Frank de Groot is professor of X-ray Spectroscopy in the Department of Chemistry at Utrecht University. His work reflects a concern with the theoretical and the experimental aspects of X-ray spectroscopy, including both fundamental studies and applications. His current interest is in the use of X-ray spectroscopies for the study of the electronic and magnetic structure of condensed matter and heterogeneous catalysts under working conditions.   ( CV)

Publications (the PDF files of all papers can be downloaded) - PhD theses - Google Scholar

X-ray Absorption Spectroscopy

X-ray absorption spectroscopy (XAS) is an important tool to determine the electronic structure of molecules and materials. XAS of solids is complex to analyse as one has to describe both the intra-atomic and inter-atomic interactions. Due to the dominance of the intra-atomic interactions 2p XAS of 3d transition metal oxides can be accurately described with crystal field multiplet and charge transfer multiplet models [1, 2]. For an overview of all x-ray and electron spectroscopies see the book Core Level Spectroscopy of Solids.

Resonant Inelastic X-ray Scattering (RIXS) is an x-ray technique that makes use of a monochromator for both the x-rays that excite the system as well as for the emitted x-rays.  As a photon-in photon-out experiment, RIXS can also be adapted to various working conditions [3].