Publication detail
Matrix effects in the neutralization of He ions at a metal surface containing oxygen
KÜRNSTEINER, P. STEINBERGER, R. PRIMETZHOFER, D. GOEBL, D. WAGNER, T. DRUCKMÜLLEROVÁ, Z. ZEPPENFELD, P. BAUER, P.
Czech title
Matrix effects in the neutralization of He ions at a metal surface containing oxygen
English title
Matrix effects in the neutralization of He ions at a metal surface containing oxygen
Type
journal article - other
Language
en
Original abstract
Charge exchange between He ions and a Ni(111) surface containing oxygen was studied by Low-Energy Ion Scattering, using 1.25 keV He+ as primary ions. The energy resolved yield of positive ions was detected after backscattering from Ni or O for different exposures of Ni(111) to molecular oxygen. Pronounced changes in the neutralization efficiency due to the presence of oxygen are observed for both, the adsorbate phase at low oxygen dose, and the NiO phase at high dose. The presence of O in the surface makes resonant charge transfer in a close collision possible. Evidence for a strong matrix effect is found: O in NiO neutralizes much more efficiently than O in the adsorbate phase. Independently, the different interaction stages of Ni–O and the surface structure were monitored by Photoelectron-Emission-Microscopy and Low-Energy Electron Diffraction.
Czech abstract
Charge exchange between He ions and a Ni(111) surface containing oxygen was studied by Low-Energy Ion Scattering, using 1.25 keV He+ as primary ions. The energy resolved yield of positive ions was detected after backscattering from Ni or O for different exposures of Ni(111) to molecular oxygen. Pronounced changes in the neutralization efficiency due to the presence of oxygen are observed for both, the adsorbate phase at low oxygen dose, and the NiO phase at high dose. The presence of O in the surface makes resonant charge transfer in a close collision possible. Evidence for a strong matrix effect is found: O in NiO neutralizes much more efficiently than O in the adsorbate phase. Independently, the different interaction stages of Ni–O and the surface structure were monitored by Photoelectron-Emission-Microscopy and Low-Energy Electron Diffraction.
English abstract
Charge exchange between He ions and a Ni(111) surface containing oxygen was studied by Low-Energy Ion Scattering, using 1.25 keV He+ as primary ions. The energy resolved yield of positive ions was detected after backscattering from Ni or O for different exposures of Ni(111) to molecular oxygen. Pronounced changes in the neutralization efficiency due to the presence of oxygen are observed for both, the adsorbate phase at low oxygen dose, and the NiO phase at high dose. The presence of O in the surface makes resonant charge transfer in a close collision possible. Evidence for a strong matrix effect is found: O in NiO neutralizes much more efficiently than O in the adsorbate phase. Independently, the different interaction stages of Ni–O and the surface structure were monitored by Photoelectron-Emission-Microscopy and Low-Energy Electron Diffraction.
Keywords in Czech
Low energy ion scattering; LEIS; Charge exchange processes; Surface composition analysis; Metal oxide
Keywords in English
Low energy ion scattering; LEIS; Charge exchange processes; Surface composition analysis; Metal oxide
RIV year
2012
Released
13.12.2012
ISSN
0039-6028
Volume
609
Number
1
Pages from–to
167–171
Pages count
5
BIBTEX
@article{BUT96555,
author="Phillip {Kürnsteiner} and Roland {Steinberger} and Daniel {Primetzhofer} and Dominik {Goebl} and Thorsten {Wagner} and Zdena {Rudolfová} and Peter {Zeppenfeld} and P. {Bauer},
title="Matrix effects in the neutralization of He ions at a metal surface containing oxygen",
year="2012",
volume="609",
number="1",
month="December",
pages="167--171",
issn="0039-6028"
}