{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2012:RV5YPYKWGWTZE3DYNCQH6GJKBT","short_pith_number":"pith:RV5YPYKW","schema_version":"1.0","canonical_sha256":"8d7b87e15635a7926c7868a07f192a0cd06365123aadce40f8bf9b21f3f1f9c5","source":{"kind":"arxiv","id":"1208.2994","version":3},"attestation_state":"computed","paper":{"title":"Nanoscale structuring of tungsten tip yields most coherent electron point-source","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"cond-mat.mes-hall","authors_text":"A. Peter Legg, Jason Pitters, Josh Y. Mutus, Lucian Livadaru, Radovan Urban, Robert A. Wolkow","submitted_at":"2012-08-14T23:52:06Z","abstract_excerpt":"This report demonstrates the most spatially-coherent electron source ever reported. A coherence angle of 14.3 +/- 0.5 degrees was measured, indicating a virtual source size of 1.7 +/-0.6 Angstrom using an extraction voltage of 89.5 V. The nanotips under study were crafted using a spatially-confined, field-assisted nitrogen etch which removes material from the periphery of the tip apex resulting in a sharp, tungsten-nitride stabilized, high-aspect ratio source. The coherence properties are deduced from holographic measurements in a low-energy electron point source microscope with a carbon nanot"},"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":"1208.2994","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-08-14T23:52:06Z","cross_cats_sorted":["physics.ins-det"],"title_canon_sha256":"ca105c138c79293358bb5849b06e66bf10dec89c08060a40fb62e981887bcb62","abstract_canon_sha256":"6fe39b595b181fe10e10a87f080cb4dcb32cd338fefbe32280c2337fa0a9adbd"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:16:29.102848Z","signature_b64":"U9gePFDOTgdI8+GP6Rf/AI+/Ukqw3aktwVWUkcbjS82mgdB4JbOdf+/uEGLKrnqBPcS79EEXI4An4Og8No6gBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8d7b87e15635a7926c7868a07f192a0cd06365123aadce40f8bf9b21f3f1f9c5","last_reissued_at":"2026-05-18T03:16:29.102017Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:16:29.102017Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Nanoscale structuring of tungsten tip yields most coherent electron point-source","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"cond-mat.mes-hall","authors_text":"A. Peter Legg, Jason Pitters, Josh Y. Mutus, Lucian Livadaru, Radovan Urban, Robert A. Wolkow","submitted_at":"2012-08-14T23:52:06Z","abstract_excerpt":"This report demonstrates the most spatially-coherent electron source ever reported. A coherence angle of 14.3 +/- 0.5 degrees was measured, indicating a virtual source size of 1.7 +/-0.6 Angstrom using an extraction voltage of 89.5 V. The nanotips under study were crafted using a spatially-confined, field-assisted nitrogen etch which removes material from the periphery of the tip apex resulting in a sharp, tungsten-nitride stabilized, high-aspect ratio source. The coherence properties are deduced from holographic measurements in a low-energy electron point source microscope with a carbon nanot"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.2994","kind":"arxiv","version":3},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1208.2994","created_at":"2026-05-18T03:16:29.102136+00:00"},{"alias_kind":"arxiv_version","alias_value":"1208.2994v3","created_at":"2026-05-18T03:16:29.102136+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.2994","created_at":"2026-05-18T03:16:29.102136+00:00"},{"alias_kind":"pith_short_12","alias_value":"RV5YPYKWGWTZ","created_at":"2026-05-18T12:27:20.899486+00:00"},{"alias_kind":"pith_short_16","alias_value":"RV5YPYKWGWTZE3DY","created_at":"2026-05-18T12:27:20.899486+00:00"},{"alias_kind":"pith_short_8","alias_value":"RV5YPYKW","created_at":"2026-05-18T12:27:20.899486+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/RV5YPYKWGWTZE3DYNCQH6GJKBT","json":"https://pith.science/pith/RV5YPYKWGWTZE3DYNCQH6GJKBT.json","graph_json":"https://pith.science/api/pith-number/RV5YPYKWGWTZE3DYNCQH6GJKBT/graph.json","events_json":"https://pith.science/api/pith-number/RV5YPYKWGWTZE3DYNCQH6GJKBT/events.json","paper":"https://pith.science/paper/RV5YPYKW"},"agent_actions":{"view_html":"https://pith.science/pith/RV5YPYKWGWTZE3DYNCQH6GJKBT","download_json":"https://pith.science/pith/RV5YPYKWGWTZE3DYNCQH6GJKBT.json","view_paper":"https://pith.science/paper/RV5YPYKW","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1208.2994&json=true","fetch_graph":"https://pith.science/api/pith-number/RV5YPYKWGWTZE3DYNCQH6GJKBT/graph.json","fetch_events":"https://pith.science/api/pith-number/RV5YPYKWGWTZE3DYNCQH6GJKBT/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/RV5YPYKWGWTZE3DYNCQH6GJKBT/action/timestamp_anchor","attest_storage":"https://pith.science/pith/RV5YPYKWGWTZE3DYNCQH6GJKBT/action/storage_attestation","attest_author":"https://pith.science/pith/RV5YPYKWGWTZE3DYNCQH6GJKBT/action/author_attestation","sign_citation":"https://pith.science/pith/RV5YPYKWGWTZE3DYNCQH6GJKBT/action/citation_signature","submit_replication":"https://pith.science/pith/RV5YPYKWGWTZE3DYNCQH6GJKBT/action/replication_record"}},"created_at":"2026-05-18T03:16:29.102136+00:00","updated_at":"2026-05-18T03:16:29.102136+00:00"}