BM23 is a bending magnet beamline optimized for standard EXAFS in a large energy range (5-75 keV), oriented towards high-quality data collection, stability and versatility, high automation, online data analysis and flexible sample environments

BM23 is the general purpose X-ray absorption spectroscopy beamline at the ESRF. It aims to meet the needs of the member countries in the area of conventional X-ray absorption spectroscopy. Principally, BM23 is designed to perform experiments which have requirements that fall beyond the capabilities of most second generation synchrotron sources, but which do not require the specialist characteristics of the other ESRF X-ray absorption instruments. The strengths to which BM23 operates arise from the intrinsic properties of the ESRF synchrotron, coupled with a bending magnet source and the high quality performance of the beamline's principle optical element, its monochromator.

The beamline is primarily used to investigate the electronic and local structure in crystalline, amorphous and liquid matter in a variety of thermodynamical and reaction conditions. It now features a micro-XAS facility that offers a spot size of 5 x 5 um2

Research at BM23 covers a variety of scientific domains, including solid state physics, materials science, geosciences, environmental science, solution chemistry, heterogeneous and homogeneous catalysis.

Beamline Energy Range
5000 - 75000 [eV]
Photon Sources

0.8T Bending Magnet

Type
Bending Magnet
Available Polarization
Linear horizontal
Monochromators

Double Crystal Fixed Exit

Energy Range
5000 - 75000 [eV]
Type
Si(111), Si(311), Si(511)
Other Optics

Micro XAS facility

Description
two mirrors in KB configurations
Pt coating
variable grazing incidence

Pair of Harmonic Rejection Mirrors

Description
Si, Rh, Pt coatings
variable grazing incidence angle (2-5 mrads)
First mirror Flat
Second mirror Bent (variable radius)
Detectors

13 element Ge

Passive or Active (Electronics)
Active

Detection

Detected Particle
Electron

Ion Chambers

Passive or Active (Electronics)
Active

Detection

Detected Particle
Electron

Si Vortex

Passive or Active (Electronics)
Active

Detection

Detected Particle
Electron
contacts
Sakura PASCARELLI
Olivier MATHON
Techniques
Absorption
  • EXAFS
  • NEXAFS
Emission or Reflection
  • X-ray fluorescence (XRF)
control/Data analysis
Control Software Type
  • The control of the experiments is through a Graphical User Interface (Python) and SPEC
Data Output Type
  • ascii
Data Output Format
  • multiple columns in ascii format, with metadata header
Softwares For Data Analysis
  • on line data analysis and visualization with fortran-based software invoked by the GUI, running locally
in partnership with