{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:SPYPI7NOVDIQUQV4TCM3ODTJOQ","short_pith_number":"pith:SPYPI7NO","canonical_record":{"source":{"id":"1304.1407","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-04T15:46:56Z","cross_cats_sorted":[],"title_canon_sha256":"d767e8e16f0816dc4ca1d68dd7d1bc9e624d47c7cbfcf7b6263d13c9d1b21764","abstract_canon_sha256":"45efd1119f84c1f596f68b34c60477446e6f9221ec4f1f88ceabee2acd37601f"},"schema_version":"1.0"},"canonical_sha256":"93f0f47daea8d10a42bc9899b70e69741705d4103f8d32c9c57bed077617ec08","source":{"kind":"arxiv","id":"1304.1407","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.1407","created_at":"2026-05-18T03:28:56Z"},{"alias_kind":"arxiv_version","alias_value":"1304.1407v1","created_at":"2026-05-18T03:28:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.1407","created_at":"2026-05-18T03:28:56Z"},{"alias_kind":"pith_short_12","alias_value":"SPYPI7NOVDIQ","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_16","alias_value":"SPYPI7NOVDIQUQV4","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_8","alias_value":"SPYPI7NO","created_at":"2026-05-18T12:27:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:SPYPI7NOVDIQUQV4TCM3ODTJOQ","target":"record","payload":{"canonical_record":{"source":{"id":"1304.1407","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-04T15:46:56Z","cross_cats_sorted":[],"title_canon_sha256":"d767e8e16f0816dc4ca1d68dd7d1bc9e624d47c7cbfcf7b6263d13c9d1b21764","abstract_canon_sha256":"45efd1119f84c1f596f68b34c60477446e6f9221ec4f1f88ceabee2acd37601f"},"schema_version":"1.0"},"canonical_sha256":"93f0f47daea8d10a42bc9899b70e69741705d4103f8d32c9c57bed077617ec08","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:28:56.866801Z","signature_b64":"wynYTq+yFCNXHV0YB0wfSwxW8o3YOB9mix2wOLZeVqkHAymIlktIJTUU6vYqSNQ+0zxC5tBd7UnAL0cBLYYfAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"93f0f47daea8d10a42bc9899b70e69741705d4103f8d32c9c57bed077617ec08","last_reissued_at":"2026-05-18T03:28:56.866188Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:28:56.866188Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1304.1407","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":"2026-05-18T03:28:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wXfKolkbx2ClpS/AZG/CIU8J9PSv7XARkP/EvsbUaua8YZ/S6WNcRB+3VjHZQWFQdbMEihRD3q6g6V5fGRl/AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T08:07:03.846888Z"},"content_sha256":"02b6821918072c874f1b0969030a982bfe65d93c968785c4f4c1c17254723426","schema_version":"1.0","event_id":"sha256:02b6821918072c874f1b0969030a982bfe65d93c968785c4f4c1c17254723426"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:SPYPI7NOVDIQUQV4TCM3ODTJOQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Effect of fluorinated diamond surface on charge state of nitrogen-vacancy centers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Evelyn L. Hu, Shanying Cui","submitted_at":"2013-04-04T15:46:56Z","abstract_excerpt":"We investigated the effect of fluorine-terminated diamond surface on the charged state of shallow nitrogen vacancy defect centers (NVs). Fluorination is achieved with CF4 plasma and the surface chemistry is confirmed with x-ray photoemission spectroscopy. Photoluminescence of these ensemble NVs reveal that fluorine-treated surfaces lead to a higher negatively charged nitrogen vacancy (NV-) population than oxygen-terminated surfaces. Using surface chemistry to control NV charges, in particular increasing the density of NV- centers, is an important step towards improving the optical and spin pro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.1407","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":"2026-05-18T03:28:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c/lcRp1f0ptke4DXlV4rRAy1O5HeENWK5Mpw17yzxeSSEj5FgyFw4LrN7iq9ZfzP4w/PRsPf7RFMXDK9ZkaNAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T08:07:03.847542Z"},"content_sha256":"f55726fc4e7e1c637909fd50eaa5c979007e8546997cc9d91c61b2b7d389936c","schema_version":"1.0","event_id":"sha256:f55726fc4e7e1c637909fd50eaa5c979007e8546997cc9d91c61b2b7d389936c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SPYPI7NOVDIQUQV4TCM3ODTJOQ/bundle.json","state_url":"https://pith.science