Resources

Summary

Equipment or detector	Availability	Comments
Si(111) monochromator and 27 mm period undulator giving energy range 2.05- 20.7 keV (core range 5 -15 keV)	Available	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.	Available	Typically 2-5 (V) x 2 -5 (H) micron spot size. Can be defocused up to 100 μm
Sample stage allows XRF map collection while rastering	Available	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.
4 element 1mm thick senso Vortex Si Drifts detector with cube pre-amps	Available	Xspress 3 electronics give 1000 kHz count rate per element in XAFS mode.
Triax Optical Spectrometer and MCP-PMT for XEOL and OD-XAS	Available	Can be used with Hybrid mode for Time resolved measurements
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.

Sample environments and stages

He enclosure for low energy	Available	At room temperature
In situ Raman	Available	785 nm
Electron yield cell	Available	TEY or CEY operation
He/LN2 Cryostat 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.

Support Labs

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
Fume cupboard	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 (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.

Oxford Instruments MicroRes He/LN2 Cryostat

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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Summary

Sample environments and stages

Support Labs

Oxford Instruments MicroRes He/LN2 Cryostat