FAME-UHD, the French Absorption spectroscopy beamline in Material and Environmental sciences at Ultra-High Dilution, is dedicated to high energy resolution fluorescence detected x-ray absorption spectroscopy (HERFD-XAS) for structural investigation of ultra-diluted samples. The key element of the beamline is thus a crystal analyser spectrometer, which enables XANES analyses at concentrations as low as 1ppm and EXAFS at 10ppm.

 

This low detection limit is obtained thanks to the combination of state-of-the-art cooled optics (designed firstly to maximize the photon flux on the sample and secondly to optimize the beamline stability and reduce the non-statistical noise) and multi-crystal analyser spectrometer.

 

This is of particular interest for environmental and biological systems: study of trace elements in soils, effect of pollutants at low concentrations...

 

Opened to users since January 2017, the beamline is designed to accept easily different sample environments: the beamline helium cryostat but also, HP-HT vessel, electrochemical cells, cells for gaseous reactions...

 

FAME-UHD is one of the French CRG beamlines at the ESRF: beamtime can be asked both through the ESRF and the Soleil program committees.

Beamline Energy Resolution
6 * 10-1 [eV] @ 12 [eV]
Beamline Energy Range
4800 - 20000 [eV]
Spot Size On Sample Hor
150 - 250 [um]
Spot Size On Sample Vert
80 - 150 [um]
Photon Sources

0.8T ESRF BM

Type
Bending Magnet
Available Polarization
Linear horizontal
Monochromators

FAME-UHD monochromator

Energy Range
4900 - 25000 [eV]
Type
Si[220] 2-crystals, liquid nitrogen cooled, sagittal bending (horizontal focussing).
Pre-focusing Mirror Type
Mirror for vertical collimation and harmonic rejection: Rh-coated, variable incidence angle (2.5 to 7mrad) and variable curvature.
Refocusing Mirror Type
Mirror for vertical focussing and harmonic rejection: Rh-coated, variable incidence angle (2.5 to 7mrad) and variable curvature.
Endstations or Setup

Spectrometer

Spectrometer
Crystal Analyser Spectrometer
Base Pressure
1 * 103 [mbar]
Detectors Available
Transmission mode
Crystal Analyser Spectrometer
Endstation Operative
Yes

Sample

Sample Type
Crystal, Amorphous, Powder, Liquid

Manipulator or Sample stage

Translator Stages
5
Positioning Precision
X = 1 [um], Y = 1 [um], Z = 1 [um]
Range Of Movement
X = 5 [mm], Y = 20 [mm], Z = 40 [mm]

Sample Environment

Temperature
4 - 300 [K]
Pressure (min)
1 [bar]
Pressure (Max)
2000 [bar]
Temperature
293 - 1500 [K]
Detectors

Crystal Analyser Spectrometer

Type
Crystal Analyser Spectrometer
Description
14 bent crystals (1m) + Vortex SDD detector located on the Rowland Circle
Passive or Active (Electronics)
Active

Detection

Detected Particle
Photon

Transmission mode

Type
Diodes
Description
Si diodes collecting photons scattered by air in a black chamber for both incident and transmited intensity measurements
Passive or Active (Electronics)
Active

Detection

Detected Particle
Photon
contacts
Denis TESTEMALE
Isabelle KIEFFER
Jean-Louis HAZEMANN
Olivier PROUX
Mauro ROVEZZI
Techniques
Absorption
  • EXAFS
  • NEXAFS
Emission or Reflection
  • X-ray fluorescence (XRF)
Disciplines
Chemistry
  • Biochemistry
  • Catalysis
  • Electrochemistry
  • Green Chemistry
  • Physical Chemistry
Earth Sciences & Environment
  • Geology
  • Mineralogy
  • Natural disaster, Desertification & Pollution
  • Plant science
  • Water sciences/Hydrology
Energy
  • Sustainable energy systems
Humanities
  • Cultural Heritage
Life Sciences & Biotech
  • Molecular and cellular biology
Material Sciences
  • Other - Material Sciences
Physics
  • Hard condensed matter - structures
control/Data analysis
Control Software Type
  • SPEC
Data Output Type
  • spectra (X: Energy, Y: absorption in fluorescence, transmission, temperature of measurement...)
Data Output Format
  • TXT
Softwares For Data Analysis
  • Athena (XAS normalizaton), Artemis (EXAFS analysis), FDMNES (XANES analysis)
Equipment That Can Be Brought By The User
Windows and volume should be adapter to the spectrometer. Contact the beamline staff to discuss.
in partnership with