{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:MKS4GSZXDKKWYCXZZ2KYUQBAFC","short_pith_number":"pith:MKS4GSZX","canonical_record":{"source":{"id":"1310.4104","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-10-08T22:40:53Z","cross_cats_sorted":[],"title_canon_sha256":"7a8ee21472f643c6bbacb047cf57340f24baf8dd45accf32e432ea5f2ff24140","abstract_canon_sha256":"2bd60071a249f4ab582b6ae684d5f57506322d68d8951245ba0968060facfbc0"},"schema_version":"1.0"},"canonical_sha256":"62a5c34b371a956c0af9ce958a4020288cd2fd7281e79bfc9e269399aa270270","source":{"kind":"arxiv","id":"1310.4104","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.4104","created_at":"2026-05-18T03:10:25Z"},{"alias_kind":"arxiv_version","alias_value":"1310.4104v1","created_at":"2026-05-18T03:10:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.4104","created_at":"2026-05-18T03:10:25Z"},{"alias_kind":"pith_short_12","alias_value":"MKS4GSZXDKKW","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"MKS4GSZXDKKWYCXZ","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"MKS4GSZX","created_at":"2026-05-18T12:27:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:MKS4GSZXDKKWYCXZZ2KYUQBAFC","target":"record","payload":{"canonical_record":{"source":{"id":"1310.4104","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-10-08T22:40:53Z","cross_cats_sorted":[],"title_canon_sha256":"7a8ee21472f643c6bbacb047cf57340f24baf8dd45accf32e432ea5f2ff24140","abstract_canon_sha256":"2bd60071a249f4ab582b6ae684d5f57506322d68d8951245ba0968060facfbc0"},"schema_version":"1.0"},"canonical_sha256":"62a5c34b371a956c0af9ce958a4020288cd2fd7281e79bfc9e269399aa270270","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:10:25.051443Z","signature_b64":"ArTRExY/klfR5XMCG7+dhVP/MoazgQWeFUyiuHtpMpzUqa5qv39FVY96tq8hTd/xoOHgjk2YyV0TTGnDNlp3Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"62a5c34b371a956c0af9ce958a4020288cd2fd7281e79bfc9e269399aa270270","last_reissued_at":"2026-05-18T03:10:25.050680Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:10:25.050680Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1310.4104","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:10:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eWmwvFDymtwXtvDpZcVIu3bKZkb6PriL4KHd7R4astH6HdElbz1en3V8dUNbxkh1i76mKn5CsPMS0WIA05y3CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T02:37:27.297083Z"},"content_sha256":"81ddf5d76dc25c3d9a4b4e8f8de8a20484307b73f2ea9166bfd81df006c33035","schema_version":"1.0","event_id":"sha256:81ddf5d76dc25c3d9a4b4e8f8de8a20484307b73f2ea9166bfd81df006c33035"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:MKS4GSZXDKKWYCXZZ2KYUQBAFC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Implementation of van der Waals Density Functional Approach to the Spin-Polarized System: Interaction Potential between Oxygen Molecules","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Ikutaro Hamada, Makoto Nakamura, Masao Obata, Tatsuki Oda","submitted_at":"2013-10-08T22:40:53Z","abstract_excerpt":"We propose a practical approach to spin-polarized systems within the van der Waals density functional (vdW-DF). The method was applied to a gas phase oxygen molecule and a parallel (H-type) pair of oxygen molecules. It was found that vdW-DF improves the equilibrium distance and binding energy. In particular, one type of vdW-DF can describe such systems reasonably well. The van der Waals interaction has been confirmed to have an energy comparable to the magnetic one, while emerging at a distance rather longer than the latter."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.4104","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:10:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"a5oKC4QxkDU0h2O0ZYHzuD7nYqVmKFhz6g8qvew3luLMtx+1XEkCa++l6AuOACW++j/zOS145Jt75MwsGDjlCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T02:37:27.297665Z"},"content_sha256":"47714261b22e1c26a0afc570debfc3dd69b6c15754425de0c5993cab1ba79681","schema_version":"1.0","event_id":"sha256:47714261b22e1c26a0afc570debfc3dd69b6c15754425de0c5993cab1ba79681"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MKS4GSZXDKKWYCXZZ2KYUQBAFC/bundle.json","state_url":"https://pith.science/pith/MKS4GSZXDKKWYCXZZ2KYUQBAFC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MKS4GSZXDKKWYCXZZ2KYUQBAFC/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-01T02:37:27Z","links":{"resolver":"https://pith.science/pith/MKS4GSZXDKKWYCXZZ2KYUQBAFC","bundle":"https://pith.science/pith/MKS4GSZXDKKWYCXZZ2KYUQBAFC/bundle.json","state":"https://pith.science/pith/MKS4GSZXDKKWYCXZZ2KYUQBAFC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MKS4GSZXDKKWYCXZZ2KYUQBAFC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:MKS4GSZXDKKWYCXZZ2KYUQBAFC","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":"2bd60071a249f4ab582b6ae684d5f57506322d68d8951245ba0968060facfbc0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-10-08T22:40:53Z","title_canon_sha256":"7a8ee21472f643c6bbacb047cf57340f24baf8dd45accf32e432ea5f2ff24140"},"schema_version":"1.0","source":{"id":"1310.4104","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.4104","created_at":"2026-05-18T03:10:25Z"},{"alias_kind":"arxiv_version","alias_value":"1310.4104v1","created_at":"2026-05-18T03:10:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.4104","created_at":"2026-05-18T03:10:25Z"},{"alias_kind":"pith_short_12","alias_value":"MKS4GSZXDKKW","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"MKS4GSZXDKKWYCXZ","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"MKS4GSZX","created_at":"2026-05-18T12:27:52Z"}],"graph_snapshots":[{"event_id":"sha256:47714261b22e1c26a0afc570debfc3dd69b6c15754425de0c5993cab1ba79681","target":"graph","created_at":"2026-05-18T03:10:25Z","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 propose a practical approach to spin-polarized systems within the van der Waals density functional (vdW-DF). The method was applied to a gas phase oxygen molecule and a parallel (H-type) pair of oxygen molecules. It was found that vdW-DF improves the equilibrium distance and binding energy. In particular, one type of vdW-DF can describe such systems reasonably well. The van der Waals interaction has been confirmed to have an energy comparable to the magnetic one, while emerging at a distance rather longer than the latter.","authors_text":"Ikutaro Hamada, Makoto Nakamura, Masao Obata, Tatsuki Oda","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-10-08T22:40:53Z","title":"Implementation of van der Waals Density Functional Approach to the Spin-Polarized System: Interaction Potential between Oxygen Molecules"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.4104","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":"sha256:81ddf5d76dc25c3d9a4b4e8f8de8a20484307b73f2ea9166bfd81df006c33035","target":"record","created_at":"2026-05-18T03:10:25Z","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":"2bd60071a249f4ab582b6ae684d5f57506322d68d8951245ba0968060facfbc0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-10-08T22:40:53Z","title_canon_sha256":"7a8ee21472f643c6bbacb047cf57340f24baf8dd45accf32e432ea5f2ff24140"},"schema_version":"1.0","source":{"id":"1310.4104","kind":"arxiv","version":1}},"canonical_sha256":"62a5c34b371a956c0af9ce958a4020288cd2fd7281e79bfc9e269399aa270270","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"62a5c34b371a956c0af9ce958a4020288cd2fd7281e79bfc9e269399aa270270","first_computed_at":"2026-05-18T03:10:25.050680Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:10:25.050680Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ArTRExY/klfR5XMCG7+dhVP/MoazgQWeFUyiuHtpMpzUqa5qv39FVY96tq8hTd/xoOHgjk2YyV0TTGnDNlp3Aw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:10:25.051443Z","signed_message":"canonical_sha256_bytes"},"source_id":"1310.4104","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:81ddf5d76dc25c3d9a4b4e8f8de8a20484307b73f2ea9166bfd81df006c33035","sha256:47714261b22e1c26a0afc570debfc3dd69b6c15754425de0c5993cab1ba79681"],"state_sha256":"9c61762ec8b93fe629afe57e5c85c02f87b6f3f5f040b703311352c4f89d6b55"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ksID3L2Mq6LkAg56fOcU9ezhmNdQf6LLVwJmks5/QH1NjmIWOEjW2KvkPDOmTejapHapLWagBSnRtO6O6N7mBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T02:37:27.301196Z","bundle_sha256":"09c43379a5ed1c9d9882c3653b5bf7888078ed095d0694e071c9fbb4ab3d3999"}}