{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:WBQI7PZ34CTFYPBQQS676KOMYR","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":"d4e30e7257440b634c874370c078b0701f269a14262cf2bf2082560409cb7df4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-07-14T14:20:10Z","title_canon_sha256":"45ade585e7d8d0439aa578189a18ec08e78118f6ca7911d7ed0dd220263117f8"},"schema_version":"1.0","source":{"id":"0907.2366","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.2366","created_at":"2026-05-18T02:13:03Z"},{"alias_kind":"arxiv_version","alias_value":"0907.2366v1","created_at":"2026-05-18T02:13:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.2366","created_at":"2026-05-18T02:13:03Z"},{"alias_kind":"pith_short_12","alias_value":"WBQI7PZ34CTF","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"WBQI7PZ34CTFYPBQ","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"WBQI7PZ3","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:cf8100287c21a14247518f588321324aad58d82cf97721dbc5ff9aeff7ec410e","target":"graph","created_at":"2026-05-18T02:13:03Z","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":"Hydrogen and deuterium chemisorption on a single layer of graphene has been studied by path-integral molecular dynamics simulations. Finite-temperature properties of these point defects were analyzed in the range from 200 to 1500 K, by using a tight-binding potential fitted to density-functional calculations. On one side, vibrational properties of the adatoms are studied at their equilibrium positions, linked to C atoms. The vibrations display an appreciable anharmonicity, as derived from comparison between kinetic and potential energy, as well as between vibrational energy for hydrogen and de","authors_text":"Carlos P. Herrero, Rafael Ramirez","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-07-14T14:20:10Z","title":"Vibrational properties and diffusion of hydrogen on graphene"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.2366","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:f90e6829fb8d9e87de65d8f33c63648e328b8d82a98d806c6d81d8732b88f327","target":"record","created_at":"2026-05-18T02:13:03Z","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":"d4e30e7257440b634c874370c078b0701f269a14262cf2bf2082560409cb7df4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-07-14T14:20:10Z","title_canon_sha256":"45ade585e7d8d0439aa578189a18ec08e78118f6ca7911d7ed0dd220263117f8"},"schema_version":"1.0","source":{"id":"0907.2366","kind":"arxiv","version":1}},"canonical_sha256":"b0608fbf3be0a65c3c3084bdff29ccc4670a0f9ce091322db5f1534933bb1dfc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b0608fbf3be0a65c3c3084bdff29ccc4670a0f9ce091322db5f1534933bb1dfc","first_computed_at":"2026-05-18T02:13:03.200380Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:03.200380Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WkZrkGQDScw1CbbTcM7o17NQFdry58tr6KjOZjqVlMjF//92q3I/7lIRW/HT26sOLEDyb/FkgCVht1hRJ4HrAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:03.201010Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.2366","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f90e6829fb8d9e87de65d8f33c63648e328b8d82a98d806c6d81d8732b88f327","sha256:cf8100287c21a14247518f588321324aad58d82cf97721dbc5ff9aeff7ec410e"],"state_sha256":"8cf9792878a439c5032467125499fa55c225c653bcc49850f30655646dd092ec"}