Charge exchange of medium energy H and He ions emerging from solid surfaces - Couches nanométriques : formation, interfaces, défauts Accéder directement au contenu
Article Dans Une Revue Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Année : 2009

Charge exchange of medium energy H and He ions emerging from solid surfaces

Y. Kitsudo
  • Fonction : Auteur
K. Shibuya
  • Fonction : Auteur
T. Nishimura
  • Fonction : Auteur
Y. Hoshino
  • Fonction : Auteur
Ian Vickridge
Y. Kido
  • Fonction : Auteur

Résumé

Charge exchange of medium energy H and He ions emerging from clean solid surfaces is studied extensively using a toroidal electrostatic analyzer with an excellent energy resolution. The charge distributions of He ions scattered from sub-monolayers near a surface are non-equilibrated, resulting in a surface peak even for poly-crystal solids. By solving simultaneous rate equations numerically, we derive electron capture and loss cross sections for Ni and Au surfaces. Based on a free electron gas model, non-equilibrated He(+) fractions dependent on emerging angle reveals uniform electronic surfaces for metals and corrugated surfaces for Si and graphite with covalent bonds. It is also found that equilibrium charge fractions of H(+) are independent of surface materials (Z(2)) and in contrast equilibrium He(+) fractions depend pronouncedly on Z(2). The data obtained are compared with semi-empirical formulas. (C) 2008 Elsevier B.V. All rights reserved.

Dates et versions

hal-01237487 , version 1 (03-12-2015)

Identifiants

Citer

Y. Kitsudo, K. Shibuya, T. Nishimura, Y. Hoshino, Ian Vickridge, et al.. Charge exchange of medium energy H and He ions emerging from solid surfaces. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2009, 267 (4), pp.566-570. ⟨10.1016/j.nimb.2008.11.010⟩. ⟨hal-01237487⟩
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