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The dominant channel for the first pair of isomers is found to be hydrogen cyanide (HCN) neutral loss, while the second pair of isomers lose HCNH neutral as its dominant channel. Despite this difference in their primary decay products and the differences in the structures of the four targets, various similarities in their experimental signatures are found, which could be explained by isomerization mechanisms to common structures. The fundamental role of these isomerization in controlling different dissociative channels is explored via a detailed analysis of the experimental photoelectron\u2013photoion coincidences and the investigation of the theoretical potential energy surface. These results add to the notion of a universal PANH fragmentation mechanism and suggests the seven member isomerization as a key candidate for this universal mechanism. The balance between isomerization, dissociation, and other key mechanistic processes in the reaction pathways, such as hydrogen migrations, is also highlighted for the four molecules.<\/jats:p>","DOI":"10.1063\/5.0158189","type":"journal-article","created":{"date-parts":[[2023,9,13]],"date-time":"2023-09-13T10:31:57Z","timestamp":1694601117000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":9,"title":["In search of universalities in the dissociative photoionization of PANHs via isomerizations"],"prefix":"10.1063","volume":"159","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9489-4580","authenticated-orcid":false,"given":"Arun","family":"S","sequence":"first","affiliation":[{"name":"Indian Institute of Space Science and Technology 1 , Thiruvananthapuram 695547, Kerala, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1583-9103","authenticated-orcid":false,"given":"Karthick","family":"Ramanathan","sequence":"additional","affiliation":[{"name":"Indian Institute of Space Science and Technology 1 , Thiruvananthapuram 695547, Kerala, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-4726-2058","authenticated-orcid":false,"given":"Muthuamirthambal","family":"Selvaraj","sequence":"additional","affiliation":[{"name":"Indian Institute of Space Science and Technology 1 , Thiruvananthapuram 695547, Kerala, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4976-2033","authenticated-orcid":false,"given":"Marco","family":"Cautero","sequence":"additional","affiliation":[{"name":"Elettra-Sincrotrone Trieste 2 , Strada Statale 14 - km 163, 5 in AREA Science Park, Basovizza, TS 34149, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8585-626X","authenticated-orcid":false,"given":"Robert","family":"Richter","sequence":"additional","affiliation":[{"name":"Elettra-Sincrotrone Trieste 2 , Strada Statale 14 - km 163, 5 in AREA Science Park, Basovizza, TS 34149, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0068-679X","authenticated-orcid":false,"given":"Nitish","family":"Pal","sequence":"additional","affiliation":[{"name":"Elettra-Sincrotrone Trieste 2 , Strada Statale 14 - km 163, 5 in AREA Science Park, Basovizza, TS 34149, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4098-8979","authenticated-orcid":false,"given":"Jacopo","family":"Chiarinelli","sequence":"additional","affiliation":[{"name":"CNR-Istituto di Struttura della Materia 3 , Area della Ricerca di Roma 1, Monterotondo, Roma 00015, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6543-6628","authenticated-orcid":false,"given":"Paola","family":"Bolognesi","sequence":"additional","affiliation":[{"name":"CNR-Istituto di Struttura della Materia 3 , Area della Ricerca di Roma 1, Monterotondo, Roma 00015, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2990-7330","authenticated-orcid":false,"given":"Lorenzo","family":"Avaldi","sequence":"additional","affiliation":[{"name":"CNR-Istituto di Struttura della Materia 3 , Area della Ricerca di Roma 1, Monterotondo, Roma 00015, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4135-7404","authenticated-orcid":false,"given":"M. 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