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The long-lived molecular negative ions (MNIs) are the most abundant species detected in the negative ion mass spectra of both compounds. Their electron detachment times are measured to be 50\u201370 \u03bcs. On this basis, the adiabatic electron affinity of [6]helicene is estimated to be 0.81\u00a0eV in excellent agreement with the B3LYP\/6-31+G(d) value (0.79\u00a0eV). The most intriguing finding is a sharp increase in the electron detachment time of [5]helicene MNI observed in the range 0.25\u20130.5\u00a0eV that contradicts the obvious tendency of electron detachment times to decrease as incident electron energy rises. This unusual effect is explained by the formation of the most stable re-arranged planar MNI, which loses its initial chirality, a process being supposed to be possible only in [5]helicene MNI initially formed through the \u03c03* shape resonance. The present findings can be of importance to understanding the spin-filtering effects produced by helical molecules since transmission of low-energy photoelectrons through ordered enantiopure molecular layers can be considered as the formation of the temporary negative ion states and their decay by electron detachment.<\/jats:p>","DOI":"10.1063\/5.0354302","type":"journal-article","created":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T11:41:42Z","timestamp":1792755702000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Low-energy electron attachment, autodetachment, and electron-induced processes in the smallest helicene molecules"],"prefix":"10.1063","volume":"165","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5318-3638","authenticated-orcid":false,"given":"Stanislav A.","family":"Pshenichnyuk","sequence":"first","affiliation":[{"name":"Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences 1 , Prospe\u043at Oktyabrya 151, 450075 Ufa,","place":["Russia"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0289-5648","authenticated-orcid":false,"given":"Nail L.","family":"Asfandiarov","sequence":"additional","affiliation":[{"name":"Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences 1 , Prospe\u043at Oktyabrya 151, 450075 Ufa,","place":["Russia"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Georgy S.","family":"Pshenichnyuk","sequence":"additional","affiliation":[{"name":"Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences 1 , Prospe\u043at Oktyabrya 151, 450075 Ufa,","place":["Russia"]},{"name":"Physico-Technical Institute, Ufa University of Science and Technology 2 , Zaki Validi Str., 32, 450076 Ufa,","place":["Russia"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6157-5874","authenticated-orcid":false,"given":"Oleg E.","family":"Tereshchenko","sequence":"additional","affiliation":[{"name":"Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences 3 , Lavrentyev Prospe\u043at 13, 630090 Novosibirsk,","place":["Russia"]},{"name":"Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences 4 , Prospe\u043at Nikolsky 1, 630559 Koltsovo,","place":["Russia"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,10,23]]},"reference":[{"key":"2026102307413670500_c1","doi-asserted-by":"crossref","DOI":"10.1002\/9783527829415","volume-title":"Helicenes: Synthesis, Properties, and Applications","author":"Crassous","year":"2022"},{"issue":"3","key":"2026102307413670500_c2","doi-asserted-by":"publisher","first-page":"1463","DOI":"10.1021\/cr200087r","article-title":"Helicenes: Synthesis and applications","volume":"112","year":"2012","journal-title":"Chem. 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