBCM in its analytic version are compared with numerical trajectory simulations. Some of the assumptions such as the planar continuous form, the possibility to neglect the role of lithium atoms and the influence of temperature are investigated. A specific energy loss dependence ∆E ∝ θ 7 is identified in the quasi-elastic regime merging progressively to the classical onset ∆E ∝ θ 3. The ratio of these two predictions highlights the role of quantum effects in the energy loss.
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Dates et versions

hal-02049406 , version 1 (26-02-2019)

Identifiants

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Philippe Roncin, Maxime Debiossac, Hanene Oueslati, Faycal Raouafi. Energy loss and inelastic diffraction of fast atoms at grazing incidence. IISC-22,International Workshop on Inelastic Ion Surface Collisions, S. Facsko, Sep 2017, Dresden, Germany. ⟨10.1016/j.nimb.2018.04.026⟩. ⟨hal-02049406⟩
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