Hello Colin, I have little familiarity with XES (or xraylarch, for that matter) so apologies if this isn't useful for your use-case - I'm sure some others will chime in with their respective tools, but I wanted to give a plug for the tool h5analysis (https://urldefense.us/v3/__https://h5analysis.readthedocs.io/latest/index.ht... ), which is maintained and developed by Teak Boyko and Patrick Braun at the REIXS beamline for this purpose, and which has some basic Larch integration features. Daniel Correia (he/him) Support Scientist, VLS-PGM Beamline | 306-657-3775 Canadian Light Source | A research facility of the University of Saskatchewan 44 Innovation Boulevard, Saskatoon Saskatchewan, Canada S7N 2V3 ________________________________ From: Morrell, Colin T. via Ifeffit Sent: Friday, June 13, 2025 2:10 PM To: ifeffit@millenia.cars.aps.anl.gov Cc: Morrell, Colin T. Subject: External: [Ifeffit] Larch for XES processing Hello, I am new to the technique of XES and have been working out a way to analyze some XES spectra. I have used Larch in the past for XAS analysis and found a few places that indicated that larch is also capable of processing XES data in the ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd Hello, I am new to the technique of XES and have been working out a way to analyze some XES spectra. I have used Larch in the past for XAS analysis and found a few places that indicated that larch is also capable of processing XES data in the LarchGUI application. I have been working to install a version or find how to do this and have not been successful. Have XES support been removed from the larch applications? Any help or clarification is greatly appreciated! Thank you in advance. Sincerely, Colin Morrell PhD Candidate | See Group Division of Chemistry & Chemical Engineering California Institute of Technology

Hi Colin, We just released XES Neo this week. Here is a link to the article describing it. https://urldefense.us/v3/__https://pubs.aip.org/avs/jva/article/43/4/043411/... This might assist you in your analysis. Jeff Jeff Terry Vice Provost for Research Professor of Physics Professor of Mechanical, Materials, and Aerospace Engineering Editor, Applied Surface Science Illinois Institute of Technology 10 W. 35th Street, Suite 10F9 Chicago IL 60616 312-567-3021 <- ****Note New Phone**** terryj@iit.edu ________________________________ From: Morrell, Colin T. via Ifeffit Sent: Friday, June 13, 2025 3:10:09 PM To: ifeffit@millenia.cars.aps.anl.gov Cc: Morrell, Colin T. Subject: [Ext][Ifeffit] Larch for XES processing Hello, I am new to the technique of XES and have been working out a way to analyze some XES spectra. I have used Larch in the past for XAS analysis and found a few places that indicated that larch is also capable of processing XES data in the ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd Hello, I am new to the technique of XES and have been working out a way to analyze some XES spectra. I have used Larch in the past for XAS analysis and found a few places that indicated that larch is also capable of processing XES data in the LarchGUI application. I have been working to install a version or find how to do this and have not been successful. Have XES support been removed from the larch applications? Any help or clarification is greatly appreciated! Thank you in advance. Sincerely, Colin Morrell PhD Candidate | See Group Division of Chemistry & Chemical Engineering California Institute of Technology