BM23 - XAS Beamline

Synopsis

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

Disciplines

• Physics
• Chemistry
• Materials and Engineering
• Environmental Sciences
• Earth and Planetary Sciences

Applications

• Chemistry
• Catalysis
• Solid state physics
• Materials science
• Biophysics
• Environmental science
• Earth and planetary science
• Cultural heritage

Techniques

• EXAFS - extended X-ray absorption fine structure
• FTIR - Fourier transform infrared spectroscopy/microscopy
• MicroXANES - micro X-ray absorption near-edge structure
• XAFS - X-ray absorption fine structure
• XANES - X-ray absorption near-edge structure
• XRD - X-ray diffraction
• XRF - X-ray fluorescence

Sample environments

• Gas delivery system and remotely controlled gas mixing setup for reactive gases
• Chemical reactors and furnaces for in situ studies under controlled temperature, pressure and gas feed (for pellets and powdered samples)
• Mass-spectrometer for gas composition analysis
• XAS/DRIFTS setup to measure XAS and DRIFTS spectra simultaneously
• UV-Vis spectrometer with fiber optics for transmission measurements
• Multi-sample holder (16 pellets of 5 mm diameter) under controlled atmosphere
• Liquid He cryostat (4-300K) - pellets
• Online microscope setup in backscattering geometry for microXRF measurements on large samples
• Diamond Anvil Cells (up to 150 GPa combinable with cryo-cooling (5K) or resistive heating (1500 K)) combinable with a PRL, XRD, XRF
• Paris Edinburgh large volume press (17 GPa, 2000K) combinable with XRD and XRF

Detectors

• Ionization chambers
• XRF detectors: Hitachi Vortex Si drift detectors ( 1 mm and 2 mm chip thickness for low and high energy detection) coupled to FalconX electronics (offering a high saturation level at 1 million counts) and combinable with a polycapillary for microXRF measurements in the DAC
• XRD detector: Pilatus 1M (angle-resolved XRD detector for specific applications)
• Mass spectrometer: Pfeiffer OmniStar GSD 350
• FTIR spectrometer: Agilent Cary 680 with DRIFTS setup for combined DRIFTS/XAS measurements
• Online microscope for sample position visualization 
• A PRL system  for online pressure determination in the DAC

Reference publication

O. Mathon et al., A. Beteva, J. Borrel, D. Bugnazet, S. Gatla, R. Hino, I. Kantor, T. Mairs, M. Munoz, S. Pasternak, F. Perrin, S. Pascarelli, J. Synchrot. Radiat. 2015, 22, 1548.