{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:AZ4MN4R2ZQ5CHXDVC6QJU2VHMS","short_pith_number":"pith:AZ4MN4R2","schema_version":"1.0","canonical_sha256":"0678c6f23acc3a23dc7517a09a6aa7649702a9869af9cb53d1842f6fcb396036","source":{"kind":"arxiv","id":"2608.00138","version":1},"attestation_state":"computed","paper":{"title":"Vibrational spectroscopy identifies the bond asymmetry of hexagonal diamond","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Li Zhu","submitted_at":"2026-07-31T14:49:47Z","abstract_excerpt":"Bulk hexagonal diamond has been synthesized by independent routes, but its structure remains contested: the two recent refinements disagree even on the sign of the difference between its two inequivalent bond lengths, 238~m\\AA{} apart, and both depart from an earlier 2003 refinement. Here we test the competing structures with first-principles lattice dynamics. Relaxed hexagonal diamond has an interlayer bond \\emph{longer} than the intralayer bonds by 24~m\\AA{} in both functionals, an effect of its eclipsed conformation that scales with polytype hexagonality. The bright zone-center $A_{1g}$ mod"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2608.00138","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-07-31T14:49:47Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"21f4e2eb9640582a38ce21706af7c1fafec0d09aefe33ec13927bacbe148f070","abstract_canon_sha256":"61ce74c27a25825939a52fcf1c905bd5a983ef61aaec97783ab29393b1062199"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-04T00:33:02.526833Z","signature_b64":"plu0Os6Bn49Ll6rpAzeT755dt4vYuU4Hmhd517tV/R6hsThc7ZiecG/bqQR42Ob3qsoEIkhM13H2T8uH/t9sDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0678c6f23acc3a23dc7517a09a6aa7649702a9869af9cb53d1842f6fcb396036","last_reissued_at":"2026-08-04T00:33:02.525494Z","signature_status":"signed_v1","first_computed_at":"2026-08-04T00:33:02.525494Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Vibrational spectroscopy identifies the bond asymmetry of hexagonal diamond","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Li Zhu","submitted_at":"2026-07-31T14:49:47Z","abstract_excerpt":"Bulk hexagonal diamond has been synthesized by independent routes, but its structure remains contested: the two recent refinements disagree even on the sign of the difference between its two inequivalent bond lengths, 238~m\\AA{} apart, and both depart from an earlier 2003 refinement. Here we test the competing structures with first-principles lattice dynamics. Relaxed hexagonal diamond has an interlayer bond \\emph{longer} than the intralayer bonds by 24~m\\AA{} in both functionals, an effect of its eclipsed conformation that scales with polytype hexagonality. The bright zone-center $A_{1g}$ mod"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.00138","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2608.00138/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2608.00138","created_at":"2026-08-04T00:33:02.526511+00:00"},{"alias_kind":"arxiv_version","alias_value":"2608.00138v1","created_at":"2026-08-04T00:33:02.526511+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.00138","created_at":"2026-08-04T00:33:02.526511+00:00"},{"alias_kind":"pith_short_12","alias_value":"AZ4MN4R2ZQ5C","created_at":"2026-08-04T00:33:02.526511+00:00"},{"alias_kind":"pith_short_16","alias_value":"AZ4MN4R2ZQ5CHXDV","created_at":"2026-08-04T00:33:02.526511+00:00"},{"alias_kind":"pith_short_8","alias_value":"AZ4MN4R2","created_at":"2026-08-04T00:33:02.526511+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS","json":"https://pith.science/pith/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS.json","graph_json":"https://pith.science/api/pith-number/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS/graph.json","events_json":"https://pith.science/api/pith-number/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS/events.json","paper":"https://pith.science/paper/AZ4MN4R2"},"agent_actions":{"view_html":"https://pith.science/pith/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS","download_json":"https://pith.science/pith/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS.json","view_paper":"https://pith.science/paper/AZ4MN4R2","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2608.00138&json=true","fetch_graph":"https://pith.science/api/pith-number/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS/graph.json","fetch_events":"https://pith.science/api/pith-number/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS/action/timestamp_anchor","attest_storage":"https://pith.science/pith/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS/action/storage_attestation","attest_author":"https://pith.science/pith/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS/action/author_attestation","sign_citation":"https://pith.science/pith/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS/action/citation_signature","submit_replication":"https://pith.science/pith/AZ4MN4R2ZQ5CHXDVC6QJU2VHMS/action/replication_record"}},"created_at":"2026-08-04T00:33:02.526511+00:00","updated_at":"2026-08-04T00:33:02.526511+00:00"}