{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:46Z3JB6J5F77AFLGAPWIZGXJOO","short_pith_number":"pith:46Z3JB6J","canonical_record":{"source":{"id":"1107.4888","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-07-25T10:44:14Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"3df8b739d4e938eddd25a525434add4bfe7669c5fbb906bef5023b7a545e324b","abstract_canon_sha256":"2f0a9e8034229bc61d92b4aa2ba43d836059ed022f302ecef4b68acf8d4c7a5e"},"schema_version":"1.0"},"canonical_sha256":"e7b3b487c9e97ff0156603ec8c9ae9738829b94b906a391b5219603ea720d2eb","source":{"kind":"arxiv","id":"1107.4888","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.4888","created_at":"2026-05-18T02:21:42Z"},{"alias_kind":"arxiv_version","alias_value":"1107.4888v3","created_at":"2026-05-18T02:21:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.4888","created_at":"2026-05-18T02:21:42Z"},{"alias_kind":"pith_short_12","alias_value":"46Z3JB6J5F77","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"46Z3JB6J5F77AFLG","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"46Z3JB6J","created_at":"2026-05-18T12:26:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:46Z3JB6J5F77AFLGAPWIZGXJOO","target":"record","payload":{"canonical_record":{"source":{"id":"1107.4888","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-07-25T10:44:14Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"3df8b739d4e938eddd25a525434add4bfe7669c5fbb906bef5023b7a545e324b","abstract_canon_sha256":"2f0a9e8034229bc61d92b4aa2ba43d836059ed022f302ecef4b68acf8d4c7a5e"},"schema_version":"1.0"},"canonical_sha256":"e7b3b487c9e97ff0156603ec8c9ae9738829b94b906a391b5219603ea720d2eb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:21:42.659698Z","signature_b64":"seuO5NoUSrDieT8AJqNrxP1D7iFVw+XshHkAZQFjYiHNzx0wn2x0Mc38bTQcBKit9m956EnA3IaAkQ1sUR4oCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e7b3b487c9e97ff0156603ec8c9ae9738829b94b906a391b5219603ea720d2eb","last_reissued_at":"2026-05-18T02:21:42.659252Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:21:42.659252Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1107.4888","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:21:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8Ik59YKiqtQ2QsiGnSVCX0FCwwYeBbvPaVIae3/j4XaKsOIK10aAxu5/8i1KxweFLdZxpjv7mPxSDpXU8bU8DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T13:45:23.928559Z"},"content_sha256":"73bdfde29058e1688fda5dc30d70497715c0673ef124073741780fb0bfd63820","schema_version":"1.0","event_id":"sha256:73bdfde29058e1688fda5dc30d70497715c0673ef124073741780fb0bfd63820"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:46Z3JB6J5F77AFLGAPWIZGXJOO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Impurity-trapped excitons and electron traps in CaF$_2$:Yb$^{2+}$ and SrF$_2$:Yb$^{2+}$ probed by transient photoluminescence enhancement","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"A. Meijerink, G. Berden, J. P. R. Wells, M. F. Reid, P. S. Senanayake, R. J. Reeves","submitted_at":"2011-07-25T10:44:14Z","abstract_excerpt":"CaF$_2$:Yb$^{2+}$ and SrF$_2$:Yb$^{2+}$ crystals have been investigated by a two-color UV + IR transient photoluminescence enhancement technique. The enhancement gives information about both changes in internal energy levels of the excitons and liberation of electrons from traps in the crystals."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.4888","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:21:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CRjH8l93t32jKNAEu6uyS4Fk44oEZYPFAnhM5mDKYQz1c9iS2H6/RH/F7RyGBNvwn+ysKWz/ENrhqEwzsQj8Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T13:45:23.928932Z"},"content_sha256":"30a78692dc28a7c0ab68cbdc5ba54021ec013ac93b5865232e15cc451dbff0fd","schema_version":"1.0","event_id":"sha256:30a78692dc28a7c0ab68cbdc5ba54021ec013ac93b5865232e15cc451dbff0fd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/46Z3JB6J5F77AFLGAPWIZGXJOO/bundle.json","state_url":"https://pith.science/pith/46Z3JB6J5F77AFLGAPWIZGXJOO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