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This makes the propargyl self-reaction a pivotal step in the formation of benzene, the first aromatic ring, to eventually lead to polycyclic aromatic hydrocarbons in a variety of environments. In this work, by producing propargyl radicals in a flow tube where propyne reacted with F atoms and probing the reaction products by mass-selected threshold-photoelectron spectroscopy (TPES), we identified eight C<jats:sub>6<\/jats:sub>H<jats:sub>6<\/jats:sub> products in total, including benzene. On top of providing the first comprehensive measurements of the branching ratios of the eight identified C<jats:sub>6<\/jats:sub>H<jats:sub>6<\/jats:sub> isomers in the propargyl self reaction products (4 mbar, 298\u2009K conditions), this study also highlights the advantages and disadvantages of using isomer-selective TPES to identify and quantify reaction products.<\/jats:p>","DOI":"10.1038\/s42004-024-01239-7","type":"journal-article","created":{"date-parts":[[2024,7,12]],"date-time":"2024-07-12T10:01:53Z","timestamp":1720778513000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["The isomer distribution of C6H6 products from the propargyl radical gas-phase recombination investigated by threshold-photoelectron spectroscopy"],"prefix":"10.1038","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9613-5684","authenticated-orcid":false,"given":"Helgi Rafn","family":"Hrodmarsson","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2915-2553","authenticated-orcid":false,"given":"Gustavo A.","family":"Garcia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lyna","family":"Bourehil","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9898-5693","authenticated-orcid":false,"given":"Laurent","family":"Nahon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9658-2436","authenticated-orcid":false,"given":"B\u00e9renger","family":"Gans","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0579-9571","authenticated-orcid":false,"given":"S\u00e9verine","family":"Boy\u00e9-P\u00e9ronne","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2929-057X","authenticated-orcid":false,"given":"Jean-Claude","family":"Guillemin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8063-8685","authenticated-orcid":false,"given":"Jean-Christophe","family":"Loison","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,7,12]]},"reference":[{"key":"1239_CR1","doi-asserted-by":"publisher","first-page":"229","DOI":"10.1016\/0360-1285(81)90001-0","volume":"7","author":"BS Haynes","year":"1981","unstructured":"Haynes, B. 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