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The transition frequency and the lifetime of the metastable 7$S_{1/2}$ level are measured to be 417 845 964(30) MHz and 0.60(7) s, respectively. We subsequently employ the 7$S_{1/2}$ level to drive the ions with nanosecond-long 269 nm laser pulses into the 7$P_{1/2}$ level. The latter is connected to the 7$S_{1/2}$ electronic level within the $^{229}$Th nuclear isomer manifold by the strongest available electron-bridge transition, forming a basis for its"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1210.7395","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2012-10-28T03:19:39Z","cross_cats_sorted":[],"title_canon_sha256":"a52abca737b4d2306e71933107bdc948547c3832c5c9cb249b21585eaf639be5","abstract_canon_sha256":"13ae84aec6b6bdcd40c07fee43cde2778e274b6d60b49e459033717bc79e2012"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:53:36.721985Z","signature_b64":"C4YtrtPx7ZI0/kfuh3sGUbB3oqav4eB0znGj57rBNdidsU6kveT2jQ4plvVtQFQUsTEEIw/R/lxfjAL1ht/QCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"690293c56b646fe2300370b71ad6b064ea9b31b80a19b0fef4dcf9e06139cbd8","last_reissued_at":"2026-05-18T01:53:36.721517Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:53:36.721517Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Observation of the 717 nm electric quadrupole transition in triply charged thorium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"A. 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