{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:JSHLQPRYSP6RXG2HVZ4VHVVUP7","short_pith_number":"pith:JSHLQPRY","canonical_record":{"source":{"id":"1904.11813","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-04-26T12:54:44Z","cross_cats_sorted":[],"title_canon_sha256":"8849efbd684249e82d4233177519676969a8678c0eea25a2d3d9e83e8b303759","abstract_canon_sha256":"6d32c09fdda5e9d2159e48e5e30fd88bfef4ddbf3dbf9bbb84461b06fa87a78a"},"schema_version":"1.0"},"canonical_sha256":"4c8eb83e3893fd1b9b47ae7953d6b47ffc637eebb6bbd9f946088a5a8da18a16","source":{"kind":"arxiv","id":"1904.11813","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.11813","created_at":"2026-05-17T23:47:40Z"},{"alias_kind":"arxiv_version","alias_value":"1904.11813v1","created_at":"2026-05-17T23:47:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.11813","created_at":"2026-05-17T23:47:40Z"},{"alias_kind":"pith_short_12","alias_value":"JSHLQPRYSP6R","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"JSHLQPRYSP6RXG2H","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"JSHLQPRY","created_at":"2026-05-18T12:33:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:JSHLQPRYSP6RXG2HVZ4VHVVUP7","target":"record","payload":{"canonical_record":{"source":{"id":"1904.11813","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-04-26T12:54:44Z","cross_cats_sorted":[],"title_canon_sha256":"8849efbd684249e82d4233177519676969a8678c0eea25a2d3d9e83e8b303759","abstract_canon_sha256":"6d32c09fdda5e9d2159e48e5e30fd88bfef4ddbf3dbf9bbb84461b06fa87a78a"},"schema_version":"1.0"},"canonical_sha256":"4c8eb83e3893fd1b9b47ae7953d6b47ffc637eebb6bbd9f946088a5a8da18a16","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:47:40.859357Z","signature_b64":"4v8U5M7UOhfcWwA6hQ45KD/KuXiAhVWTHNP55LryHZ3A/EOYCutJUP8994EfbQE/kM18HnWEjq+nOrVFgxNQAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4c8eb83e3893fd1b9b47ae7953d6b47ffc637eebb6bbd9f946088a5a8da18a16","last_reissued_at":"2026-05-17T23:47:40.858721Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:47:40.858721Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.11813","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":"2026-05-17T23:47:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1tWOS3rfM6DmWkys4JEz37okZR+3/auVxqmwIjaEL9u9byPQGUZ0QjAYlFooRG76eDJJ1q/NM4RUzlDwT4pxAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T10:17:50.436965Z"},"content_sha256":"84d5d9b776350bce517f7738f192bb46edbfdc381d3909a9b25c0dab49c151d8","schema_version":"1.0","event_id":"sha256:84d5d9b776350bce517f7738f192bb46edbfdc381d3909a9b25c0dab49c151d8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:JSHLQPRYSP6RXG2HVZ4VHVVUP7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On-Surface Hydrogen-Induced Covalent Coupling of Polycyclic Aromatic Hydrocarbons via a Superhydrogenated Intermediate","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Carlos S\\'anchez-S\\'anchez, Jos\\'e Angel Mart\\'in-Gago, Jos\\'e Ignacio Mart\\'inez, Mar\\'ia Francisca L\\'opez, Nerea Ruiz del Arbol, Pascal Ruffieux, Pedro de Andr\\'es, Roman Fasel","submitted_at":"2019-04-26T12:54:44Z","abstract_excerpt":"The activation and subsequent covalent coupling of polycyclic aromatic hydrocarbons (PAHs) are of great interest in fields like chemistry, energy, biology, or health, among others. However, this is not a trivial process. So far, it is based on the use of catalysts that drive and increase the efficiency of the reaction. Here, we report on an unprecedented method in which the dehydrogenation and covalent coupling is thermally activated in the presence of atomic hydrogen and a surface. This mechanism, which requires of the superhydrogenation of the PAHs, has been characterized by high-resolution "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.11813","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":"2026-05-17T23:47:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"de/SZ4MKNyfa+5slvzusvfYblzi8A62nNLRhVCyMlUUQzJ1cIy0yAaXM1/xkeLqdGDSd6Z4AZ9jF+ZSVl4nQCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T10:17:50.437632Z"},"content_sha256":"7d2e11c804191a1cdb99d40dd8a8afd0c3cb32b0af1c1ac885eaca638e34cc3d","schema_version":"1.0","event_id":"sha256:7d2e11c804191a1cdb99d40dd8a8afd0c3cb32b0af1c1ac885eaca638e34cc3d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JSHLQPRYSP6RXG2HVZ4VHVVUP7/bundle.json","state_url":"https://pith.science/pith/JSHLQPRYSP6RXG2HVZ4VHVVUP7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JSHLQPRYSP6RXG2HVZ4VHVVUP7/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":"2026-05-31T10:17:50Z","links":{"resolver":"https://pith.science/pith/JSHLQPRYSP6RXG2HVZ4VHVVUP7","bundle":"https://pith.science/pith/JSHLQPRYSP6RXG2HVZ4VHVVUP7/bundle.json","state":"https://pith.science/pith/JSHLQPRYSP6RXG2HVZ4VHVVUP7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JSHLQPRYSP6RXG2HVZ4VHVVUP7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:JSHLQPRYSP6RXG2HVZ4VHVVUP7","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":"6d32c09fdda5e9d2159e48e5e30fd88bfef4ddbf3dbf9bbb84461b06fa87a78a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-04-26T12:54:44Z","title_canon_sha256":"8849efbd684249e82d4233177519676969a8678c0eea25a2d3d9e83e8b303759"},"schema_version":"1.0","source":{"id":"1904.11813","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.11813","created_at":"2026-05-17T23:47:40Z"},{"alias_kind":"arxiv_version","alias_value":"1904.11813v1","created_at":"2026-05-17T23:47:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.11813","created_at":"2026-05-17T23:47:40Z"},{"alias_kind":"pith_short_12","alias_value":"JSHLQPRYSP6R","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"JSHLQPRYSP6RXG2H","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"JSHLQPRY","created_at":"2026-05-18T12:33:21Z"}],"graph_snapshots":[{"event_id":"sha256:7d2e11c804191a1cdb99d40dd8a8afd0c3cb32b0af1c1ac885eaca638e34cc3d","target":"graph","created_at":"2026-05-17T23:47:40Z","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":"The activation and subsequent covalent coupling of polycyclic aromatic hydrocarbons (PAHs) are of great interest in fields like chemistry, energy, biology, or health, among others. However, this is not a trivial process. So far, it is based on the use of catalysts that drive and increase the efficiency of the reaction. Here, we report on an unprecedented method in which the dehydrogenation and covalent coupling is thermally activated in the presence of atomic hydrogen and a surface. This mechanism, which requires of the superhydrogenation of the PAHs, has been characterized by high-resolution ","authors_text":"Carlos S\\'anchez-S\\'anchez, Jos\\'e Angel Mart\\'in-Gago, Jos\\'e Ignacio Mart\\'inez, Mar\\'ia Francisca L\\'opez, Nerea Ruiz del Arbol, Pascal Ruffieux, Pedro de Andr\\'es, Roman Fasel","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-04-26T12:54:44Z","title":"On-Surface Hydrogen-Induced Covalent Coupling of Polycyclic Aromatic Hydrocarbons via a Superhydrogenated Intermediate"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.11813","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":"sha256:84d5d9b776350bce517f7738f192bb46edbfdc381d3909a9b25c0dab49c151d8","target":"record","created_at":"2026-05-17T23:47:40Z","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":"6d32c09fdda5e9d2159e48e5e30fd88bfef4ddbf3dbf9bbb84461b06fa87a78a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-04-26T12:54:44Z","title_canon_sha256":"8849efbd684249e82d4233177519676969a8678c0eea25a2d3d9e83e8b303759"},"schema_version":"1.0","source":{"id":"1904.11813","kind":"arxiv","version":1}},"canonical_sha256":"4c8eb83e3893fd1b9b47ae7953d6b47ffc637eebb6bbd9f946088a5a8da18a16","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4c8eb83e3893fd1b9b47ae7953d6b47ffc637eebb6bbd9f946088a5a8da18a16","first_computed_at":"2026-05-17T23:47:40.858721Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:47:40.858721Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4v8U5M7UOhfcWwA6hQ45KD/KuXiAhVWTHNP55LryHZ3A/EOYCutJUP8994EfbQE/kM18HnWEjq+nOrVFgxNQAQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:47:40.859357Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.11813","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:84d5d9b776350bce517f7738f192bb46edbfdc381d3909a9b25c0dab49c151d8","sha256:7d2e11c804191a1cdb99d40dd8a8afd0c3cb32b0af1c1ac885eaca638e34cc3d"],"state_sha256":"8deb3d269045803387bce7079e5811c28432e6d0e08f3d2177bee3733a336c4c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pvXVJpq3aWYIQ8oYkg+hncWYKxRgaH0SZV2F0jvMPxTUJK9OT1kpsfXy5OiUqStdptuRwdWpIqSQI1oBoVI5Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T10:17:50.441267Z","bundle_sha256":"c71123327f7602d53f8f5e116d199c5c1570e2b615fe8ad8ce39ad03862cfa35"}}