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The system integrates a high-resolution hemispherical electron analyzer with a Wiley\u2013McLaren-type ion time-of-flight (TOF) spectrometer, enabling coincidence measurements of Auger electrons and high-energy photoelectrons. Designed to overcome challenges in high-energy electron detection while maintaining excellent energy resolution, the setup covers a broad kinetic energy range up to 5\u2005keV, allowing investigation of hard-X-ray-induced Auger cascades in molecules containing high-\n                    <jats:italic>Z<\/jats:italic>\n                    elements, where initial fluorescence decay is followed by Auger processes within this 5\u2005keV detection window. The ion TOF spectrometer provides high-resolution ion mass and momentum analysis, essential for studying light and fast ions generated by deep-core ionization. System capabilities are demonstrated through test measurements on benchmark atomic and molecular systems, such as argon, nitrogen and carbon disulfide. These measurements demonstrate energy-resolved high-kinetic-energy photoelectron\u2013ion coincidences and momentum-resolved multi-ion coincidences following deep-core ionization and Coulomb explosion. MUSTACHE enables investigations into deep-core ionization, Auger cascade processes and Coulomb explosion dynamics in isolated gas-phase species, offering insights into fundamental ionization and fragmentation processes. These results demonstrate that the MUSTACHE setup is a\u00a0powerful tool for high-resolution electron\u2013ion coincidence spectroscopy, extending advanced coincidence techniques into the hard X-ray regime and providing unprecedented opportunities for studying high-energy X-ray-induced phenomena.\n                  <\/jats:p>","DOI":"10.1107\/s1600577525004862","type":"journal-article","created":{"date-parts":[[2025,6,13]],"date-time":"2025-06-13T07:54:08Z","timestamp":1749801248000},"page":"1017-1027","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":2,"title":["High-resolution electron\u2013multi-ion coincidence set-up for gas-phase experiments in the tender and hard X-ray range"],"prefix":"10.1107","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5275-5913","authenticated-orcid":true,"given":"Edwin","family":"Kukk","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05vghhr25","id-type":"ROR","asserted-by":"publisher"}],"department":["Department of Physics and Astronomy"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Regis","family":"Vacheresse","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02en5vm52","id-type":"ROR","asserted-by":"publisher"}],"department":["CNRS, Laboratoire de Chimie Physique-Mati\u00e8re et Rayonnement"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2007-6419","authenticated-orcid":true,"given":"Iyas","family":"Ismail","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02en5vm52","id-type":"ROR","asserted-by":"publisher"}],"department":["CNRS, Laboratoire de Chimie Physique-Mati\u00e8re et Rayonnement"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9015-3339","authenticated-orcid":true,"given":"Tatiana","family":"Marchenko","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02en5vm52","id-type":"ROR","asserted-by":"publisher"}],"department":["CNRS, Laboratoire de Chimie Physique-Mati\u00e8re et Rayonnement"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9239-7372","authenticated-orcid":true,"given":"Renaud","family":"Guillemin","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02en5vm52","id-type":"ROR","asserted-by":"publisher"}],"department":["CNRS, Laboratoire de Chimie Physique-Mati\u00e8re et Rayonnement"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3303-7494","authenticated-orcid":true,"given":"Maria Novella","family":"Piancastelli","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02en5vm52","id-type":"ROR","asserted-by":"publisher"}],"department":["CNRS, Laboratoire de Chimie Physique-Mati\u00e8re et Rayonnement"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2525-5435","authenticated-orcid":true,"given":"Marc","family":"Simon","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02en5vm52","id-type":"ROR","asserted-by":"publisher"}],"department":["CNRS, Laboratoire de Chimie Physique-Mati\u00e8re et Rayonnement"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9504-3692","authenticated-orcid":true,"given":"Oksana","family":"Travnikova","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02en5vm52","id-type":"ROR","asserted-by":"publisher"}],"department":["CNRS, Laboratoire de Chimie Physique-Mati\u00e8re et Rayonnement"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2025,6,23]]},"reference":[{"key":"ok5140_bb1","doi-asserted-by":"crossref","first-page":"222","DOI":"10.1016\/j.elspec.2015.06.004","volume":"200","author":"Arion","year":"2015","journal-title":"J. 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