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Title: Energy loss of keV fluorine ions scattered off a missing-row reconstructed Au(110) surface under grazing incidence

Abstract

A joint experimental and theoretical study of energy loss is presented for 1-to-4-keV fluorine negative ions in grazing scattering on a missing-row reconstructed Au(110) surface. Measurements of energy losses for various azimuthal orientations of the crystal have been performed by means of a time-of-flight method with a pulsed beam. The dependence of the fraction of surviving negative ions on azimuthal angles, was determined. Our energy-loss data are discussed in light of trajectory and stopping-power calculations, where the explicit inclusion of the nonuniform electron density at the surface provides good agreement with the experimental data. The simulation allows us to delineate various trajectory classes that correspond to different contributions in the energy-loss spectra for various azimuthal orientations of the surface.

Authors:
 [1];  [2]; ;  [1]; ;  [3]
  1. Institut des Sciences Moleculaires (Unite Mixte de Recherche CNRS Universite, UMR 8214), bat 351, Universite de Paris Sud, Orsay F-91405 (France)
  2. (China)
  3. Department of Physics, Universidad Tecnica Federico Santa Maria, Valparaiso, Casilla 110-V (Chile)
Publication Date:
OSTI Identifier:
21541303
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 83; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.83.032901; (c) 2011 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 74 ATOMIC AND MOLECULAR PHYSICS; ANIONS; BEAMS; COORDINATES; CRYSTALS; ELECTRON DENSITY; ENERGY LOSSES; ENERGY-LOSS SPECTROSCOPY; EXPERIMENTAL DATA; FLUORINE; FLUORINE IONS; GOLD; INCIDENCE ANGLE; KEV RANGE; SCATTERING; STOPPING POWER; SURFACES; TIME-OF-FLIGHT METHOD; CHARGED PARTICLES; DATA; ELECTRON SPECTROSCOPY; ELEMENTS; ENERGY RANGE; HALOGENS; INFORMATION; IONS; LOSSES; METALS; NONMETALS; NUMERICAL DATA; SPECTROSCOPY; TRANSITION ELEMENTS

