ID26 - X-Ray Absorption and Emission Spectroscopy (XAS-XES)

Contact Tel: +33(0)47688 +ext Pieter Glatzel, Scientist in charge 2968 Kristina Kvashnina, Scientist 2898 Control Room: 2774 Mail ID26:

Synopsis

ID26 is dedicated to X-ray spectroscopy in the applied sciences. The high-brilliance X-ray beam allows for absorption studies on very dilute samples. X-ray emission spectroscopy is performed by means of a crystal spectrometer. By combining the tuneable incident energy with an emission spectrometer we take advantage of resonance effects that can provide detailed information on the electronic structure. ID26 is equipped for different sample environments to perform in situ studies and we can also adapt to a variety of user experimental stations.

• Incident energy range from 2.4 to 27 keV.
• Quick monochromator scans (’on-the-fly’ date collection) for radiation sensitive samples and time evolution studies.
• Emission spectrometer using five analyzer crystal with scattering angle between 0 and 180 degrees.

Scientific Applications

The local coordination and electronic structure of an X-ray absorbing atom are studied by extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) spectroscopy. X-ray emission (XES) and resonant inelastic X-ray scattering (RIXS) spectroscopy are sensitive to electron-electron interactions and give information that is complementary to absorption spectroscopy. We can thus study orbital splittings, spin- and oxidation states as well as the local symmetry and coordination. RIXS gives access to element-specific excitations of only a few eV that can arise from local (e.g. d-d), nearest neighbor (e.g. charge transfer) and collective (e.g. plasmon) excitations.

With the hard X-ray probe, very few restrictions apply to the possible sample environments. Our main experimental interests are therefore in situ studies in applied fields. We have ongoing projects in mineralogy/geology, catalysis, materials science, magnetism and cultural heritage.

For some examples and an introduction to XAS/XES please visit http://www.pieter-glatzel.de.

Complementary Information

• Source Characteristics

Tips for Users

ID26 welcomes users from all fields of natural sciences.

You find the deadlines for proposal submission on the ESRF web page with all necessary information. Please state clearly on the form what absorption edge/emission line you would like to measure and the concentration of the element(s) you are interested in. It is very important to give as much information as possible on the sample and the conditions: matrix, solvents, thickness, substrate composition, in-situ environment, ... since all these factors influence the measurements.

Please do not hesitate to contact us before the submission deadline in case you have questions. In case your proposal is accepted you will receive notice from the user office and shortly after the scheduled dates from the beamline responsible. A beam line staff member will be assigned to you as your local contact.

Your local contact will give advice and prepare the beamline in order to be ready for your experiment. Please consider including your local contact and other ESRF staff as collaborators in case you require an elaborate experimental setup and/or you don't think that you can run the experiment by yourself.

Please view the general ESRF guidelines for users:

The beamline features a Saeco coffee machine with grinder and users are invited to bring their favorite blend.

A number of matlab files were written by us to help the users with the data analysis. They can be downloaded here: ID26 Matlab folder

Unzip the folder and define the paths (set subfolders). The commands are:

specconv

esrf2cont

disas

mot2ascii

disprixs