/46Z3JB6J5F77AFLGAPWIZGXJOO/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":"2026-06-04T13:45:23Z","links":{"resolver":"https://pith.science/pith/46Z3JB6J5F77AFLGAPWIZGXJOO","bundle":"https://pith.science/pith/46Z3JB6J5F77AFLGAPWIZGXJOO/bundle.json","state":"https://pith.science/pith/46Z3JB6J5F77AFLGAPWIZGXJOO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/46Z3JB6J5F77AFLGAPWIZGXJOO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:46Z3JB6J5F77AFLGAPWIZGXJOO","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":"2f0a9e8034229bc61d92b4aa2ba43d836059ed022f302ecef4b68acf8d4c7a5e","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-07-25T10:44:14Z","title_canon_sha256":"3df8b739d4e938eddd25a525434add4bfe7669c5fbb906bef5023b7a545e324b"},"schema_version":"1.0","source":{"id":"1107.4888","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.4888","created_at":"2026-05-18T02:21:42Z"},{"alias_kind":"arxiv_version","alias_value":"1107.4888v3","created_at":"2026-05-18T02:21:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.4888","created_at":"2026-05-18T02:21:42Z"},{"alias_kind":"pith_short_12","alias_value":"46Z3JB6J5F77","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_16","alias_value":"46Z3JB6J5F77AFLG","created_at":"2026-05-18T12:26:20Z"},{"alias_kind":"pith_short_8","alias_value":"46Z3JB6J","created_at":"2026-05-18T12:26:20Z"}],"graph_snapshots":[{"event_id":"sha256:30a78692dc28a7c0ab68cbdc5ba54021ec013ac93b5865232e15cc451dbff0fd","target":"graph","created_at":"2026-05-18T02:21:42Z","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":"CaF$_2$:Yb$^{2+}$ and SrF$_2$:Yb$^{2+}$ crystals have been investigated by a two-color UV + IR transient photoluminescence enhancement technique. The enhancement gives information about both changes in internal energy levels of the excitons and liberation of electrons from traps in the crystals.","authors_text":"A. Meijerink, G. Berden, J. P. R. Wells, M. F. Reid, P. S. Senanayake, R. J. Reeves","cross_cats":["physics.chem-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-07-25T10:44:14Z","title":"Impurity-trapped excitons and electron traps in CaF$_2$:Yb$^{2+}$ and SrF$_2$:Yb$^{2+}$ probed by transient photoluminescence enhancement"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.4888","kind":"arxiv","version":3},"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":"sha256:73bdfde29058e1688fda5dc30d70497715c0673ef124073741780fb0bfd63820","target":"record","created_at":"2026-05-18T02:21:42Z","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":"2f0a9e8034229bc61d92b4aa2ba43d836059ed022f302ecef4b68acf8d4c7a5e","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-07-25T10:44:14Z","title_canon_sha256":"3df8b739d4e938eddd25a525434add4bfe7669c5fbb906bef5023b7a545e324b"},"schema_version":"1.0","source":{"id":"1107.4888","kind":"arxiv","version":3}},"canonical_sha256":"e7b3b487c9e97ff0156603ec8c9ae9738829b94b906a391b5219603ea720d2eb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e7b3b487c9e97ff0156603ec8c9ae9738829b94b906a391b5219603ea720d2eb","first_computed_at":"2026-05-18T02:21:42.659252Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:21:42.659252Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"seuO5NoUSrDieT8AJqNrxP1D7iFVw+XshHkAZQFjYiHNzx0wn2x0Mc38bTQcBKit9m956EnA3IaAkQ1sUR4oCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:21:42.659698Z","signed_message":"canonical_sha256_bytes"},"source_id":"1107.4888","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:73bdfde29058e1688fda5dc30d70497715c0673ef124073741780fb0bfd63820","sha256:30a78692dc28a7c0ab68cbdc5ba54021ec013ac93b5865232e15cc451dbff0fd"],"state_sha256":"9ec0aff636cedddd64691970ed3ee222e00d5f310974b0966741fa0bf44a4efd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GbPS18iixsFcWCFr8aL7/KUPLMjIuf2SJZBSCCK6ToK7O8OOuyY1pfeTo5d9M6Mg0O4lDfOd8Ti+fbJcx4YHDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T13:45:23.930901Z","bundle_sha256":"d0421b268cf3040f26f4445e5dedbca62d32e2833aa0ad3ab923120ab5cbcb34"}}