{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:2ANQGDZPW6G2KJH65AP2I4UV6U","short_pith_number":"pith:2ANQGDZP","canonical_record":{"source":{"id":"1909.03791","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2019-09-09T12:16:20Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"49802ccdb7d2a48fdd55498f288515d4809cf0f664b3c39048b8794424e3eb84","abstract_canon_sha256":"cc5b2cfceb5285284e9b726721ba006a17530a06ecd625cf1d365e3ca137a708"},"schema_version":"1.0"},"canonical_sha256":"d01b030f2fb78da524fee81fa47295f527db8bf7121cd723e5e3b7f73aabfe02","source":{"kind":"arxiv","id":"1909.03791","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.03791","created_at":"2026-07-05T00:34:43Z"},{"alias_kind":"arxiv_version","alias_value":"1909.03791v2","created_at":"2026-07-05T00:34:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.03791","created_at":"2026-07-05T00:34:43Z"},{"alias_kind":"pith_short_12","alias_value":"2ANQGDZPW6G2","created_at":"2026-07-05T00:34:43Z"},{"alias_kind":"pith_short_16","alias_value":"2ANQGDZPW6G2KJH6","created_at":"2026-07-05T00:34:43Z"},{"alias_kind":"pith_short_8","alias_value":"2ANQGDZP","created_at":"2026-07-05T00:34:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:2ANQGDZPW6G2KJH65AP2I4UV6U","target":"record","payload":{"canonical_record":{"source":{"id":"1909.03791","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2019-09-09T12:16:20Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"49802ccdb7d2a48fdd55498f288515d4809cf0f664b3c39048b8794424e3eb84","abstract_canon_sha256":"cc5b2cfceb5285284e9b726721ba006a17530a06ecd625cf1d365e3ca137a708"},"schema_version":"1.0"},"canonical_sha256":"d01b030f2fb78da524fee81fa47295f527db8bf7121cd723e5e3b7f73aabfe02","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:34:43.610718Z","signature_b64":"SGxUZM+ZzJVHez5ro2qbs03PiqFwDD50JO+CzRJhl6Bl7X8T5IV7+KlL8xEmGZX9/XwUBv2pwT7X8gXsVTreAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d01b030f2fb78da524fee81fa47295f527db8bf7121cd723e5e3b7f73aabfe02","last_reissued_at":"2026-07-05T00:34:43.610159Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:34:43.610159Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.03791","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:34:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/5jY5OkpqQqw+5wJJQP8ZQ0BRhP7YR7aoNlzNTcTA2IZIutn270HdbpXoulsWQeXE6cp7h+HWa00k/T2V8/nBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-16T05:00:48.871704Z"},"content_sha256":"3e36550e74a6373f2ad234fb0389b310d0eb2a0efe91897e40d687aea513878c","schema_version":"1.0","event_id":"sha256:3e36550e74a6373f2ad234fb0389b310d0eb2a0efe91897e40d687aea513878c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:2ANQGDZPW6G2KJH65AP2I4UV6U","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Narrow-Band Pulsed Electron Source Based on Near-Threshold Photoionization of Cs in a Magneto-Optical Trap","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"physics.atom-ph","authors_text":"D. Comparat, G. Sch\\\"onhense, O. Fedchenko, R. Hahn, S. Chernov","submitted_at":"2019-09-09T12:16:20Z","abstract_excerpt":"The newly developed method of time-of-flight (ToF) momentum microscopy was used to analyse the cold electron emission from a Cs 3D magneto-optical trap (MOT). Three-step resonant photoionization was implemented via two intermediate states (6P3/2 pumped with 852 nm laser and 7S1/2 with 1470 nm) and a tuneable femtosecond Ti:sapphire laser for the final ionization step. The magnetic field of the MOT is switched off during the photoionization step. The natural bandwidth of the fs-laser is reduced to 4 meV using optical spectral filters. Precise tuning of the photon energy makes it possible to obs"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.03791","kind":"arxiv","version":2},"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/1909.03791/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":"2026-07-05T00:34:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jrXZ+FKyFIrTR9KXlubVcGdE0JIrNpquqCg3I8kzL3KTuAANHpARyk92T6T+7C8eLP0F2QyUV8b/5iFQIGFaAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-16T05:00:48.872083Z"},"content_sha256":"4fad049227c58991862a41f6979a5665447dbeb7c389d3702b7586d5fc4ef0a2","schema_version":"1.0","event_id":"sha256:4fad049227c58991862a41f6979a5665447dbeb7c389d3702b7586d5fc4ef0a2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2ANQGDZPW6G2KJH65AP2I4UV6U/bundle.json","state_url":"https