Trajectory-dependent energy loss for swift He atoms axially scattered off a silver surface

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:340

Article; Proceedings Paper

Rubiano, C. A. Rios¹  Bocan, G. A.^2,3  Juaristi, J. I.^4,5,6  Gravielle, M. S.¹ 

[1] CONICET UBA, Inst Astron & Fis Espacio, RA-1428 Buenos Aires, DF, Argentina

[2] Comis Nacl Energia Atom, Ctr Atom Bariloche, San Carlos De Bariloche, Rio Negro, Argentina

[3] Consejo Nacl Invest Cient & Tecn, San Carlos De Bariloche, Rio Negro, Argentina

[4] Univ Basque Country, Fac Quim, Dept Fis Mat, San Sebastian 20018, Spain

[5] DIPC, San Sebastian 20018, Spain

[6] CSIC UPV EHU, CFM MPC, San Sebastian 20018, Spain

关键词: Energy loss;    Grazing incidence;    Metal surface;   

DOI  :  10.1016/j.nimb.2014.07.032

来源: Elsevier

【 摘 要 】

Angle- and energy-loss-resolved distributions of helium atoms grazingly scattered from a Ag(110) surface along low indexed crystallographic directions are investigated considering impact energies in the few keV range. Final projectile distributions are evaluated within a semi-classical formalism that includes dissipative effects due to electron hole excitations through a friction force. For mono-energetic beams impinging along the [1 (1) over bar0], [1 (1) over bar2] and [001] directions, the model predicts the presence of multiple peak structures in energy-loss spectra. Such structures provide detailed information about the trajectory-dependent energy loss. However, when the experimental dispersion of the incident beam is taken into account, these energy-loss peaks are completely washed out, giving rise to a smooth energy-loss distribution, in fairly good agreement with available experimental data. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free