Stopping of swift hydrogen diclusters: oscillator model

• Published in: The European physical journal. D, Atomic, molecular, and optical physics Vol. 61; no. 1; pp. 39 - 50
• Main Authors: Sigmund, P., Schinner, A.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 2011; EDP Sciences
• Subjects: Applications of Nonlinear Dynamics and Chaos Theory; Atomic; Atomic and molecular clusters; Atomic and molecular collision processes and interactions; Atomic and molecular physics; Beams (radiation); Clusters; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Density; Exact sciences and technology; Mathematical models; Molecular; Optical and Plasma Physics; Oscillators; Physical Chemistry; Physics; Physics and Astronomy; Polarization; Proximity effect (electricity); Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions; Quantum Information Technology; Quantum Physics; Scattering of atoms, molecules and ions; Screening; Silicon dioxide; Spectroscopy/Spectrometry; Spintronics; Studies of special atoms, molecules and their ions; clusters; Superconductivity; Plasmon Excitation; Oscillator Model; Target Electron; Internuclear Distance; Shell Correction; Screening; Polarization; Hydrogen; Ion-surface impact; Silicon Oxides; Binary compounds; Proximity effect; Experimental study; Molecular ions; Silica; Harmonic oscillators
• ISSN: 1434-6060; 1434-6079
• DOI: 10.1140/epjd/e2010-10144-9

. Enhanced stopping of swift hydrogen diclusters has been analysed theoretically. The target has been modeled as a gas of harmonic-oscillator atoms of variable density. This model predicts a proximity effect, i.e., enhanced stopping at high beam energy, and an oscillatory behavior at low energy. Both features get less pronounced with increasing target density due to increased screening of the ion-target interaction by polarization of the medium. Static screening by electrons accompanying the cluster likewise reduces the proximity effect. The Barkas-Andersen correction has been estimated in the limit. Our findings are in contrast with measurements on SiO 2 [S.M. Shubeita et al., Phys. Rev. B 77 , 115327 (2008)] which showed a pronounced step in the energy dependence of the proximity effect.