Double resonant neutralization in hyperthermal energy alkali ion scattering at clean metal surfaces

✍ Scribed by A. Sindona; P. Riccardi; S. Maletta; G. Falcone

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 728 KB
• Volume: 267
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2008.11.053

✦ Synopsis

Impact phenomena (including electron spectra and sputtering) Theories and models of many-electron systems Electron states at surfaces and interfaces a b s t r a c t Resonant neutralization of hyperthermal Na þ ions impinging on clean Cuð1 0 0Þ surfaces is studied, focussing on long lived electronic interactions involving the projectile and a target atom. Specific trajectories are considered where the incident particle undergoes multiple collisions within the first surface layers, interacting simultaneously with several target atoms, which leads to single emission of a surface atom that can resonantly exchange charge with both the solid and the projectile. The system is described via a semi-empirical, one-electron potential that includes the effect of a plane metal surface, with projected band gap, the projectile, whose charge state will be eventually investigated, and the substrate atom. On this basis, a model Hamiltonian of the Anderson-Newns type is constructed and the calculated neutralization probability is compared with the angle resolved neutral fraction measured by Keller et al.