{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:IN6EGALGIJSNMM6THGVYH6XW3U","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"6651f9b9848ef483a28369d6f31954f3408dd4bfdddbaba7a1194ecb9bb35c56","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2013-05-03T16:25:23Z","title_canon_sha256":"e3933e39db03f3cc3acc9246485fb9423e82e156ecf7f4a4ba8afab60c4f4031"},"schema_version":"1.0","source":{"id":"1305.0765","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.0765","created_at":"2026-05-18T03:17:11Z"},{"alias_kind":"arxiv_version","alias_value":"1305.0765v1","created_at":"2026-05-18T03:17:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.0765","created_at":"2026-05-18T03:17:11Z"},{"alias_kind":"pith_short_12","alias_value":"IN6EGALGIJSN","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_16","alias_value":"IN6EGALGIJSNMM6T","created_at":"2026-05-18T12:27:46Z"},{"alias_kind":"pith_short_8","alias_value":"IN6EGALG","created_at":"2026-05-18T12:27:46Z"}],"graph_snapshots":[{"event_id":"sha256:5ae010bc3dd94af418187f4cd63372d4ac2ac7b275b3e571be287bb3e47f084e","target":"graph","created_at":"2026-05-18T03:17:11Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Using resonant two-step laser excitation of trapped 232Th+ ions, we observe 43 previously unknown energy levels within the energy range from 7.3 to 8.3 eV. The high density of states promises a strongly enhanced electronic bridge excitation of the 229mTh nuclear state that is expected in this energy range. From the observation of resonantly enhanced three-photon ionization of Th+, the second ionization potential of thorium can be inferred to lie within the range between 11.9 and 12.3 eV. Pulsed laser radiation in a wide wavelength range from 237 to 289 nm is found to provide efficient photodis","authors_text":"E. Peik, M. V. Okhapkin, N. Nemitz, O. A. Herrera-Sancho","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2013-05-03T16:25:23Z","title":"Energy levels of Th+ between 7.3 and 8.3 eV"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.0765","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:b25118f7c8853e509c1055b8b7227e43b4f7228f1bfc31c69cee0dd7abee63c9","target":"record","created_at":"2026-05-18T03:17:11Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"6651f9b9848ef483a28369d6f31954f3408dd4bfdddbaba7a1194ecb9bb35c56","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2013-05-03T16:25:23Z","title_canon_sha256":"e3933e39db03f3cc3acc9246485fb9423e82e156ecf7f4a4ba8afab60c4f4031"},"schema_version":"1.0","source":{"id":"1305.0765","kind":"arxiv","version":1}},"canonical_sha256":"437c4301664264d633d339ab83faf6dd01abacddf1a1aa666a417888b141e190","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"437c4301664264d633d339ab83faf6dd01abacddf1a1aa666a417888b141e190","first_computed_at":"2026-05-18T03:17:11.340636Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:17:11.340636Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ADH3O4Z9gLZbUSM2PIiSrpCoWZ/zT1vXOwl8ihkOO3YYNiX+IcY+wmGCzy0C+1PyKNXW4enbgovPudfdVIDoDA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:17:11.341357Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.0765","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b25118f7c8853e509c1055b8b7227e43b4f7228f1bfc31c69cee0dd7abee63c9","sha256:5ae010bc3dd94af418187f4cd63372d4ac2ac7b275b3e571be287bb3e47f084e"],"state_sha256":"b92cdd0e099a8a0ec2a3f241616502271730a2bb5a934217096c5001816dc8b1"}