X-ray Absorption Fine Structure Spectroscopy (XAFS) is a powerful technique to investigate local atomic geometry and the chemical state of the atoms of one specific element in almost any type of substance. It is particularly well suited to investigate materials that lack long-range order such as:
Samples with very low concentration (min. 500 ppm) can be measured in Fluorescence mode.
IMPORTANT: There is no Gas Rig System at BM14 !!!
The following beam characteristics are taken from BM26A and are not accurate for BM14. The correct values will only be updated after the new source has been installed and the new beamline BM14 has been commissioned. Please check back periodically.
During an EXAFS scan, especially at lower energies (5-9 KeV), the monochromator makes a much larger movement of the Bragg angle (compared to higher energies) which causes a slight vertical displacement of the beam on the sample. A feedback system connected to a beam position monitor is used to keep the beam position fixed on the sample during the EXAFS scan by adjusting the gap between the two crystals of the monochromator.
In these public pages you will find information on
BM14 & BM26 common:
BM14 specific:
Wiki pages: from the intranet pages (intranet.esrf.fr) you have access to the DUBBLE Wiki pages. The Wiki contains much more technical information and details on how to set up and run your experiment on site.
Please, note that the Wiki pages are only available on site.
This is only possible via collaboration with Prof. Laszlo Vincze, University of Ghent, Belgium, please also consult Dipanjan Banerjee prior to proposal.
The beam line is optimised for EXAFS/XANES measurements in transmission and fluorescence mode at the moment.
All chemical elements written with white fonts on coloured background can be studied at the DUBBLE XAFS station (see also the Note under the image). Among them, those already studied are underlined. To get the list of EXAFS/XANES publications corresponding to a given element, click on it in the image.
Note: To measure radioactive elements, you need to come to an agreement with the ESRF Safety group long before you apply for beamtime.
A beamline manual will be available after the commissioning of BM14.
If you want to know more about DUBBLE's XAFS station, please contact Dipanjan Banerjee (Project leader).