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.

English title

Matrix effects in the neutralization of He ions at a metal surface containing oxygen

Type

Peer-reviewed article not indexed in WoS or Scopus

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.

Keywords in English

Low energy ion scattering; LEIS; Charge exchange processes; Surface composition analysis; Metal oxide

Released

2012-12-13

ISSN

0039-6028

Journal

SURFACE SCIENCE

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",
  journal="SURFACE SCIENCE",
  year="2012",
  volume="609",
  number="1",
  pages="167--171",
  issn="0039-6028"
}