/pith/SPYPI7NOVDIQUQV4TCM3ODTJOQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SPYPI7NOVDIQUQV4TCM3ODTJOQ/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":"2026-06-07T08:07:03Z","links":{"resolver":"https://pith.science/pith/SPYPI7NOVDIQUQV4TCM3ODTJOQ","bundle":"https://pith.science/pith/SPYPI7NOVDIQUQV4TCM3ODTJOQ/bundle.json","state":"https://pith.science/pith/SPYPI7NOVDIQUQV4TCM3ODTJOQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SPYPI7NOVDIQUQV4TCM3ODTJOQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:SPYPI7NOVDIQUQV4TCM3ODTJOQ","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":"45efd1119f84c1f596f68b34c60477446e6f9221ec4f1f88ceabee2acd37601f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-04T15:46:56Z","title_canon_sha256":"d767e8e16f0816dc4ca1d68dd7d1bc9e624d47c7cbfcf7b6263d13c9d1b21764"},"schema_version":"1.0","source":{"id":"1304.1407","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.1407","created_at":"2026-05-18T03:28:56Z"},{"alias_kind":"arxiv_version","alias_value":"1304.1407v1","created_at":"2026-05-18T03:28:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.1407","created_at":"2026-05-18T03:28:56Z"},{"alias_kind":"pith_short_12","alias_value":"SPYPI7NOVDIQ","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_16","alias_value":"SPYPI7NOVDIQUQV4","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_8","alias_value":"SPYPI7NO","created_at":"2026-05-18T12:27:59Z"}],"graph_snapshots":[{"event_id":"sha256:f55726fc4e7e1c637909fd50eaa5c979007e8546997cc9d91c61b2b7d389936c","target":"graph","created_at":"2026-05-18T03:28:56Z","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 investigated the effect of fluorine-terminated diamond surface on the charged state of shallow nitrogen vacancy defect centers (NVs). Fluorination is achieved with CF4 plasma and the surface chemistry is confirmed with x-ray photoemission spectroscopy. Photoluminescence of these ensemble NVs reveal that fluorine-treated surfaces lead to a higher negatively charged nitrogen vacancy (NV-) population than oxygen-terminated surfaces. Using surface chemistry to control NV charges, in particular increasing the density of NV- centers, is an important step towards improving the optical and spin pro","authors_text":"Evelyn L. Hu, Shanying Cui","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-04T15:46:56Z","title":"Effect of fluorinated diamond surface on charge state of nitrogen-vacancy centers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.1407","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":"sha256:02b6821918072c874f1b0969030a982bfe65d93c968785c4f4c1c17254723426","target":"record","created_at":"2026-05-18T03:28:56Z","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":"45efd1119f84c1f596f68b34c60477446e6f9221ec4f1f88ceabee2acd37601f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-04T15:46:56Z","title_canon_sha256":"d767e8e16f0816dc4ca1d68dd7d1bc9e624d47c7cbfcf7b6263d13c9d1b21764"},"schema_version":"1.0","source":{"id":"1304.1407","kind":"arxiv","version":1}},"canonical_sha256":"93f0f47daea8d10a42bc9899b70e69741705d4103f8d32c9c57bed077617ec08","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"93f0f47daea8d10a42bc9899b70e69741705d4103f8d32c9c57bed077617ec08","first_computed_at":"2026-05-18T03:28:56.866188Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:28:56.866188Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wynYTq+yFCNXHV0YB0wfSwxW8o3YOB9mix2wOLZeVqkHAymIlktIJTUU6vYqSNQ+0zxC5tBd7UnAL0cBLYYfAw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:28:56.866801Z","signed_message":"canonical_sha256_bytes"},"source_id":"1304.1407","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:02b6821918072c874f1b0969030a982bfe65d93c968785c4f4c1c17254723426","sha256:f55726fc4e7e1c637909fd50eaa5c979007e8546997cc9d91c61b2b7d389936c"],"state_sha256":"a379c6c6719073a1921b36d8fa334a9ee853b10821c5933a8635e9feb9f57594"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fTTIPRMzjhCfO1YIfZBDip6hgwn+iZi0G8nrvhFvJF5c25tApJP0CkKcyOcnu8NreCN8jGo7AIzM5mIzkDaGAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T08:07:03.851111Z","bundle_sha256":"4324d0dbd75c81e2011787057520d13af76a6494897d8daa41be6a184af54b0f"}}