{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:J7TSCSJR367J5OCBQJX3E4I44S","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":"9f69179dd0697268f3f57dfbc4f133093e6b0dad63988e7150b88885cfa4c44a","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2013-04-11T14:07:08Z","title_canon_sha256":"3b9438489d934ec56c7f0d0f35bca6ed0caa08497536f3f82c6dd625887fa780"},"schema_version":"1.0","source":{"id":"1304.3304","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.3304","created_at":"2026-05-18T03:28:18Z"},{"alias_kind":"arxiv_version","alias_value":"1304.3304v1","created_at":"2026-05-18T03:28:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.3304","created_at":"2026-05-18T03:28:18Z"},{"alias_kind":"pith_short_12","alias_value":"J7TSCSJR367J","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_16","alias_value":"J7TSCSJR367J5OCB","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_8","alias_value":"J7TSCSJR","created_at":"2026-05-18T12:27:49Z"}],"graph_snapshots":[{"event_id":"sha256:4ed7855e88db989f6fde89042f868c2980532a752c81080b3c4abb41a1dc1589","target":"graph","created_at":"2026-05-18T03:28:18Z","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":"Approximate natural orbitals are investigated as a way to improve a Monte Carlo configuration interaction (MCCI) calculation. We introduce a way to approximate the natural orbitals in MCCI and test these and approximate natural orbitals from MP2 and QCISD in MCCI calculations of single-point energies. The efficiency and accuracy of approximate natural orbitals in MCCI potential curve calculations for the double hydrogen dissociation of water, the dissociation of carbon monoxide and the dissociation of the nitrogen molecule are then considered in comparison with standard MCCI when using full co","authors_text":"J. P. Coe, M. J. Paterson","cross_cats":["physics.comp-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2013-04-11T14:07:08Z","title":"Development of Monte Carlo configuration interaction: Natural orbitals and second-order perturbation theory"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.3304","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:c5a438ee04a638867ca46fc26835fc0c2b831714b7a85d8afa5fb27ef1625efa","target":"record","created_at":"2026-05-18T03:28:18Z","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":"9f69179dd0697268f3f57dfbc4f133093e6b0dad63988e7150b88885cfa4c44a","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2013-04-11T14:07:08Z","title_canon_sha256":"3b9438489d934ec56c7f0d0f35bca6ed0caa08497536f3f82c6dd625887fa780"},"schema_version":"1.0","source":{"id":"1304.3304","kind":"arxiv","version":1}},"canonical_sha256":"4fe7214931dfbe9eb841826fb2711ce48edfb32734fcfd42897b8acb6ad8a8ff","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4fe7214931dfbe9eb841826fb2711ce48edfb32734fcfd42897b8acb6ad8a8ff","first_computed_at":"2026-05-18T03:28:18.018516Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:28:18.018516Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GrCIhIGiH4G3XShNoZZLV5JnqEPWC3L0uCOWpHf30TTsgCGThWlxxOlYT53n0RRrQj6CY+LLkrK/Zpuyvc3KAw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:28:18.019192Z","signed_message":"canonical_sha256_bytes"},"source_id":"1304.3304","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c5a438ee04a638867ca46fc26835fc0c2b831714b7a85d8afa5fb27ef1625efa","sha256:4ed7855e88db989f6fde89042f868c2980532a752c81080b3c4abb41a1dc1589"],"state_sha256":"4e2f35b8c353c26a5905081bc7f6b6ca8e55a458c896c22e05a832b5cd6ec898"}