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(2020) Spectroscopy Capabilities at the Australian Synchrotron, ANSTO

Hamilton J & Kappen P


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Submitted by Laura Otter on Monday 22nd June 09:29
Hi Jessica, this was a great presentation - I really enjoyed this overview of the different methods available at the AS! I'd like to know what the minimum spatial resolutions of your different FTIR and Terahertz IR mapping capabilities are? Thanks again! Cheers Laura Otter
Hi Laura, thanks for your question! While the Terahertz beamline is spectroscopy only and does not offer mapping, the Infrared Microscopy beamline is optimised for mapping. The spatial resolution here depends on the set up. For standard transmission and reflectance setups in which the beam passes through the sample through the air, the resolution is 4-8 um, about the size of a single cell. For ATR setup in which the beam is passed through a germanium (Ge) crystal that is in contact with the sample, the resolution is enhanced by a factor of 4, bringing the resolution down to 1-2 um. In terms of spectral range of the IRM beamline, it depends on the detector used. These are approximately: Narrow-band MCT detector (this is our standard detector): 3800 - 900 cm-1 Wide-band MCT detector: 3800 - 700 cm-1 Far-IR bolometer (borrowed from THz beamline to do mapping on IRM): 650 - 350 cm-1 You can find technical information about the IRM beamline here: https://www.ansto.gov.au/user-access/instruments/australian-synchrotron-beamlines/infrared-microspectroscopy/technical Cheers, Jess

Submitted by Anthony Lanati on Tuesday 23rd June 02:10
Hi Dr. Hamilton, Really interesting talk, I hadn't realised AS was getting a mid-range XAS beamline. Very exciting for those of us that study S, and K for example. Once the beamline is operational will it be possible to combine it with the traditional XAS for Fe within the same experimental program (i.e. on the same proposal)? Also, I assume thin sections are fine but how well could the AS accommodate an experimental charge, say from a piston cylinder or multi-anvil? Assuming standard capsule materials (Au, Ag, Pd, Ni, Pt or other aloy combo), would it also be possible to image a closed run product for the lighter elements, then move up to the heavier elements before cutting and sectioning for classical analyses? I ask as there are a number of questions around melt quench ┬▒ vapour phases that could be answered with the right workflow. Thanks again for the talk!
Hi Anthony, thanks for your question! Yes, the MEX beamline will also access first row transition metals, allowing both S and Fe analysis. At the moment, separate proposals are required to access different beamlines, but there are plans in the pipeline to streamline the process and make it easier to apply for time on multiple beamlines - so watch this space! As far as set up changes, at XAS we have a dedicated hutch for big user set ups, so can accommodate most things. In these cases, it just takes extra time (perhaps a shift) if you need to change experimental set ups within a beamtime. I'm not 100% sure what set-ups MEX will be able to accommodate, but I would recommend getting in touch with Jeremy Wykes to find out more about that. Regarding the cylinders, these will have to have some kind of window to see into the sample chamber, as X-rays will be absorbed by Au, Ag, Pt, etc type materials. Jeremy is definitely the right person to talk to about this, he has a lot of experience in experimental petrology :)

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