Last reviewed: April 2018
Equipment or detector
Si(111) monochromator and 27 mm period undulator giving energy range 2.05- 20.7 keV (core range 5 -15 keV)
Can be used from 7 -20 keV in Si(333) mode with less flux but higher resolution
Mechanical KB mirrors with Si and Rh stripes. Mirrors can be moved from beam path for bulk EXAFS.
Typically 2-5 (V) x 2 -5 (H) micron spot size.Can be defocused up to 100 μm
Sample stage (25 mm X movement, 30 mm Y movement, 4 kg load) allows XRF map collection while rastering
XRF maps using continuous scanning of the x-stage removes the deadtime associated with step scans allowing for larger and faster XRF maps. A 200 x 200 point map may now be done in about 2 hrs if the sample is concentrated enough.
|Large sample stage with 100 mm x 30 mm movement||Available||Allows somewhat larger samples/areas to be scanned especially concentrated samples with a dwell time per point as low as 0.01 s|
4000 x 2000 pixel CMOS based X-ray imaging detector
Normal angular range ca 12-45 degrees two-theta. Can be used further away to get to ca. 5.5 degrees two theta . Also micro-XRD-CT available
4 element Standard Vortex Si Drifts detector (2 -15 keV)
Xspress 3 electronics give 500 kHz count rate per element in XAFS mode, up to 1.25 MHz in XRF mode
(Both Si detectors can be used simultaneously)
4 element 1mm thick senso Vortex Si Drifts detector with cube pre-amps
|Xspress 3 electronics give 1000 kHz count rate per element in XAFS mode, up to 1.5 MHz in XRF mode|
Triax Optical Spectrometer and MCP-PMT for XEOL and OD-XAS
|Can be used with Hybrid mode for Time resolved measurements|
|Available||Reconstruction algorithm in development but exists in beta form.|
|Fluoresence ReflEXAFS||Available|| |
The Si detectors are mounted vertically and a Theta tilt stage goes on normal sample stage to align samples.
Reflexafs is done with an unfocused vertical beam.
|Capillary in front of Fluorescence detector for 3d XAS/XRF||Available||A focussing optic on the detector is used to define a narrow sampling volume from the incident x-rays and outgoing fluorescence signal. This confocal arrangement enables slice, volume and depth dependant XRF/XANES studies of thick samples and solid particles. Spatial resolution in the beam direction ranges from 10-15microns depending on energy.|
We ahope to develop a new fixed bend mirror system as an alternative to our current system to give a smaller (sub-micron) focus.
|Linkam TMS stage: 25 – 600 C||Available||Sample in gas environment|
|Linkam 1500 furnace 25 -1400 C||Available||Sample in gas environment|
|He enclosure for low energy||Available||At room temperature|
|In situ Raman||Available ||785 nm|
|Electron yield cell||Available||TEY or CEY operation|
|Oxford Instruments MicroStat HIRes||Available|| |
Vacuum cryostat. The cooling systems have been upgraded. Sample cooling to 4K is now possible with excellent positional stability.
|LN2 Cryostreams for VT down to 10K||Available|| |
About 3 mm of sample remains ice free for XRF. Not suitable for XAS
Can be used for Tomography on capillaries firing the jet along the axis of the capillary.
|Three labs: wet, dry and characterisation||Available||With basic equipment such as hot plate, balances, selection of glassware, pestle and mortar, tweezers, spatulas etc.|
|Thermo FT-IR Microscope||Available||FT-IR with mapping capabilites|
|Yves Jobin Micro XRF||Available||50keV - 100μm spot size|
|Perkin Elmer UV spectrometer||Available|
|Wet O2 free and H2O/O2 free Ar glove boxes||Available||Please indicate a glove box is required in the proposal|
|Renishaw Raman Microscope||Available||Micro-raman system with mapping capabilities. Red and blue lasers.|
|Zeiss AxioVision Optical Microscope||Available|
|Nikon Polarised Microscope||Available|
|Microbiological safety cabinet (class 2)||Available|
|Grinding/Polishing machine||Available||Range of polishing grades available|
|Cutting machine||Available||Water cooled|
|Cryo Microtome||Available||A cryotome is avaialble in lab 92, some trainign is available.|
|Pellet Press||Available ||8 and 13mm dies|
|Tube Furnaces||Available on request ||Advance notice required.|
|Upright Furnace in Air||Available ||Up to 1500C|
|Clean Room||Available||Balance and Microscope installed|
|Fridge/ Freezer (-20 C)||Available||Access to a -80 freezer available on request|
|Low level Radiochemistry Lab With Glove Bag, mini centrifuge||Available ||Please contact Fred Mosselmans for more info.|
Timing information: A typical EXAFS scan takes 20 minutes or so with a 3 micron or so sized beam. Mapping at higher energies (using Ge or Si detector) can now be done at around 10 points per second using rastering or even faster for concentrated samples, 1 pt per second in step by step mode. For low PPM (single figure) samples more time per point is required , typically 1-2 seconds.
This low-vibration cryostat can be used either with liquid helium or liquid nitrogen. The sample chamber is in vacuum. We recommend mounting of thin sections on sapphire discs which, once on the beamline, can be mounted on clip-on aluminium discs. There are several restrictions in the diameter of the sections that can be mounted (apprx 15 mm) and in the area that is available for x-ray imaging due to the finger that holds the aluminium disc in place. Please get in touch with the beamline for more information.
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Harwell Science & Innovation Campus