May 2025 - Ifeffit - millenia.cars.aps.anl.gov

Question about Air sensitive sample holder
by Helen Chen 05 Jun '25

05 Jun '25

Hello, Our group (Jerry Seidler) just started a project involving doing VTC and HERFD on Yb doped CrX3 material. They are thin small crystal sheets and are very air sensitive. We have tried encapsulated them between a layer of laptop tape and film, but after 12hr we see degradation due to air leaks. I am looking for some advice on air sensitive sample holder. What are some typical methods you use to deal with air sensitivity, especially for samples in thin sheets geometry? Thank you

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Influit Energy - Materials Scientist - X-ray Characterization Specialist
by Carlo Segre 03 Jun '25

03 Jun '25

Influit Energy is a dynamic and rapidly expanding company, developing energy storage solutions through cutting-edge research in battery technology, nanomaterials, and materials science. Please see the job posting at Influit Eneergy - Materials Scientist Position <https://urldefense.us/v3/__https://jobs.gusto.com/postings/influit-energy-i… > -- Carlo U. Segre, CTO Influit Energy, LLC 2312 W. Warren Blvd. Chicago, IL 60612

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Larch 2025.2.0
by Matt Newville 27 May '25

27 May '25

Hi Folks, Larch 2025.2.0 has been released, with many fixes and improvements in the past few months, especially for the Larix GUI application. When running Larix, you should be prompted to run the "Update Larch" program. Some of the changes for this release include: - The Plotting section for the XAS Normalization panel has changed to give fewer "main plotting options", but then additional options for pre-edge lines, derivatives, etc. - The Plotting section for the EXAFS panel has also changed. Here, the choices for what to plot are now organized by "Space": Energy, k (including filtered or q), and R. Because there are many choices for making 2 plots at a time, the options can be saved and recalled later (including in later sessions). - There are several improvements for reading and showing non-XAS or "XY data". - There is an initial working version of a generic Curve Fitting Panel for XY and XAS data. This is similar to the Pre-edge Peak Fitting Panel, but it does not require the removal of a baseline first. - There is now an "XAS Mode" selection when importing data from plain Column Files. Currently, the choices are "Unknown", "Transmission", "Fluorescence", "HERFD", and "Calculation". The intent is to allow adjusting normalization and analysis parameters based on this Mode. Currently, only "Calculation" actually adjusts the normalization parameters. - Reading in XAS calculations from Feff (xmu.dat) or FDMNES with "Mode=Calculation" gives better pre-edge (using only the first point) and normalization. There are many more bug fixes and improvements detailed at See https://urldefense.us/v3/__https://github.com/xraypy/xraylarch/releases/tag… . There are plenty of people to thank for these fixes, but special thanks again goes to Mauro Rovezzi and Shelly Kelly. --Matt PS: We have missed a few recent Developers+Interested Users meetings. I think we should get back to having these, but maybe at a different pace. If anybody would like to discuss development or features in more detail, let me know.

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