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The frequency shifts of the clock transitions due to external fields and the corresponding uncertainties are calculated. Several competitive $^A$Ra$^+$ candidates with $A=$ 223 - 229 are identified. In particular, we show that the transition $7s\\,^2S_{1/2}\\,(F=2,m_F=0)$ - $6d\\,^2D_{3/2}\\,(F=0,m_F=0)$ at 828 nm in $^{223}$Ra$^+$, with no linear Zeeman and electric quadrupole shifts, stands out as a relatively simple case"},"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":"1102.4988","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2011-02-24T13:42:10Z","cross_cats_sorted":[],"title_canon_sha256":"2bb4afaadc2e56c8a197568205513ec6a7e01caee00c2962d4752b919c501b64","abstract_canon_sha256":"506374892372fb88cd80cfa1e978ba0b36fbc391539247c0c4764fb2dd528e09"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:27:57.614352Z","signature_b64":"gJui9R4FjUaZnxpfn90EOYQ7SsPfja5PR0g3wp8zOpXcKoV2QNJqHFzLw7iN6+VZT1kZxsSQyjOofJn7Jj42BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"104e61f774094734713c3f95942f4ba71505df64ea02cf8fc0371d2944b74df5","last_reissued_at":"2026-05-18T04:27:57.613866Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:27:57.613866Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Radium single-ion optical clock","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"H. 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In particular, we show that the transition $7s\\,^2S_{1/2}\\,(F=2,m_F=0)$ - $6d\\,^2D_{3/2}\\,(F=0,m_F=0)$ at 828 nm in $^{223}$Ra$^+$, with no linear Zeeman and electric quadrupole shifts, stands out as a relatively simple case"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1102.4988","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1102.4988","created_at":"2026-05-18T04:27:57.613935+00:00"},{"alias_kind":"arxiv_version","alias_value":"1102.4988v1","created_at":"2026-05-18T04:27:57.613935+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1102.4988","created_at":"2026-05-18T04:27:57.613935+00:00"},{"alias_kind":"pith_short_12","alias_value":"CBHGD53UBFDT","created_at":"2026-05-18T12:26:26.731475+00:00"},{"alias_kind":"pith_short_16","alias_value":"CBHGD53UBFDTI4J4","created_at":"2026-05-18T12:26:26.731475+00:00"},{"alias_kind":"pith_short_8","alias_value":"CBHGD53U","created_at":"2026-05-18T12:26:26.731475+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/CBHGD53UBFDTI4J4H6KZIL2LU4","json":"https://pith.science/pith/CBHGD53UBFDTI4J4H6KZIL2LU4.json","graph_json":"https://pith.science/api/pith-number/CBHGD53UBFDTI4J4H6KZIL2LU4/graph.json","events_json":"https://pith.science/api/pith-number/CBHGD53UBFDTI4J4H6KZIL2LU4/events.json","paper":"https://pith.science/paper/CBHGD53U"},"agent_actions":{"view_html":"https://pith.science/pith/CBHGD53UBFDTI4J4H6KZIL2LU4","download_json":"https://pith.science/pith/CBHGD53UBFDTI4J4H6KZIL2LU4.json","view_paper":"https://pith.science/paper/CBHGD53U","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1102.4988&json=true","fetch_graph":"https://pith.science/api/pith-number/CBHGD53UBFDTI4J4H6KZIL2LU4/graph.json","fetch_events":"https://pith.science/api/pith-number/CBHGD53UBFDTI4J4H6KZIL2LU4/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/CBHGD53UBFDTI4J4H6KZIL2LU4/action/timestamp_anchor","attest_storage":"https://pith.science/pith/CBHGD53UBFDTI4J4H6KZIL2LU4/action/storage_attestation","attest_author":"https://pith.science/pith/CBHGD53UBFDTI4J4H6KZIL2LU4/action/author_attestation","sign_citation":"https://pith.science/pith/CBHGD53UBFDTI4J4H6KZIL2LU4/action/citation_signature","submit_replication":"https://pith.science/pith/CBHGD53UBFDTI4J4H6KZIL2LU4/action/replication_record"}},"created_at":"2026-05-18T04:27:57.613935+00:00","updated_at":"2026-05-18T04:27:57.613935+00:00"}