{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:OC7TPEJV45ZGQ2R35DJG5QGNQO","short_pith_number":"pith:OC7TPEJV","canonical_record":{"source":{"id":"1109.2872","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-09-13T18:10:05Z","cross_cats_sorted":[],"title_canon_sha256":"6e9d13221d971619f5ca96d5f9e4df1b0420d15390910741b06064865dd0e56e","abstract_canon_sha256":"07351bf6c0d9f94846ba2c3fbc252e6c9a751754380f8b5552d9345a430c5e16"},"schema_version":"1.0"},"canonical_sha256":"70bf379135e772686a3be8d26ec0cd83b387bfdcf07c85f3a80d3420ab8f4cf3","source":{"kind":"arxiv","id":"1109.2872","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.2872","created_at":"2026-05-18T04:13:07Z"},{"alias_kind":"arxiv_version","alias_value":"1109.2872v1","created_at":"2026-05-18T04:13:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.2872","created_at":"2026-05-18T04:13:07Z"},{"alias_kind":"pith_short_12","alias_value":"OC7TPEJV45ZG","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_16","alias_value":"OC7TPEJV45ZGQ2R3","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_8","alias_value":"OC7TPEJV","created_at":"2026-05-18T12:26:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:OC7TPEJV45ZGQ2R35DJG5QGNQO","target":"record","payload":{"canonical_record":{"source":{"id":"1109.2872","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-09-13T18:10:05Z","cross_cats_sorted":[],"title_canon_sha256":"6e9d13221d971619f5ca96d5f9e4df1b0420d15390910741b06064865dd0e56e","abstract_canon_sha256":"07351bf6c0d9f94846ba2c3fbc252e6c9a751754380f8b5552d9345a430c5e16"},"schema_version":"1.0"},"canonical_sha256":"70bf379135e772686a3be8d26ec0cd83b387bfdcf07c85f3a80d3420ab8f4cf3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:13:07.530807Z","signature_b64":"R2x5PXJeBvnu4qpdgFZzeCX4AYiZlk74WOZGSi/SFfxb+tcxzgVc03OV2yWNwCub7k79wphw2p6i9DjnCd42Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"70bf379135e772686a3be8d26ec0cd83b387bfdcf07c85f3a80d3420ab8f4cf3","last_reissued_at":"2026-05-18T04:13:07.530140Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:13:07.530140Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1109.2872","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":"2026-05-18T04:13:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Bim6vfDYZWURt/4XZjjSAGoYcxSjZPQVKVEmXCkaqVgoWFbk1XvYSUelCF/QAMyqBTgfcVxKHwahZAyxoXpcBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T17:30:45.514372Z"},"content_sha256":"cf38c5b1ee88e6363e247675cf2cd233c6da264305d36c97c5ca3885efa8878e","schema_version":"1.0","event_id":"sha256:cf38c5b1ee88e6363e247675cf2cd233c6da264305d36c97c5ca3885efa8878e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:OC7TPEJV45ZGQ2R35DJG5QGNQO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A new thin film photochromic material: Oxygen-containing yttrium hydride","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Bernard Dam, Bj{\\o}rn C. Hauback, Charlotte Platzer-Bj\\\"orkman, Erik S. Marstein, Jan Petter Maehlen, Lennard P. A. Mooij, Smagul Karazhanov, Trygve Mongstad, Yevheniy Pivak","submitted_at":"2011-09-13T18:10:05Z","abstract_excerpt":"In this work we report on photochromism in transparent thin film samples of oxygen-containing yttrium hydride. Exposure to visible and ultraviolet (UV) light at moderate intensity triggers a decrease in the optical transmission of visible and infrared (IR) light. The photo-darkening is colour-neutral. We show that the optical transmission of samples of 500 nm thickness can be reduced by up to 50% after one hour of illumination with light of moderate intensity. The reaction is reversible and samples that are left in the dark return to the initial transparent state. The relaxation time in the da"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.2872","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":"2026-05-18T04:13:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eAwYVyMUco9MYqj98dQuGRjEjw0R0smSsyirhkOYMGh3NI03Z5kSu9jrkr0kpewtQo/rATxnbujUVnZ26104AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T17:30:45.514965Z"},"content_sha256":"710fc5c382d8f9563856067110f86c68f7fa617c9d29be8ed04956d4281c56fa","schema_version":"1.0","event_id":"sha256:710fc5c382d8f9563856067110f86c68f7fa617c9d29be8ed04956d4281c56fa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OC7TPEJV45ZGQ2R35DJG5QGNQO/bundle.json","state_url":"https://pith.science