Workshop on Fundamental Aspects of X-ray Spectroscopies
FXS-2017 - October 9, 10 & 11 2017 - Utrecht


Practical information

You are very welcome to participate.

To register send an email to;

There is no conference fee.



This meeting is intended as a continuation of the meetings on X-ray Spectroscopies in Lausanne 2008 and Utrecht in 2013.

A different workshop

The aim of the workshop is not to just show the latest new results, but rather to identify problems in the description of core shell spectra and to discuss the status of theoretical simulations. The format of the workshop is informal and we hope for lively discussions. While the considerable progress in theoretical modelling of core level spectra during the past decades documents the better understanding of electronic structure, we would like to focus during the workshop on cases where to date all theories fail or where no consensus among theorists on the correct approach has been achieved. 

Topics (open for discussion)

K edge

     ·        ground state electronic structure (DFT, XC-potentials, U, orbital polarization, local dd-interactions, SIC, QC methods)

·        core hole effects (full core hole, fractional core hole, self-consistent field, ‘many-body-modified’ core hole)

·        TD-DFT and BSE (including their approximations)

·        Dipole approximation (derivation, dipole-quadrupole coupling)

·        Non-local screening (split between local 3d states and 3d states of neighbour)

 L edge

·        Local dd-interactions, charge transfer (ligand-metal (LM), MM, ML channels)

·        2p3d plus 2p4s and continuum

·        Spin-orbit coupling, exchange interactions, distortions

 Non-radiative decay

·        Quantitative calculations and experiments

·        Calculate super-Coster-Kronig decay

·        State dependent non-radiative decay

·        What part of the intrinsic broadening is due to lifetime (separate Lorentzian and Gaussian broadening)

Radiative decay

·        State dependent radiative decay (ionic, covalent, metallic)

·        Ratio radiative/ non-radiative decay in (molecules, ionic, covalent, metallic systems)

·        RIXS

·        PFY, IPFY,

Non-dipole transitions

·        NIXS, XRS, EELS

·        1s2p RIXS

·        Dipole-quadrupole mixing

·        Derivation of transition operators

·        X-rays with an orbital moment > predicted consequences

Angles, polarization, spin

·        Azimuthal angular dependent RIXS

·        When do we need 81 matrix elements in (dipole-dipole) RIXS?

·        CD, LD, other dichroisms