{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:BAVSKX32LUPKONFL3O6L55PIYN","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":"d55463eacb7b73e1723b83dc6f6e77809b94ece80ebe92c37f0e60bacc9e6941","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-12-11T14:02:33Z","title_canon_sha256":"7eef7895511715b769c7ad86e06d005c4c5d6819d0495b9a739be1b53962999e"},"schema_version":"1.0","source":{"id":"0912.2234","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0912.2234","created_at":"2026-05-18T02:29:25Z"},{"alias_kind":"arxiv_version","alias_value":"0912.2234v1","created_at":"2026-05-18T02:29:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0912.2234","created_at":"2026-05-18T02:29:25Z"},{"alias_kind":"pith_short_12","alias_value":"BAVSKX32LUPK","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"BAVSKX32LUPKONFL","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"BAVSKX32","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:df95e34394def95dc82051969de74940931a7a5a7920f626574e51d798921e72","target":"graph","created_at":"2026-05-18T02:29:25Z","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":"We present a new possibility for the active frequency stabilization of a laser using transitions in neutral praseodymium. Because of its five outer electrons, this element shows a high density of energy levels leading to an extremely line-rich excitation spectrum with more than 25000 known spectral lines ranging from the UV to the infrared. We demonstrate the active frequency stabilization of a diode laser on several praseodymium lines between 1105 and 1123 nm. The excitation signals were recorded in a hollow cathode lamp and observed via laser-induced fluorescence. These signals are strong en","authors_text":"G. H. Guthoehrlein, J. von Zanthier, S. Oppel, W. Kaenders","cross_cats":["physics.atom-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-12-11T14:02:33Z","title":"Active laser frequency stabilization using neutral praseodymium (Pr)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.2234","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":"sha256:7236d795d0da75a871f775b0ecfbf471084cf71fef0716900fe6e004cf9679c3","target":"record","created_at":"2026-05-18T02:29:25Z","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":"d55463eacb7b73e1723b83dc6f6e77809b94ece80ebe92c37f0e60bacc9e6941","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-12-11T14:02:33Z","title_canon_sha256":"7eef7895511715b769c7ad86e06d005c4c5d6819d0495b9a739be1b53962999e"},"schema_version":"1.0","source":{"id":"0912.2234","kind":"arxiv","version":1}},"canonical_sha256":"082b255f7a5d1ea734abdbbcbef5e8c3405559e47e18bf8a76d7b388fdcbfe1d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"082b255f7a5d1ea734abdbbcbef5e8c3405559e47e18bf8a76d7b388fdcbfe1d","first_computed_at":"2026-05-18T02:29:25.315289Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:29:25.315289Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+x6+RkzCkFQ3EI2ofEIYXqF///iCirRWq52LoiYOMNFLh3l3Nsl8FeiX4f6s+MVhVqlCP/W6LDkCCr0JRykDBw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:29:25.315861Z","signed_message":"canonical_sha256_bytes"},"source_id":"0912.2234","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7236d795d0da75a871f775b0ecfbf471084cf71fef0716900fe6e004cf9679c3","sha256:df95e34394def95dc82051969de74940931a7a5a7920f626574e51d798921e72"],"state_sha256":"e700c35947f2a8f648ff37183195eae8b7df849aee02e1fae738970f459f7a22"}