/pith/OC7TPEJV45ZGQ2R35DJG5QGNQO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OC7TPEJV45ZGQ2R35DJG5QGNQO/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":"2026-06-04T17:30:45Z","links":{"resolver":"https://pith.science/pith/OC7TPEJV45ZGQ2R35DJG5QGNQO","bundle":"https://pith.science/pith/OC7TPEJV45ZGQ2R35DJG5QGNQO/bundle.json","state":"https://pith.science/pith/OC7TPEJV45ZGQ2R35DJG5QGNQO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OC7TPEJV45ZGQ2R35DJG5QGNQO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:OC7TPEJV45ZGQ2R35DJG5QGNQO","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":"07351bf6c0d9f94846ba2c3fbc252e6c9a751754380f8b5552d9345a430c5e16","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-09-13T18:10:05Z","title_canon_sha256":"6e9d13221d971619f5ca96d5f9e4df1b0420d15390910741b06064865dd0e56e"},"schema_version":"1.0","source":{"id":"1109.2872","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.2872","created_at":"2026-05-18T04:13:07Z"},{"alias_kind":"arxiv_version","alias_value":"1109.2872v1","created_at":"2026-05-18T04:13:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.2872","created_at":"2026-05-18T04:13:07Z"},{"alias_kind":"pith_short_12","alias_value":"OC7TPEJV45ZG","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_16","alias_value":"OC7TPEJV45ZGQ2R3","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_8","alias_value":"OC7TPEJV","created_at":"2026-05-18T12:26:37Z"}],"graph_snapshots":[{"event_id":"sha256:710fc5c382d8f9563856067110f86c68f7fa617c9d29be8ed04956d4281c56fa","target":"graph","created_at":"2026-05-18T04:13:07Z","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":"In this work we report on photochromism in transparent thin film samples of oxygen-containing yttrium hydride. Exposure to visible and ultraviolet (UV) light at moderate intensity triggers a decrease in the optical transmission of visible and infrared (IR) light. The photo-darkening is colour-neutral. We show that the optical transmission of samples of 500 nm thickness can be reduced by up to 50% after one hour of illumination with light of moderate intensity. The reaction is reversible and samples that are left in the dark return to the initial transparent state. The relaxation time in the da","authors_text":"Bernard Dam, Bj{\\o}rn C. Hauback, Charlotte Platzer-Bj\\\"orkman, Erik S. Marstein, Jan Petter Maehlen, Lennard P. A. Mooij, Smagul Karazhanov, Trygve Mongstad, Yevheniy Pivak","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-09-13T18:10:05Z","title":"A new thin film photochromic material: Oxygen-containing yttrium hydride"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.2872","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:cf38c5b1ee88e6363e247675cf2cd233c6da264305d36c97c5ca3885efa8878e","target":"record","created_at":"2026-05-18T04:13:07Z","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":"07351bf6c0d9f94846ba2c3fbc252e6c9a751754380f8b5552d9345a430c5e16","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-09-13T18:10:05Z","title_canon_sha256":"6e9d13221d971619f5ca96d5f9e4df1b0420d15390910741b06064865dd0e56e"},"schema_version":"1.0","source":{"id":"1109.2872","kind":"arxiv","version":1}},"canonical_sha256":"70bf379135e772686a3be8d26ec0cd83b387bfdcf07c85f3a80d3420ab8f4cf3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"70bf379135e772686a3be8d26ec0cd83b387bfdcf07c85f3a80d3420ab8f4cf3","first_computed_at":"2026-05-18T04:13:07.530140Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:13:07.530140Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"R2x5PXJeBvnu4qpdgFZzeCX4AYiZlk74WOZGSi/SFfxb+tcxzgVc03OV2yWNwCub7k79wphw2p6i9DjnCd42Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:13:07.530807Z","signed_message":"canonical_sha256_bytes"},"source_id":"1109.2872","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cf38c5b1ee88e6363e247675cf2cd233c6da264305d36c97c5ca3885efa8878e","sha256:710fc5c382d8f9563856067110f86c68f7fa617c9d29be8ed04956d4281c56fa"],"state_sha256":"34732a178152286ae711ad07061592d787d40922e52004dafc44480b3626dc88"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Q7Nh1KdZOX6snzT2EF6GxxA5kKHrktQUJegmECfcyjsPGhpR23TdbSXx1GX8p+UjTReRKBwpPcoOS3Vc3/uDDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T17:30:45.518088Z","bundle_sha256":"1d83893af633dc6fa8531e920dcb82345fc76e53b4421b0872161215e75242d0"}}