{"paper":{"title":"Hyperfine-Resolved Rovibrational and Rotational Spectroscopy of OH$^+$ ($X ^3\\Sigma^-$)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"A global fit of new and prior data refines the spectroscopic constants of OH+ especially in the ground vibrational state.","cross_cats":["astro-ph.SR","physics.chem-ph"],"primary_cat":"physics.atm-clus","authors_text":"Arshia M. Jacob, Dominik Riechers, Holger S. P. M\\\"uller, Lea Schneider, Oskar Asvany, Pavol Jusko, Stephan Schlemmer, Urs U. Graf, Weslley G. D. P. Silva","submitted_at":"2026-05-12T13:18:42Z","abstract_excerpt":"The OH$^+$ ($X ^3\\Sigma^-$) radical cation has been investigated by combining a 4 K 22-pole ion trap apparatus with high-resolution IR and THz radiation sources. Applying different types of action spectroscopic methods, the fundamental vibrational band in the 3 $\\mu$m range and the spin manifold of the $N=1 \\leftarrow 0$ rotational transition around 1 THz have been extended and refined. Additionally, the spin manifold of the $N=2 \\leftarrow 1$ rotational transition, scattered around 2 THz, has been measured for the first time with microwave accuracy. Although all hyperfine components of the pu"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"A global fit combining rovibrational and pure rotational transitions from the literature with those newly obtained in this work was performed, leading to improvements in the spectroscopic constants of OH+, particularly those in the ground vibrational state.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That simulation of Zeeman-split line contours accurately recovers the field-free center frequencies without residual systematic bias from the magnetic field or trap conditions.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"New hyperfine-resolved measurements of the fundamental vibrational band and the N=2←1 rotational transition of OH+ (X 3Σ−) yield improved spectroscopic constants via global fit.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A global fit of new and prior data refines the spectroscopic constants of OH+ especially in the ground vibrational state.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"3bdf4846e4f66aa1a2229b127f7814199b4462a0b9da504fd7832b02b8dc2c12"},"source":{"id":"2605.12102","kind":"arxiv","version":1},"verdict":{"id":"e0c0d822-00a6-4740-bf9c-8623b854f55d","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-13T03:55:04.048726Z","strongest_claim":"A global fit combining rovibrational and pure rotational transitions from the literature with those newly obtained in this work was performed, leading to improvements in the spectroscopic constants of OH+, particularly those in the ground vibrational state.","one_line_summary":"New hyperfine-resolved measurements of the fundamental vibrational band and the N=2←1 rotational transition of OH+ (X 3Σ−) yield improved spectroscopic constants via global fit.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That simulation of Zeeman-split line contours accurately recovers the field-free center frequencies without residual systematic bias from the magnetic field or trap conditions.","pith_extraction_headline":"A global fit of new and prior data refines the spectroscopic constants of OH+ especially in the ground vibrational state."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.12102/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"ai_meta_artifact","ran_at":"2026-05-26T15:42:41.057612Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_title_agreement","ran_at":"2026-05-20T16:31:26.437597Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-20T11:05:57.398339Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"claim_evidence","ran_at":"2026-05-19T23:01:58.372017Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"89edda18b67e2b8ac79ebd2a80d834c6fdcb76417d0f9ed11490e30e67cf57ef"},"references":{"count":22,"sample":[{"doi":"","year":2010,"title":"Hyperfine-Resolved Rovibrational and Rotational Spectroscopy of OH$^+$ ($X ^3\\Sigma^-$)","work_id":"1a4b61df-d1a3-48be-97be-b63d358128a9","ref_index":1,"cited_arxiv_id":"2605.12102","is_internal_anchor":true},{"doi":"","year":null,"title":"It should be pointed out that the transition dipole moment alone is not always sufficient to model the IR in- tensities, as shown for thev=1−0band of CH +70","work_id":"91843e4c-a78b-42f7-9137-d6eda539c846","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2016,"title":"5 Rotational measurements:N=2←1 The spin manifold of theN=2←1rotational transition of OH + was predicted to fall exactly in the tuning range of one of our THz sources (1.83-2.07 THz 65). The lower sta","work_id":"aa0f80b1-e441-48aa-bb8f-e98ef3c4745b","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2016,"title":"This value agrees well with recent measurements of other open shell species in our laboratory , e.g","work_id":"9c6d640d-fa19-4dae-b013-03cb3dd7819c","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"Briefly , the rovibrational energy levels of a di- atomic molecule can be represented by the Dunham expression E(v,J)/h= ∑ i,j Yi j(v+1/2) iJ j(J+1) j,(1) whereY i j are the Dunham parameters. The ele","work_id":"43f4588c-5c92-4efb-af40-e31817b00f13","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":22,"snapshot_sha256":"9e1ed108b1e544c16bd29a7503d201e83d370f72b57632cd1ddb0f7f2b17830d","internal_anchors":1},"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"}