{"paper":{"title":"Nitrogen Cluster Anions","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.atm-clus","authors_text":"Johannes Postler, Nikolaus Weinberger, Olof Echt, Paul Scheier","submitted_at":"2018-05-02T14:13:57Z","abstract_excerpt":"Anions are formed by electron attachment to helium nanodroplets doped with N$_2$. The most prominent ion series is due to odd-numbered N$_m$$^{-}$ with 3 $\\le$ m < 140. Neither N$^{-}$ nor N$_2$$^{-}$ are observed. An appearance energy of 11.5 $\\pm$ 0.5 eV is measured for N$_3$$^{-}$. The yield of N$_m$$^{-}$ averaged over 5 $\\le$ m $\\le$ 21 shows an appearance energy of 9 eV, just above the estimated thermodynamic threshold for formation of N$_3$$^{-}$ from electron attachment to small N$_2$ clusters embedded in helium droplets. These findings support the notion that odd-numbered N$_m$$^{-}$ "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.00835","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}