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Using a coincidence ion imaging spectrometer, we identify two distinct dissociation mechanisms: prompt decomposition, characterized by localized correlation islands in time-of-flight spectra, and delayed fragmentation, evidenced by elongated spectral tails. Kinetic energy release distributions indicate that the deprotonation channel (HCN2+ \u2192 H+ + CN+) stems from low-lying electronic states of the dication, aligning with prior photon double-ionization studies. However, metastable state lifetimes exhibit significant prolongation compared to photon-induced processes. Calculations of potential energy surfaces combined with reaction rate theory suggest that this discrepancy may arise from differences in vibrational state populations between the two ionization methods.<\/jats:p>","DOI":"10.1063\/5.0278748","type":"journal-article","created":{"date-parts":[[2025,7,9]],"date-time":"2025-07-09T11:56:27Z","timestamp":1752062187000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["Prompt and delayed dissociation dynamics of dicationic HCN induced by electron impact"],"prefix":"10.1063","volume":"163","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-9486-3995","authenticated-orcid":false,"given":"Xingyu","family":"Guo","sequence":"first","affiliation":[{"name":"Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China , Hefei 230026,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5703-6501","authenticated-orcid":false,"given":"Enliang","family":"Wang","sequence":"additional","affiliation":[{"name":"Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China , Hefei 230026,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1088-874X","authenticated-orcid":false,"given":"Wenchao","family":"Zhao","sequence":"additional","affiliation":[{"name":"Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China , Hefei 230026,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenguang","family":"Wu","sequence":"additional","affiliation":[{"name":"Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China , Hefei 230026,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhaopeng","family":"Xing","sequence":"additional","affiliation":[{"name":"Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China , Hefei 230026,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9377-6649","authenticated-orcid":false,"given":"Lei","family":"Chen","sequence":"additional","affiliation":[{"name":"Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China , Hefei 230026,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5978-1644","authenticated-orcid":false,"given":"Chunkai","family":"Xu","sequence":"additional","affiliation":[{"name":"Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China , Hefei 230026,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5432-1289","authenticated-orcid":false,"given":"Xu","family":"Shan","sequence":"additional","affiliation":[{"name":"Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China , Hefei 230026,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4354-9330","authenticated-orcid":false,"given":"Xiangjun","family":"Chen","sequence":"additional","affiliation":[{"name":"Hefei National Research Center for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China , Hefei 230026,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2025,7,9]]},"reference":[{"key":"2025070907562261700_c1","doi-asserted-by":"publisher","first-page":"271","DOI":"10.1086\/382999","volume":"606","year":"2004","journal-title":"Astrophys. 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