{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:I2TIT7YI3NJEBBPH7BUHWKUWYQ","short_pith_number":"pith:I2TIT7YI","canonical_record":{"source":{"id":"1801.01356","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-01-04T14:11:33Z","cross_cats_sorted":[],"title_canon_sha256":"6a58a7f0c90d33ddedf7f5fe906bc9af3a094cba42eefd56695c824a2ddf7e50","abstract_canon_sha256":"9207a084fe3d0752be13933c3b02284e51950183e788c54001c7261de3986871"},"schema_version":"1.0"},"canonical_sha256":"46a689ff08db524085e7f8687b2a96c432e6c0b6d42e91108c2464d281a2e043","source":{"kind":"arxiv","id":"1801.01356","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.01356","created_at":"2026-05-18T00:26:42Z"},{"alias_kind":"arxiv_version","alias_value":"1801.01356v1","created_at":"2026-05-18T00:26:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.01356","created_at":"2026-05-18T00:26:42Z"},{"alias_kind":"pith_short_12","alias_value":"I2TIT7YI3NJE","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"I2TIT7YI3NJEBBPH","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"I2TIT7YI","created_at":"2026-05-18T12:32:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:I2TIT7YI3NJEBBPH7BUHWKUWYQ","target":"record","payload":{"canonical_record":{"source":{"id":"1801.01356","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-01-04T14:11:33Z","cross_cats_sorted":[],"title_canon_sha256":"6a58a7f0c90d33ddedf7f5fe906bc9af3a094cba42eefd56695c824a2ddf7e50","abstract_canon_sha256":"9207a084fe3d0752be13933c3b02284e51950183e788c54001c7261de3986871"},"schema_version":"1.0"},"canonical_sha256":"46a689ff08db524085e7f8687b2a96c432e6c0b6d42e91108c2464d281a2e043","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:26:42.365559Z","signature_b64":"pgnn9YF3v9hKFY6CXpmHYIu8cHQZlfnc0DtaI2GL8xZUNYrEN28Y82AmQgFQpn2dTC1uSOvtvbnHi1DK+82BAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"46a689ff08db524085e7f8687b2a96c432e6c0b6d42e91108c2464d281a2e043","last_reissued_at":"2026-05-18T00:26:42.364783Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:26:42.364783Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.01356","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":"2026-05-18T00:26:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ATyEvjiMB+bx8NlNt68dFeQX98F0MSDFdguYXMd9ADSDJmQfrhRbYw8ymncRys5lnCB5dc5NGqkPOsTIYaPbAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T09:58:40.507544Z"},"content_sha256":"46f218f48314b63e3177be2bc3f5b6c31c3380427b4820ecc0498c6413947000","schema_version":"1.0","event_id":"sha256:46f218f48314b63e3177be2bc3f5b6c31c3380427b4820ecc0498c6413947000"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:I2TIT7YI3NJEBBPH7BUHWKUWYQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Intercalation of hydrogen in the SiC/epitaxial graphene interface","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Jan Kunc, Martin Rejhon, Pavel Hl\\'idek","submitted_at":"2018-01-04T14:11:33Z","abstract_excerpt":"We have measured optical absorption in mid-infrared spectral range on hydrogen intercalated epitaxial graphene grown on silicon face of SiC. We have used attenuated total reflection geometry to enhance absorption related to the surface and SiC/graphene interface. The samples of epitaxial graphene have been intercalated in the temperature range of 790 to 1250$^\\circ$C and compared to the reference samples of hydrogen etched SiC. We have found that although the Si-H bonds form at as low temperatures as 790$^\\circ$C, the well developed bond order has been reached only for epitaxial graphene inter"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.01356","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":"2026-05-18T00:26:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RFRQPhqugwOJaIjRJTone1iMoXV3LGtun0bazacpOUZ3V/gUqfMFcT+4yOoUHEc/cNb++SVRB9nKx4MFHO7XDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T09:58:40.508341Z"},"content_sha256":"3a9b2b1dcb1631dc69dfe5e91aa8f1df1188922eedf4de6c1a40925f84d40809","schema_version":"1.0","event_id":"sha256:3a9b2b1dcb1631dc69dfe5e91aa8f1df1188922eedf4de6c1a40925f84d40809"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/I2TIT7YI3NJEBBPH7BUHWKUWYQ/bundle.json","state_url":"https