://pith.science/pith/2ANQGDZPW6G2KJH65AP2I4UV6U/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2ANQGDZPW6G2KJH65AP2I4UV6U/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":"2026-07-16T05:00:48Z","links":{"resolver":"https://pith.science/pith/2ANQGDZPW6G2KJH65AP2I4UV6U","bundle":"https://pith.science/pith/2ANQGDZPW6G2KJH65AP2I4UV6U/bundle.json","state":"https://pith.science/pith/2ANQGDZPW6G2KJH65AP2I4UV6U/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2ANQGDZPW6G2KJH65AP2I4UV6U/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:2ANQGDZPW6G2KJH65AP2I4UV6U","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":"cc5b2cfceb5285284e9b726721ba006a17530a06ecd625cf1d365e3ca137a708","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2019-09-09T12:16:20Z","title_canon_sha256":"49802ccdb7d2a48fdd55498f288515d4809cf0f664b3c39048b8794424e3eb84"},"schema_version":"1.0","source":{"id":"1909.03791","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.03791","created_at":"2026-07-05T00:34:43Z"},{"alias_kind":"arxiv_version","alias_value":"1909.03791v2","created_at":"2026-07-05T00:34:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.03791","created_at":"2026-07-05T00:34:43Z"},{"alias_kind":"pith_short_12","alias_value":"2ANQGDZPW6G2","created_at":"2026-07-05T00:34:43Z"},{"alias_kind":"pith_short_16","alias_value":"2ANQGDZPW6G2KJH6","created_at":"2026-07-05T00:34:43Z"},{"alias_kind":"pith_short_8","alias_value":"2ANQGDZP","created_at":"2026-07-05T00:34:43Z"}],"graph_snapshots":[{"event_id":"sha256:4fad049227c58991862a41f6979a5665447dbeb7c389d3702b7586d5fc4ef0a2","target":"graph","created_at":"2026-07-05T00:34:43Z","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/1909.03791/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The newly developed method of time-of-flight (ToF) momentum microscopy was used to analyse the cold electron emission from a Cs 3D magneto-optical trap (MOT). Three-step resonant photoionization was implemented via two intermediate states (6P3/2 pumped with 852 nm laser and 7S1/2 with 1470 nm) and a tuneable femtosecond Ti:sapphire laser for the final ionization step. The magnetic field of the MOT is switched off during the photoionization step. The natural bandwidth of the fs-laser is reduced to 4 meV using optical spectral filters. Precise tuning of the photon energy makes it possible to obs","authors_text":"D. Comparat, G. Sch\\\"onhense, O. Fedchenko, R. Hahn, S. Chernov","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2019-09-09T12:16:20Z","title":"Narrow-Band Pulsed Electron Source Based on Near-Threshold Photoionization of Cs in a Magneto-Optical Trap"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.03791","kind":"arxiv","version":2},"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":"sha256:3e36550e74a6373f2ad234fb0389b310d0eb2a0efe91897e40d687aea513878c","target":"record","created_at":"2026-07-05T00:34:43Z","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":"cc5b2cfceb5285284e9b726721ba006a17530a06ecd625cf1d365e3ca137a708","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2019-09-09T12:16:20Z","title_canon_sha256":"49802ccdb7d2a48fdd55498f288515d4809cf0f664b3c39048b8794424e3eb84"},"schema_version":"1.0","source":{"id":"1909.03791","kind":"arxiv","version":2}},"canonical_sha256":"d01b030f2fb78da524fee81fa47295f527db8bf7121cd723e5e3b7f73aabfe02","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d01b030f2fb78da524fee81fa47295f527db8bf7121cd723e5e3b7f73aabfe02","first_computed_at":"2026-07-05T00:34:43.610159Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:34:43.610159Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SGxUZM+ZzJVHez5ro2qbs03PiqFwDD50JO+CzRJhl6Bl7X8T5IV7+KlL8xEmGZX9/XwUBv2pwT7X8gXsVTreAg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:34:43.610718Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.03791","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3e36550e74a6373f2ad234fb0389b310d0eb2a0efe91897e40d687aea513878c","sha256:4fad049227c58991862a41f6979a5665447dbeb7c389d3702b7586d5fc4ef0a2"],"state_sha256":"09db4b181f9fe992eaf7c00ca621642ce8507b6cc281228ab8dd9a857b15b516"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Xf2b9+lmEf5SpEpOXfyQb/xpttgcGuItkiL9npt+KZ7Xa26rgxR6AQSrelardUIF8w575Pf8tt3Od0W0KljBCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-16T05:00:48.874365Z","bundle_sha256":"cc16214b36cd4604ebe37506f0ae112cb29214848889b861d23e0f4220c4c9ce"}}