{"paper":{"title":"The frequency of the ultranarrow ${^1\\text{S}_0} - {^3\\text{P}_2}$ transition in $^{87}\\text{Sr}$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.quant-gas"],"primary_cat":"physics.atom-ph","authors_text":"Alexander Urech, Chun-Chia Chen, Florian Schreck, Georgios A. Siviloglou, Oleksiy Onishchenko, Sergey Pyatchenkov, Shayne Bennetts","submitted_at":"2018-12-05T17:11:40Z","abstract_excerpt":"We determine the frequency of the ultranarrow $^{87}\\text{Sr}$ ${^{1}\\text{S}_{0}} - {^{3}\\text{P}_{2}}$ transition by spectroscopy of an ultracold gas. This transition is referenced to four molecular iodine lines that are observed by Doppler-free saturation spectroscopy of hot iodine vapor. The frequency differences between the Sr and the I$_2$ transitions are measured with an uncertainty of 250 kHz. The absolute frequency of the $^{87}\\text{Sr}$ ${^{1}\\text{S}_{0}} - {^{3}\\text{P}_{2}}$ ($\\text{F}'=7/2$) transition is 446648775(30) MHz and limited in accuracy by the iodine reference. This wo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.02115","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"}