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.
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.
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
|Available Energy range||5 - 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/E||Crystal 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|