Citation Formats

Chen, L., School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, Shen, J., Esaulov, V. A., Valdes, J. E., and Vargas, P.. Energy loss of keV fluorine ions scattered off a missing-row reconstructed Au(110) surface under grazing incidence. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.83.032901.
Chen, L., School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, Shen, J., Esaulov, V. A., Valdes, J. E., & Vargas, P.. Energy loss of keV fluorine ions scattered off a missing-row reconstructed Au(110) surface under grazing incidence. United States. doi:10.1103/PHYSREVA.83.032901.
Chen, L., School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, Shen, J., Esaulov, V. A., Valdes, J. E., and Vargas, P.. Tue . "Energy loss of keV fluorine ions scattered off a missing-row reconstructed Au(110) surface under grazing incidence". United States. doi:10.1103/PHYSREVA.83.032901.
@article{osti_21541303,
title = {Energy loss of keV fluorine ions scattered off a missing-row reconstructed Au(110) surface under grazing incidence},
author = {Chen, L. and School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000 and Shen, J. and Esaulov, V. A. and Valdes, J. E. and Vargas, P.},
abstractNote = {A joint experimental and theoretical study of energy loss is presented for 1-to-4-keV fluorine negative ions in grazing scattering on a missing-row reconstructed Au(110) surface. Measurements of energy losses for various azimuthal orientations of the crystal have been performed by means of a time-of-flight method with a pulsed beam. The dependence of the fraction of surviving negative ions on azimuthal angles, was determined. Our energy-loss data are discussed in light of trajectory and stopping-power calculations, where the explicit inclusion of the nonuniform electron density at the surface provides good agreement with the experimental data. The simulation allows us to delineate various trajectory classes that correspond to different contributions in the energy-loss spectra for various azimuthal orientations of the surface.},
doi = {10.1103/PHYSREVA.83.032901},
journal = {Physical Review. A},
number = 3,
volume = 83,
place = {United States},
year = {Tue Mar 15 00:00:00 EDT 2011},
month = {Tue Mar 15 00:00:00 EDT 2011}
}
  • We have made systematic measurements of scattered projectile charge-state distributions for multicharged He, N, Ne, Na, and Ar ions grazingly incident on a Au(110) single-crystal target. For projectiles whose neutral binding energies lie below the valence band (N, Ar, He, and Ne), observed 1+ charge fractions were small at low velocities and steeply increased above well-defined threshold velocities. However, for Na projectiles with neutral binding energy above the Fermi level, a large (about 84{percent}) 1+ charge fraction was found. The velocity dependence of the Na neutral fraction shows a {open_quote}{open_quote}kinematic resonance{close_quote}{close_quote} due to the virtual population of electronic states abovemore » the Fermi level in the projectile rest frame. The measured sample temperature dependence of the scattered 1+ charge fraction for Ne{sup 9+} projectiles incident along the [110] surface channeling direction reveals a significant decrease in projectile neutralization once the (2{times}1)-(1{times}1) phase transition temperature of the Au(110) surface at 650 K has been reached. {copyright} {ital 1996 The American Physical Society.}« less
  • We have used the time-of-flight technique to measure the energy loss for 51-keV argon ions scattered grazingly from a smooth highly oriented pyrolytic graphite surface. The energy loss has been measured for several impact angles and two charge states, q=2+ and q=16+. Our data indicate that the image charge acceleration in the front of the surface, which increases the effective impact angle of the projectile, affects the energy loss. After correcting for this effect, the energy loss does not depend on the initial charge state of the projectile but increases with increasing the angle of incidence. This indicates a fullmore » neutralization of the projectile before it reaches the distance of the closest approach. The experimental results agree approximately with predictions of a modified Firsov model. {copyright} {ital 1997} {ital The American Physical Society}« less
  • Within the framework of the classical over-barrier model, energy loss, electron emission, and x-ray emission of slow highly charged ion Ar{sup q+} grazing on the Al(111) single-crystal surface under various azimuthal angles have been studied. The enhancement of energy loss, potential electron emission yields, intensity of KL{sup 1} satellite lines, or x-ray yields for the Ar{sup 17+} ion grazing along low-index crystallographic directions was observed. The calculated energy-loss spectra of atomic projectiles Ar{sup 0} interacting with metallic surface agree reasonably well with experiment. The inner-shell filling contributions through the side feeding mechanism, Auger transitions, and the radiative decay process aremore » discussed by analyzing the final charge-state distributions of the reflected ions, potential electron emission yields, and x-ray yields under different azimuthal angles.« less
  • We report on energy loss measurements and charge state distributions for 60 keV N{sup 6+} and 75 keV N{sup 5+} ions scattered off a Pt(110)(1x2) single crystal surface. In particular, the influence of surface steps on the energy loss and the outgoing charge states is discussed. The scattering angle and the angle of incidence are varied. We use grazing incidence conditions, i.e., the momentum perpendicular to the surface is low enough to prevent penetration through the first atomic layer. Image charge effects are observed leading to an additional projectile acceleration towards the surface. Outgoing charge states are detected from 1+more » up to 3+. Axial channeling conditions are defined by scattering along the azimuthal [001] direction, i.e., the projectiles are guided along the [001]-atomic rows. The energy loss for axial channeling is found to be somewhat larger and the energy distribution to be broadened in comparison with the spectra for planar channeling conditions. The broadening is attributed to the interaction of the projectiles with the side wall potentials of the surface channels. We find a strong increase in the energy loss with increasing scattering angle, which exceeds the calculated contribution of the elastic energy transfer by orders of magnitudes. These increased energy losses are attributed to the interaction of the ions with the surface steps.« less
  • The surface scattering of kilovolt-energy ions and atoms at glancing-incidence angles has contributed substantially to knowledge of elementary electronic excitations in the interface region. We consider the influence of inelastic exchange of mechanical energy, due to recoil of the target atoms, on the distribution of scattered projectile atoms. Although with a glancing-incident-angle geometry the relative energy loss by this mechanism is small, it can have a substantial effect on the angular distribution of the scattered particles. These conclusions are supported by numerical calculations of energy losses and scattered particle distributions.