Speaker: Frank de Groot, Utrecht University
Program Description
New developments in x-ray absorption (XAS) and resonant inelastic x-ray scattering (RIXS) will be discussed [1,2]. In 2p3d RIXS one scans through the 2p XAS edge and measures the optical excitation range.[3]. The present experimental resolution of ~30 meV allows the detailed observation of the electronic structure, including the determination of crystal field parameters, covalency parameters and spin-orbit coupling. It is possible to combine RIXS and magnetic circular dichroism in RIXS-MCD experiments, both in the soft and hard x-ray range [4]. The options of angular dependent RIXS measurements open many new opens to study details of the electronic and magnetic structure of transition metal systems [5].
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- Core Level Spectroscopy of Solids
Frank de Groot and Akio Kotani (Taylor & Francis CRC press, 2008) - Download the x-ray spectroscopy simulation software at http://www.anorg.chem.uu.nl/CTM4XAS/
- H.Y. Huang et al. Spin-orbital excitations in magnetite (submitted), arXiv:1512.07957
- M. Sikora et al., Phys. Rev. Lett. 105, 037202 (2010)
- H. Elnaggar et al. (unpublished)
Bio
Frank de Groot is professor of X-ray Spectroscopy in the Debye Institute of Nanomaterials Science at Utrecht University, Netherlands.
His work reflects a concern with both 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, in particular for transition metal oxides, nanoparticles and heterogeneous catalysts under working conditions. In July 2009, he won the IXAS Edward Stern Outstanding Achievement Award recognizing the fundamental contributions to X-ray spectroscopy. He has published 220 papers. (16502 citations, h-index 65; cf. google scholar). His present group at Utrecht University consists of 4 post-doc and 7 PhD students.
Frank de Groot studied Chemistry at the University of Nijmegen, with specialization Theoretical Chemistry. In 1991 he received his Ph.D. degree (cum laude) also from the University of Nijmegen under supervision of John Fuggle. The title of his thesis was 'X-ray absorption spectroscopy of transition metal oxides'. From 1992, he was a postdoctoral fellow at the LURE Synchrotron in Orsay, France. In 1995, he became a Royal Netherlands Academy of Arts (KNAW) fellow at the University of Groningen, under supervision of George Sawatzky. He obtained a personal VIDI grant from the Netherlands Organization for Scientific Research (NWO) in 2001. In 2006 he was awarded the NWO VICI grant and in 2013 the ERC advanced grant.
