Selected presentation abstracts, with an informal introduction from the speakers.
Cryo scanning soft x-ray microscope optimized for spectro-tomography
Canadian Light Source, Spectromicroscopy beamline (10ID-1)
In the summer of 2013, I moved from Hamburg to Saskatoon to lead the technical design of a new soft x-ray STXM optimized for spectro-tomography at CLS. Three years later, I have this great opportunity to travel to XRM2016 to tell you all about the finished product. The CLS cryo-STXM borrows many design concepts from previous STXMs and adds our own new, liquid nitrogen cooled spins. I hope you'll enjoy the talk, and don't forget, XRM2018 will be in Saskatoon!
Photograph through a viewport of the CLS cryo-STXM vacuum chamber, highlighting the components on the optical axis in "conventional mode" (from left to right): Zone plate holder (bronze), order sorting aperture, sample, and scintillator-photomultiplier tube detector. The lines on the zone plate holder and detector are 1 mm spacing.
Prof. Chris Jacobsen visits CLS during the design phase, and demonstrates the operation of key cryo equipment he generously donated to our project. From left to right: Stephen Urquhart (just his leg), Chris Jacobsen, John Swirsky, Chris Regier, Russ Berg, Denis Beauregard, Kyle Epp, Darwin Taylor.
Abstract
CRYO SCANNING SOFT X-RAY MICROSCOPE OPTIMIZED FOR SPECTRO-TOMOGRAPHY
A.F.G. Leontowich1, R. Berg1, C. Regier1, D.M. Taylor1, J. Wang1, J. Swirsky1, C. Karunakaran1, A.P. Hitchcock2, S.G. Urquhart3
1. Canadian Light Source Inc., 44 Innovation Boulevard, Saskatoon, SK, Canada
2. Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON, Canada
3. Department of Chemistry, University of Saskatchewan, Saskatoon, SK, Canada
A new scanning soft X-ray microscope, the cryo-STXM, has been commissioned at the Canadian Light Source SM beamline. This microscope is optimized for soft X-ray spectro-tomography from 100 – 4000 eV. Users can load a liquid nitrogen cooled sample, through a load lock, and rotate it ±70° in the beam to collect tomographic data sets. The sample remains at -170°C to suppress some aspects of radiation damage, and a pressure of 10-8 Torr to suppress contamination formation on the cold sample. The microscope is controlled via an all new python-based software package, pySTXM. Spatial resolution (30 nm), spectral resolution (0.1 eV), and data acquisition rates are comparable to other modern scanning soft X-ray microscopes. Recent results and design details of the cryo-STXM will be presented, including large area (100 μm × 100 μm) zone plate scanning, coordinated zone plate and order sorting aperture scanning, and how to interface a transmission electron microscope goniometer with a synchrotron-based scanning X-ray microscope.
The CLS cryo-STXM is a component of a CFI Leading Edge fund project, "Enhancing the Spectro-microscopy Beamline and Endstations at the Canadian Light Source” (U. Sask; S.G. Urquhart, Project Leader), with partial financial support from AFCC Automotive Fuel Cell Cooperation Corp. CLS is supported by the Canada Foundation for Innovation, Natural Sciences and Engineering Research Council of Canada, the University of Saskatchewan, the Government of Saskatchewan, Western Economic Diversification Canada, the National Research Council Canada, and the Canadian Institutes of Health Research.
Figure 1: Photograph inside the CLS cryo-STXM vacuum chamber highlighting the components on the optical axis (from right to left): Vacuum window, zone plate, order sorting aperture, cryo-tomo sample, scintillator-photomultiplier tube detector.
Adam Leontowich
When I'm not working at the Canadian Light Source, I'm currently enjoying the harvest from my garden, and trying to put a winter curling team together.
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