Frank de GROOT
(Debye Institute of Nanomaterials Science, Utrecht University, Netherlands)
Some new developments in x-ray absorption (XAS) and resonant inelastic x-ray scattering (RIXS) will be discussed. An introduction is given of XAS, including the oxygen K edge, metal K edge and metal L edge [1,2].
The second part of the talk deals with resonant inelastic x-ray scattering (RIXS) In 2p3d RIXS one scans through the 2p XAS edge and measures the low energy excitations, including phonons, magnons, dd-excitations and charge transfer. The 100 meV resolved 2p3d RIXS spectra of Ruby (Cr in Al2O3), Fe3O4 and LaCoO3 will be discussed [3,4]. The present experimental resolution of 30 to 100 meV allows the detailed observation of the electronic structure, including the determination of crystal field parameters, covalency parameters and spin-orbit coupling, but also the momentum dependence of magnons and other low energy excitations. Related to the RIXS measurements is the analysis of Fluorescence yield (FY) detected x-ray absorption spectra (XAS), including the intrinsic deviations of FY-XAS spectral shape from the XAS spectrum that is important for measurements with x-ray free electron lasers [5,6].
1- Core Level Spectroscopy of Solids Frank de Groot and Akio Kotani (Taylor & Francis CRC press, 2008)2- Download the x-ray spectroscopy simulation software at http://www.anorg.chem.uu.nl/CTM4XAS/
3- Huang et al. Nature Comm. 8, 15929 (2017).
4- Tomiyasu et al. Phys. Rev. Lett. 119, 196402 (2017)
5- F.M.F. de Groot, Nature Chemistry 4, 766 (2012)
6- Mitzner et al. J. Phys. Chem. Lett. 4, 3641 (2013)
Entrance formalities:
Free access in the auditorium of the Reception building.
If the manifestation takes place in the main building thank you for providing an ID card (to exchange at the reception for an access pass)
Contact: Sandrine Vasseur
Downloads
sem-180309-de-groot.pdf (250.52 KB - pdf) (250.52 KB)