Speaker
Danielle Martin
(Australian Synchrotron)
Description
The IR Microscopy (IRM) beamline at the Australian Synchrotron is used to generate detailed FTIR chemical maps of samples at diffraction-limited spatial resolutions, with high S/N ratios. Using a single element detector and confocal-like apertures to focus the beam at the sample surface, 2D maps at spatial resolutions between 3-5 microns can be measured. This is however time-consuming, with one 50 micron squared map taking 1-2 hours to acquire. How then can sample throughput be improved? FTIR mapping systems using Focal Plane Array (FPA) detectors are capable of covering much greater surface areas at a time; each array pixel can measure a full FTIR spectrum, and the IRM beamline at the Australian Synchrotron is equipped with a 64x64 FPA. The compromise is that a Globar source must be used to evenly illuminate this relatively large detector, greatly reducing spatial resolution. So how then to illuminate a large array with a small, low-emittance SR beam? The IRENI beamline, SRC, extracted 12 IR beams from their source to achieve full FPA illumination across a 96x96 array (1). We extract only one IR beam, therefore such wide field illumination is not possible. Instead this poster outlines a method similar to that used at NSLS (2), where the single beam is split into 4, to successfully illuminate a 16x16 FPA grid. The overall setup and some results are shown.
(1) Nasse et al. Nature methods 8.5 (2011)
(2) Stavitski et al. Analytical chemistry 85.7 (2013)
| Keywords | Infrared, microscopy, chemical maps, focal plane array |
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Primary author
Danielle Martin
(Australian Synchrotron)
Co-authors
Dr
Jitraporn (Pimm) Vongsvivut
(Australian Synchrotron)
Dr
Keith Bambery
(Australian Synchrotron)
Dr
Mark Tobin
(Australian Synchrotron)
