Page Areas:



Current Submenu:

Additional Information:

Campusplan

Location of the Physics Building

How to find us ...  more of Campusplan (Titel)


Position Indication:

Content

Peter Bauer

a.Univ.-Prof. Dr. Peter Bauer

a.Univ.-Prof. Dr. Peter Bauer (Back to Team Overview)
Associate Professor

P 119
Phone: +43 732 2468 5336
Fax: +43 732 2468 5315
peter.bauer(/\t)jku.at

Tab Navigation appendant to Information

At the High School I got a profound education in Latin and Greek and even Mathematics and Physics, and learnt to esteem beauty beyond its actual usefulness. I got my diploma in physics with a thesis on Rutherford Backscattering (1975, Linz). Then I joined the surface science group of the Max-Planck Institut für Plasmaphysik to receive my PhD on spin polarization in LEED with Dietrich Menzel (1980, TU Munich).
Back in Linz, I studied electronic stopping of ions in solids (metals, insulators) and gases to learn about the contribution of valence electrons. In order to develop an adequate theoretical model (e.g. electronic stopping of protons in gaseous or metallic Mg) I cooperated with Pedro Echenique´s group (San Sebastián). In 1993 I habilitated on this subject and then focused on studying electronic stopping of slow ions in large band gap insulators. Thus, I got involved in computer simulations of ion scattering which helped to understand RBS beyond the single scattering model and to comprehend the energy resolution of semiconductor detectors.
In 2000, I started to study low energy ion scattering (LEIS); at the moment I am working on the neutralisation of noble gas ions at surfaces (poly- and single crystals) and on the application of LEIS to quantitative analysis of sub-nanometer layers, enjoying science and the possibility of local and international cooperations.

Facts and Numbers:

  • born on 3.6.1952 in Linz; married, four children (born between 1977 and 1997)
  • Humanistic High School in Linz (1970)
  • Studies of Technical Physics in Linz (1970 – 1975)
  • Diploma: 1975
  • PhD: Technical University Munich and MPI für Plasmaphysik Garching (1980)
  • Habilitation: University Linz (1993)

Research Interests:

  • Low energy ion scattering (neutralisation of noble gas ions at surfaces, quantitative analysis of sub-nanometer layers);
  • Atomic Force Microscopy (mainly for technical films and foils);
  • Electronic stopping of ions (band gap effect for insulators);
  • Rutherford backscattering (mainly for analysis of technical samples);
  • Monte-Carlo computer simulations (understanding of analytical tools beyond oversimplifying models).

Current research projects:

  • Neutralization in Low Energy Ion Scattering (LEIS)
    LEIS is a widely used technique to analyze quantitatively the composition and the structure of surfaces of polycrystalline samples and of single crystals [1]. This requires understanding of the charge exchange between projectile and surface, because of its strong influence on the intensity of scattered ions. It is a matter of fact but not yet understood, that in general neutralization is – for a given type of projectile - just an atomic property of the scattering centre and does not depend on presence of other types of atoms in the surface (absence of matrix effects).
    Since 2000, we are studying neutralization of He+ ions. Our main aim is to improve on the one hand the physical understanding of relevant charge exchange processes [2]. On the other hand, we want to improve the comprehension of the scattering process (multiple scattering, channelling, …) which is important for quantitative analysis of ultra-thin films [3].
    Recently, we studied neutralization of positive He ions backscattered from different single- and poly-crystals. On the basis of these results we can better understand the absence of matrix effects in LEIS [4,5].
  • Electronic Stopping of Slow Light Ions in band-gap materials
    This study aims at a more profound physical understanding of the electronic interaction of ions (H+, He+) at low energies (below 10 keV) in band-gap materials, which are the basis of the slowing down process.
    While the slowing down process (“electronic stopping”) is is well understood for simple metals like Al, the electronic stopping of slow ions in metals with a more complex electronic structure like gold and in a large band-gap insulator like Lithium fluoride is not well understood. Our contributions help to elucidate the physical processes relevant for electronic stopping in these materials [4-7].

Other Interests:

people and cultures (consequently also travelling); to live and to philosophise on life; books;
biking, skiing, hiking tours; last, but not least family life.

References

  1. H.H. Brongersma, M. Draxler, M. de Ridder, P. Bauer
    Surface composition analysis by low-energy ion scattering
    Surf. Sci. Rep. 62 (2007) 63
  2. M. Draxler, R. Gruber, H. H. Brongersma, P. Bauer
    Velocity Scaling of Ion Neutralization in Low Energy Ion Scattering
    Phys. Rev. Lett. 89 (2002) 263201.
  3. D. Primetzhofer, S.N. Markin, R. Kolarova, M. Draxler, R. Beikler, E. Taglauer, P. Bauer
    On the surface sensitivity of angular scans in LEIS
    Nucl. Instr. Meth. B 258 (2007) 36
  4. S. Markin, PhD thesis, Johannes Kepler Universität Linz (2007)
  5. D. Primetzhofer, PhD thesis, Johannes Kepler Universität Linz (2010).