{"paper":{"title":"Rotationally cold OH$^-$ ions in the cryogenic electrostatic ion-beam storage ring DESIREE","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"A. K\\\"allberg, A. Simonsson, E. K. Anderson, G. Eklund, H. Cederquist, H. T. Schmidt, H. Zettergren, K. C. Chartkunchand, M. Gatchell, M. Kami\\'nska, M. K. Kristiansson, N. de Ruette, P. L\\\"ofgren, P. Reinhed, R. D. Thomas, S. Mannervik, S. Ros\\'en","submitted_at":"2018-03-28T10:46:11Z","abstract_excerpt":"We apply near-threshold laser photodetachment to characterize the rotational quantum level distribution of OH$^-$ ions stored in the cryogenic ion-beam storage ring, DESIREE, at Stockholm University. We find that the stored ions relax to a rotational temperature of 13.4$\\pm$0.2 K with 94.9$\\pm$0.3 % of the ions in the rotational ground state. This is consistent with the storage ring temperature of 13.5$\\pm$0.5 K as measured with eight silicon diodes, but in contrast to all earlier studies in cryogenic traps and rings where the rotational temperatures were always much higher than those of the s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.10518","kind":"arxiv","version":2},"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"}