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X-ray absorption spectroscopy
Australian Synchrotron beamlines

X-ray absorption spectroscopy

X-ray absorption spectroscopy (XAS) is a versatile tool for chemistry, biology, and materials science. By probing how x rays are absorbed from core electrons of atoms in a sample, the technique can reveal the local structure around selected atoms.

X-ray Absorption Spectroscopy (XAS) is a versatile tool for chemistry, biology, and materials science. By probing how x-rays are absorbed from core electrons of atoms in a sample, the technique can reveal the local structure around selected atoms.

Techniques available

Hutch B:

The first experimental hutch is optimised for transmission and fluorescence XAS on "standard samples" in standard sample holders. This hutch supports the use of transmission ionization chambers, a solid state Ge fluorescence detector, a PIPS detector, soller slits and filters, a fast beam shutter, a 10K cryostat, capillary heating, and a room temperature sample stage. In order to use this experimental hutch, samples/environments must fit inside our cryostat, or inside our room temperature sample stage, or on top of the room temperature stage stack. Some in-situ setups can be accommodated - please contact the beamline team to discuss your specific requirements.

Hutch C:

The second experimental hutch is designed to allow "non-standard samples" in non-standard sample holders / user supplied sample environments. To establish technical feasibility you must contact the beamline team well in advance of proposal submission. The optical table is equipped with three ionization chambers, a solid state Ge fluorescence detector, one set of slits, and motorised stages for user-supplied equipment. Note that there is no harmonic rejection available in this hutch and as such only experiments at the Fe K-edge and above are feasible (> 7 keV).

 

  • Standard samples: e.g. powders, films, or liquids that fit in our standard sample holders.
  • Non-standard samples: e.g. large, fragile, radioactive, or bio-hazards that do not fit in our standard sample holders, and would often be mounted in user-supplied sample environments.

 

Photon delivery system

 Source

1.9T Wiggler
 Available Energy range5 - 31 keV
 Optimal Energy range

Mode 1: 5 - 9 keV using Si(111)

Mode 2: 9 - 19 keV using Si(111)

Mode 3: 15 - 31 keV using Si(311)

 Resolution deltaE/ECrystal dependent:
~ 1.5x10-4 using Si(111)
~ 0.4x10-4 using Si(311)
 Nominal beam size at sample

Approx 0.25 mm2 if fully focussed

 Photon flux at sample 1010 to 1012 ph/s using Si(111)
109 to 1011 ph/s using Si(311)
 Harmonic content at 5-18 keV  < 10-5

 

 

Beamtime