Abstract
Recent measurements of He{sup +} ion fractions that survive to a whole scatterig event when they impinge on Ag surfaces have shown two different and interesting effects: (1) a notable difference of surviving ion fraction depending on which crystallographic face of the target surface is studied [Yu. Bandurin et al., Phys. Rev. Lett. 92, 017601 (2004)], and (2) an uncommonly high ion fraction in the very-low-energy range (tens of eV) [S. Wethekam et al., Phys. Rev. Lett. 90, 037602 (2003)]. Apart from the geometry, one of the differences between the surfaces of a crystal can be seen in the electronic structure: while the (111) surface has an occupied surface state near the Fermi level at the {gamma} point the (110) and (100) faces have not. Motivated by these facts, in this work we study the role that the occupied surface state plays on the Auger neutralization rate and we present an estimation of the ion fractions that survive for the different Ag faces.
Highlights
The neutralization of a singly charged ion in front of a surface occurs when an electron from the solid occupies a hole in the ion, turning it into a neutral atom
In this work we study the role that the occupied surface state plays on the Auger neutralization rate and we present an estimation of the ion fractions that survive for the different Ag faces
In this paper we present results obtained for the Auger neutralization rates and the ion fraction surviving the scattering of He+ ions on different silver surfaces
Summary
The neutralization of a singly charged ion in front of a surface occurs when an electron from the solid occupies a hole in the ion, turning it into a neutral atom. In this work we present results on Auger neutralization rates of He+ ions on different Ag surfaces, as well as, an estimation of the ion fractions surviving to the neutralization. Electronic excitations in the metal are described by the imaginary part of the density response function, Im ͑Q , z1 , z2 , ͒, where ͑Q , z1 , z2 , ͒ represents the 2D Fourier transform of the density response function of the interacting electron system.31 This magnitude accounts for the surface response to an external electric field giving rise to elementary one-particleelectron-hole pairsand collective excitationsbulk and surface plasmons. The final state of the deexcited electron in the Auger neutralization is a bound state of the atom that is near the metal surface.
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