2023 APS SMS/CONUSS Workshop May 10-12, 2023 Synchrotron Mössbauer Spectroscopy (SMS) techniques are implemented by a broad scientific community to probe magnetism, valence states, electronic states of a wide range of materials. The brilliance of synchrotron radiation allows probing very small samples, enabling spatially resolved measurements and measurements at extreme conditions of pressures and temperatures. A new SMS technique suitable for 57Fe SMS in the APS-U era in any fill pattern is under development at sector 3. The Advanced Photon Source, Argonne National Laboratory, is organizing an in- person three-day workshop on SMS and CONUSS. The workshop will introduce the new SMS technique to the User community and related beamline capabilities. Extensive hands-on training on spectra interpretation using the software CONUSS (https://www.nrixs.com/conuss.htmlhttps://urldefense.com/v3/__https:/www.nrixs.com/conuss.html__;!!BpyFHLRN4TM...) will be conducted by invited speaker Wolfgang Sturhahn. The workshop is a great opportunity for students and early career scientists to become familiar with CONUSS and discuss specific aspects of SMS data interpretation. The three-day workshop will be conducted at the Advanced Photon Source, Argonne National Laboratory. Please note that Argonne National Laboratory requires a security check for visitors, which may take up to two months, particularly for citizens of countries that are considered sensitive countries under DOE regulations. There is no registration fee to participate to this workshop. Financial support for accommodation will be available for attendees. The workshop will be limited to 20 participants. Webpage: https://www.aps.anl.gov/Sector-3/Conferences-workshops/CONUSS2023https://urldefense.com/v3/__https:/www.aps.anl.gov/Sector-3/Conferences-work... Registration: https://forms.office.com/g/MrJTw0C4XQhttps://urldefense.com/v3/__https:/forms.office.com/g/MrJTw0C4XQ__;!!BpyFHLR... Deadline: registration will close on April 7, 2023 or upon reaching 20 participants.