://pith.science/pith/I2TIT7YI3NJEBBPH7BUHWKUWYQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/I2TIT7YI3NJEBBPH7BUHWKUWYQ/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":"2026-05-31T09:58:40Z","links":{"resolver":"https://pith.science/pith/I2TIT7YI3NJEBBPH7BUHWKUWYQ","bundle":"https://pith.science/pith/I2TIT7YI3NJEBBPH7BUHWKUWYQ/bundle.json","state":"https://pith.science/pith/I2TIT7YI3NJEBBPH7BUHWKUWYQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/I2TIT7YI3NJEBBPH7BUHWKUWYQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:I2TIT7YI3NJEBBPH7BUHWKUWYQ","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":"9207a084fe3d0752be13933c3b02284e51950183e788c54001c7261de3986871","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-01-04T14:11:33Z","title_canon_sha256":"6a58a7f0c90d33ddedf7f5fe906bc9af3a094cba42eefd56695c824a2ddf7e50"},"schema_version":"1.0","source":{"id":"1801.01356","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.01356","created_at":"2026-05-18T00:26:42Z"},{"alias_kind":"arxiv_version","alias_value":"1801.01356v1","created_at":"2026-05-18T00:26:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.01356","created_at":"2026-05-18T00:26:42Z"},{"alias_kind":"pith_short_12","alias_value":"I2TIT7YI3NJE","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"I2TIT7YI3NJEBBPH","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"I2TIT7YI","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:3a9b2b1dcb1631dc69dfe5e91aa8f1df1188922eedf4de6c1a40925f84d40809","target":"graph","created_at":"2026-05-18T00:26:42Z","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 have measured optical absorption in mid-infrared spectral range on hydrogen intercalated epitaxial graphene grown on silicon face of SiC. We have used attenuated total reflection geometry to enhance absorption related to the surface and SiC/graphene interface. The samples of epitaxial graphene have been intercalated in the temperature range of 790 to 1250$^\\circ$C and compared to the reference samples of hydrogen etched SiC. We have found that although the Si-H bonds form at as low temperatures as 790$^\\circ$C, the well developed bond order has been reached only for epitaxial graphene inter","authors_text":"Jan Kunc, Martin Rejhon, Pavel Hl\\'idek","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-01-04T14:11:33Z","title":"Intercalation of hydrogen in the SiC/epitaxial graphene interface"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.01356","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":"sha256:46f218f48314b63e3177be2bc3f5b6c31c3380427b4820ecc0498c6413947000","target":"record","created_at":"2026-05-18T00:26:42Z","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":"9207a084fe3d0752be13933c3b02284e51950183e788c54001c7261de3986871","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-01-04T14:11:33Z","title_canon_sha256":"6a58a7f0c90d33ddedf7f5fe906bc9af3a094cba42eefd56695c824a2ddf7e50"},"schema_version":"1.0","source":{"id":"1801.01356","kind":"arxiv","version":1}},"canonical_sha256":"46a689ff08db524085e7f8687b2a96c432e6c0b6d42e91108c2464d281a2e043","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"46a689ff08db524085e7f8687b2a96c432e6c0b6d42e91108c2464d281a2e043","first_computed_at":"2026-05-18T00:26:42.364783Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:26:42.364783Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"pgnn9YF3v9hKFY6CXpmHYIu8cHQZlfnc0DtaI2GL8xZUNYrEN28Y82AmQgFQpn2dTC1uSOvtvbnHi1DK+82BAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:26:42.365559Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.01356","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:46f218f48314b63e3177be2bc3f5b6c31c3380427b4820ecc0498c6413947000","sha256:3a9b2b1dcb1631dc69dfe5e91aa8f1df1188922eedf4de6c1a40925f84d40809"],"state_sha256":"6bb175026cb34cb9a8bbb6462864e6853cad6056d74d8281824594b9e5f8c308"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sV7WnNZJNXfudM3vd7kjhZ490QKlZcQuIB1fMqk37/l46zdm5LCbbpvKK1JpakFGIuwUUVVYPy4aCKkfys90AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T09:58:40.511841Z","bundle_sha256":"2c37b98fc49c6b1339980bfd2d6a9c64a63b805f453c4b111b43fddcefaf2d16"}}