Stochastic effects of charge transfer on image interaction and plasmon excitation in ion-surface grazing scattering

We model the charge-state evolution of fast hydrogen-like ions in the course of grazing scattering from metal surfaces by a Markov process with the time-dependent jump coefficients. Using the master equation for charge exchange, we show that the process may be treated as quasi-stationary owing to th...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2005-04, Vol.230 (1-4), p.391-397
Main Authors: Mišković, Z.L., Goodman, F.O., Song, Yuan-Hong, Wang, You-Nian
Format: Article
Language:English
Subjects:
Charge exchange
Grazing scattering
Image interaction
Plasmon excitation
Solid surfaces
Stochastic processes
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Summary:We model the charge-state evolution of fast hydrogen-like ions in the course of grazing scattering from metal surfaces by a Markov process with the time-dependent jump coefficients. Using the master equation for charge exchange, we show that the process may be treated as quasi-stationary owing to the adiabatically slow ion motion in the direction perpendicular to the surface. We further employ the dielectric formalism within the specular reflection model and the plasmon-pole approximation to evaluate the expectation values for the ion-image interaction with the surface and the rate of surface-plasmon excitation. We find that, close to the surface, both these quantities are significantly affected by the projectile-charge fluctuations. In particular, we find a substantial rate of the plasmon excitation for ion velocities well below the threshold implied by the kinematic constraint.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2004.12.072