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The ion source is notable for its compact dimensions of 50\u00a0mm in height and 68\u00a0mm in diameter. The ion source is currently in daily operation at both facilities. Design, simulations, and results of combining ions from thermal and electron-impact ionization of different gases (perfluoropropane and sulfur hexafluoride) are presented in this work. The systematic effects of heating power on the thermal source were studied in detail. The source has demonstrated stable and long-term production of reference ions over a wide mass range for the MR-TOF-MS. This versatile ion source has also been used to optimize and investigate the transport of ions with different chemical reactivity and ionization potentials.<\/jats:p>","DOI":"10.1063\/5.0213443","type":"journal-article","created":{"date-parts":[[2024,8,30]],"date-time":"2024-08-30T12:40:10Z","timestamp":1725021610000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["A compact ion source combining electron-impact and thermal ionization for multiple-reflection time-of-flight mass spectrometry"],"prefix":"10.1063","volume":"95","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2475-001X","authenticated-orcid":false,"given":"Jiajun","family":"Yu","sequence":"first","affiliation":[{"name":"GSI Helmholtzzentrum f\u00fcr Schwerionenforschung 1 , 64291 Darmstadt, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2345-5118","authenticated-orcid":false,"given":"Ali","family":"Mollaebrahimi","sequence":"additional","affiliation":[{"name":"II. 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