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A comparison between the linear anthracene and angular phenanthrene ions highlights how topological effects govern the degree of electronic delocalization in the excited state, resulting in spectroscopic signatures of vibronic coupling, varying oscillator strengths, and nonradiative relaxation pathways. This work presents the UV\u2013vis spectra of the cationic, protonated, and anionic C14H10 isomers utilizing He-tagging action spectroscopy via helium nanodroplet isolation. The linear anthracene cations retain a well-resolved vibronic structure, characteristic of delocalized \u03c0-systems, whereas the angular phenanthrene cation produces broader bands typical of enhanced vibronic coupling and a more localized charge distribution. Hydrogenation disrupts conjugation and quenches the vibronic progression most strongly in anthracene. Notably, the broad, weakly structured spectrum of protonated phenanthrene is consistent with the pronounced excited-state twisting predicted by previous calculations. Anionic C14H10, on the other hand, displays weak continua, aligning with low oscillator strengths and rapid autodetachment. Dimerization generally broadens and weakens the absorption features, particularly for phenanthrene, consistent with the coexistence of several low-lying \u03c0-stacked isomers and enhanced vibronic coupling. Comparison with matrix isolation and gas-phase spectra supports the high fidelity of the helium nanodroplet approach.<\/jats:p>","DOI":"10.1021\/acs.jpca.6c04463","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T12:13:48Z","timestamp":1789992828000},"page":"7812-7821","source":"Crossref","is-referenced-by-count":0,"title":["Topology-Controlled Photophysics of Ionized C14H10 Isomers"],"prefix":"10.1021","volume":"130","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-2958-1795","authenticated-orcid":true,"given":"Anna Maria","family":"Reider","sequence":"first","affiliation":[{"name":"University of Innsbruck , Technikerstrasse 25 , ,","place":["Innsbruck, Austria, 6020"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6435-089X","authenticated-orcid":true,"given":"Miriam","family":"Kappe","sequence":"additional","affiliation":[{"name":"University of Innsbruck , Technikerstrasse 25 , ,","place":["Innsbruck, Austria, 6020"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8627-1009","authenticated-orcid":true,"given":"Paul","family":"Martini","sequence":"additional","affiliation":[{"name":"University of Stockholm, AlbaNova , Roslagstullsbacken 21 , ,","place":["Stockholm, Sweden, 11421"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Schmidt","sequence":"additional","affiliation":[{"name":"University of Innsbruck , Technikerstrasse 25 , ,","place":["Innsbruck, Austria, 6020"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9816-3187","authenticated-orcid":true,"given":"Serge A.","family":"Krasnokutski","sequence":"additional","affiliation":[{"name":"University of Jena , Helmholtzweg 3 , ,","place":["Jena, Germany, 07743"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7480-6205","authenticated-orcid":true,"given":"Paul","family":"Scheier","sequence":"additional","affiliation":[{"name":"University of Innsbruck , Technikerstrasse 25 , ,","place":["Innsbruck, Austria, 6020"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,21]]},"reference":[{"key":"2026100108071528500_cit1","doi-asserted-by":"publisher","first-page":"109","DOI":"10.1080\/15275920590952739","article-title":"Combustion-derived\npolycyclic aromatic hydrocarbons in the environment\u2500a review","volume":"6","author":"Lima","year":"2005","journal-title":"Environmental Forensics"},{"key":"2026100108071528500_cit2","doi-asserted-by":"publisher","first-page":"117","DOI":"10.1289\/ehp.94102s4117","article-title":"Atmospheric chemistry of gas-phase\npolycyclic aromatic hydrocarbons:\nformation of atmospheric mutagens","volume":"102","author":"Atkinson","year":"1994","journal-title":"Environ.\nHealth Perspect"},{"key":"2026100108071528500_cit3","doi-asserted-by":"publisher","first-page":"250","DOI":"10.1016\/j.combustflame.2016.09.013","article-title":"Investigating\nrepetitive reaction pathways for the formation of polycyclic aromatic\nhydrocarbons in combustion processes","volume":"180","author":"Hansen","year":"2017","journal-title":"Combust.\nFlame"},{"key":"2026100108071528500_cit4","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1007\/978-0-387-71724-1_1","article-title":"Polycyclic aromatic\nhydrocarbons (PAHs) from coal combustion: emissions, analysis, and\ntoxicology","volume":"192","author":"Liu","year":"2008","journal-title":"Rev. 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