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Research fields

Catalysis and surface oxidation

This project involves studies of atomic processes in model systems in order to obtain a fundamental understanding of the material, its electronic structure and important surface processes. Studies of catalytic processes on model surfaces involve systems such as metals, oxides, metallic clusters and nanostructures on surfaces. We are involved in several networks on catalysis research which are funded by VR, SSF and NordForsk.

Project leaders: Dr Johan Gustafson and Prof Edvin Lundgren

Semiconductor nanostructure analysis

We develop and use methods for analysis of nanostructures with highest possible spatial and temporal resolution. One aim of this research is to understand the role of the surfaces and interfaces for their function and properties. Another goal is to study devices under as realistic conditions as possible. The aim is both fundamental physical understanding as well as enabling the design of novel devices. We study primarily semiconductors for light-emitting diodes, solar cells, low-energy electronics, and computation.

To this end, we use a wide range of X-ray methods at different synchrotrons, including MAX IV in Lund as well as ESRF and PETRA-III, ultrafast lasers at Lund Laser Centre, and a variety of high resolution scanning probe microscopes maintained by our division, including Sweden’s largest facility for scanning tunneling microscopy. We collaborate with many other researchers in particular within NanoLund, elsewhere at Lund University, and internationally.

Project leaders: Dr. Rainer Timm , Dr. Jesper Wallentin and Professor Anders Mikkelsen.

High-pressure X-ray photoelectron spectroscopy

Electron spectroscopy has provided much of our current knowledge on the chemical and physical processes involved in the complex interactions between a solid surface and its surroundings. Such processes are important for surface catalysis and corrosion, for example.

As the surface state depends strongly on its environment, it is vital that such studies are performed under realistic in situ and/or operando conditions. Recently, HP-XPS has been introduced as a powerful method to approach such questions due to the sensitivity to the chemical state of the substrate as well as of the adsorbates. Whereas it is not possible to perform electron spectroscopy at realistic pressures for industrial catalytic reactions, the maximum pressure of 25 mbar is in most cases sufficient for modeling real reaction conditions.

The SPECIES instrument at MAX-Lab is a key infrastructure for this project. The HIPPIE beam line is being designed for the future MAX IV ring.

Project leaders: Dr Jan Knudsen and Professor Joachim Schnadt.
Further information

Atomic, molecular and cluster dynamics

We are interested in understanding the photoionization of atoms, molecules, and clusters. The group is involved in experiments using synchrotron radiation where core electron excitation is an important start for dynamic processes resulting in fragmentation. We have a long history in electron spectroscopy of atoms, molecules and clusters and now imaging experiments where electrons or ions are detected have been developed within the group.

Most of the soft x-ray experiments were carried out at MAX-Lab and nowadays at MAXIV laboratory.  Time-resolved studies are carried out in collaboration with scientists at the Lund Attosecond Science Center using the attosecond light sources from Lund Laser Center.

Project leaders: Dr Mathieu Gisselbrecht and Professor Stacey Sörensen

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