{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:EJFEKVJUV2S4GS3RO6NBW6M4II","short_pith_number":"pith:EJFEKVJU","canonical_record":{"source":{"id":"2304.06112","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-04-12T18:57:52Z","cross_cats_sorted":[],"title_canon_sha256":"7f5aab38b82ffe45c61220c7594435bdb55bb81ae3b28cc505f11f64def6943d","abstract_canon_sha256":"24d28341fae315551145e1966aaa697aa265745df52e56b040868710e8445fbe"},"schema_version":"1.0"},"canonical_sha256":"224a455534aea5c34b71779a1b799c422ea47c77c32a74a4ed32b818fa5af4e5","source":{"kind":"arxiv","id":"2304.06112","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2304.06112","created_at":"2026-07-05T06:00:38Z"},{"alias_kind":"arxiv_version","alias_value":"2304.06112v1","created_at":"2026-07-05T06:00:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2304.06112","created_at":"2026-07-05T06:00:38Z"},{"alias_kind":"pith_short_12","alias_value":"EJFEKVJUV2S4","created_at":"2026-07-05T06:00:38Z"},{"alias_kind":"pith_short_16","alias_value":"EJFEKVJUV2S4GS3R","created_at":"2026-07-05T06:00:38Z"},{"alias_kind":"pith_short_8","alias_value":"EJFEKVJU","created_at":"2026-07-05T06:00:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:EJFEKVJUV2S4GS3RO6NBW6M4II","target":"record","payload":{"canonical_record":{"source":{"id":"2304.06112","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-04-12T18:57:52Z","cross_cats_sorted":[],"title_canon_sha256":"7f5aab38b82ffe45c61220c7594435bdb55bb81ae3b28cc505f11f64def6943d","abstract_canon_sha256":"24d28341fae315551145e1966aaa697aa265745df52e56b040868710e8445fbe"},"schema_version":"1.0"},"canonical_sha256":"224a455534aea5c34b71779a1b799c422ea47c77c32a74a4ed32b818fa5af4e5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:00:38.655931Z","signature_b64":"1PZTSCI4UpQ97t5OuqZi4wycrk7+1rRiUANslNktOyOBHt1y9ynMUYy7/WiUzhd33eM8ul5RtDSZelHqCvDQBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"224a455534aea5c34b71779a1b799c422ea47c77c32a74a4ed32b818fa5af4e5","last_reissued_at":"2026-07-05T06:00:38.655511Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:00:38.655511Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2304.06112","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":"2026-07-05T06:00:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yd8ijKDrbO+7Xly9QEJqLApBCmKNTao7q4h7uIGBGJn3EsmieMbO8nBKvfPvB/XLCc4k5byT2rzcGGDYPGf1Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T19:02:18.222560Z"},"content_sha256":"8c41da2332d286e091329244628318c1042cc193a6df23b94b783f2279d6f8b6","schema_version":"1.0","event_id":"sha256:8c41da2332d286e091329244628318c1042cc193a6df23b94b783f2279d6f8b6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:EJFEKVJUV2S4GS3RO6NBW6M4II","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Selective thermal evolution of native oxide layer in Nb and Nb3Sn-coated SRF grade Nb: An in-situ angular XPS study","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Alexander Romanenko, Arely Cano, Bing Luo, Grigory V. Eremeev, Jaeyel Lee, Juan R. Zuazo, Martina Martinello, Sam Posen","submitted_at":"2023-04-12T18:57:52Z","abstract_excerpt":"This contribution discusses the results of an in-situ angular XPS study on the thermal evolution of the native oxide layer on Nb3Sn and pure Nb. XPS data were recorded with conventional spectrometers using an AlK(alpha) X-ray source for spectra collected up to 600 C, and an MgK(Alpha) X-rays source for temperatures above 600 C. The effect of the thickness, composition, and thermal stability of that oxide layer is relevant to understanding the functional properties of superconducting radiofrequency (SRF) cavities used in particle accelerators. There is a consensus that oxide plays a role in sur"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2304.06112","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/2304.06112/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T06:00:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7J05/PzYeLafcdeO6pEUdy6GNpxIin3OTZybmgqUWdoP5UIjyKGK9UqGi7kCM1aDzbn1Uf9aHrT+NJJTClXLBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T19:02:18.223205Z"},"content_sha256":"e43aa90de38a31ca68036031e49afa429fc57df936427eec23bffe7bd6031308","schema_version":"1.0","event_id":"sha256:e43aa90de38a31ca68036031e49afa429fc57df936427eec23bffe7bd6031308"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EJFEKVJUV2S4GS3RO6NBW6M4II/bundle.json","state_url":"https://pith.science/pith/EJFEKVJUV2S4GS3RO6NBW6M4II/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EJFEKVJUV2S4GS3RO6NBW6M4II/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":"2026-08-12T19:02:18Z","links":{"resolver":"https://pith.science/pith/EJFEKVJUV2S4GS3RO6NBW6M4II","bundle":"https://pith.science/pith/EJFEKVJUV2S4GS3RO6NBW6M4II/bundle.json","state":"https://pith.science/pith/EJFEKVJUV2S4GS3RO6NBW6M4II/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EJFEKVJUV2S4GS3RO6NBW6M4II/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:EJFEKVJUV2S4GS3RO6NBW6M4II","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":"24d28341fae315551145e1966aaa697aa265745df52e56b040868710e8445fbe","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-04-12T18:57:52Z","title_canon_sha256":"7f5aab38b82ffe45c61220c7594435bdb55bb81ae3b28cc505f11f64def6943d"},"schema_version":"1.0","source":{"id":"2304.06112","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2304.06112","created_at":"2026-07-05T06:00:38Z"},{"alias_kind":"arxiv_version","alias_value":"2304.06112v1","created_at":"2026-07-05T06:00:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2304.06112","created_at":"2026-07-05T06:00:38Z"},{"alias_kind":"pith_short_12","alias_value":"EJFEKVJUV2S4","created_at":"2026-07-05T06:00:38Z"},{"alias_kind":"pith_short_16","alias_value":"EJFEKVJUV2S4GS3R","created_at":"2026-07-05T06:00:38Z"},{"alias_kind":"pith_short_8","alias_value":"EJFEKVJU","created_at":"2026-07-05T06:00:38Z"}],"graph_snapshots":[{"event_id":"sha256:e43aa90de38a31ca68036031e49afa429fc57df936427eec23bffe7bd6031308","target":"graph","created_at":"2026-07-05T06:00:38Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2304.06112/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This contribution discusses the results of an in-situ angular XPS study on the thermal evolution of the native oxide layer on Nb3Sn and pure Nb. XPS data were recorded with conventional spectrometers using an AlK(alpha) X-ray source for spectra collected up to 600 C, and an MgK(Alpha) X-rays source for temperatures above 600 C. The effect of the thickness, composition, and thermal stability of that oxide layer is relevant to understanding the functional properties of superconducting radiofrequency (SRF) cavities used in particle accelerators. There is a consensus that oxide plays a role in sur","authors_text":"Alexander Romanenko, Arely Cano, Bing Luo, Grigory V. Eremeev, Jaeyel Lee, Juan R. Zuazo, Martina Martinello, Sam Posen","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-04-12T18:57:52Z","title":"Selective thermal evolution of native oxide layer in Nb and Nb3Sn-coated SRF grade Nb: An in-situ angular XPS study"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2304.06112","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":"sha256:8c41da2332d286e091329244628318c1042cc193a6df23b94b783f2279d6f8b6","target":"record","created_at":"2026-07-05T06:00:38Z","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":"24d28341fae315551145e1966aaa697aa265745df52e56b040868710e8445fbe","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2023-04-12T18:57:52Z","title_canon_sha256":"7f5aab38b82ffe45c61220c7594435bdb55bb81ae3b28cc505f11f64def6943d"},"schema_version":"1.0","source":{"id":"2304.06112","kind":"arxiv","version":1}},"canonical_sha256":"224a455534aea5c34b71779a1b799c422ea47c77c32a74a4ed32b818fa5af4e5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"224a455534aea5c34b71779a1b799c422ea47c77c32a74a4ed32b818fa5af4e5","first_computed_at":"2026-07-05T06:00:38.655511Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:00:38.655511Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1PZTSCI4UpQ97t5OuqZi4wycrk7+1rRiUANslNktOyOBHt1y9ynMUYy7/WiUzhd33eM8ul5RtDSZelHqCvDQBA==","signature_status":"signed_v1","signed_at":"2026-07-05T06:00:38.655931Z","signed_message":"canonical_sha256_bytes"},"source_id":"2304.06112","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8c41da2332d286e091329244628318c1042cc193a6df23b94b783f2279d6f8b6","sha256:e43aa90de38a31ca68036031e49afa429fc57df936427eec23bffe7bd6031308"],"state_sha256":"933ea01274c1e3b77a8cbfbfe6d6df13ecff1f6c3cdeed727edfe158e58e65a5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qU8milj0EvtXkan2khOcKDyI8pK6eA3oqSIt2ZQFBaxG58Jb19uY0jL7pFYCzGh+rITAcY7AJRKSXyhDA1weBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-12T19:02:18.228291Z","bundle_sha256":"bb69e59421401b227504625e29c744680728cec1accbb9644a1954def5ed5e4f"}}