{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:UHJMZHHGB5T64HWOGQ3AABMHRL","short_pith_number":"pith:UHJMZHHG","canonical_record":{"source":{"id":"1802.07111","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-02-20T13:50:30Z","cross_cats_sorted":["physics.atom-ph"],"title_canon_sha256":"0c5842d61fc905b7ed73532b32f3e94c384600dda99b350a4b94e51d3fe60772","abstract_canon_sha256":"c58533ab2872a35335e121cb1236c1930229e03f053eb0a2eef2c4ef91e65d14"},"schema_version":"1.0"},"canonical_sha256":"a1d2cc9ce60f67ee1ece34360005878ae8c5f1febe04f1943fdd632045318866","source":{"kind":"arxiv","id":"1802.07111","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07111","created_at":"2026-05-18T00:16:50Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07111v2","created_at":"2026-05-18T00:16:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07111","created_at":"2026-05-18T00:16:50Z"},{"alias_kind":"pith_short_12","alias_value":"UHJMZHHGB5T6","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"UHJMZHHGB5T64HWO","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"UHJMZHHG","created_at":"2026-05-18T12:32:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:UHJMZHHGB5T64HWOGQ3AABMHRL","target":"record","payload":{"canonical_record":{"source":{"id":"1802.07111","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-02-20T13:50:30Z","cross_cats_sorted":["physics.atom-ph"],"title_canon_sha256":"0c5842d61fc905b7ed73532b32f3e94c384600dda99b350a4b94e51d3fe60772","abstract_canon_sha256":"c58533ab2872a35335e121cb1236c1930229e03f053eb0a2eef2c4ef91e65d14"},"schema_version":"1.0"},"canonical_sha256":"a1d2cc9ce60f67ee1ece34360005878ae8c5f1febe04f1943fdd632045318866","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:16:50.137328Z","signature_b64":"xvcDNXd/tmf8SziN8S2SoI8A8XW8KVuCviGjfaoIt9EM4p8Uuf5KV5bpvjhUXFNMUGKNHEwiJsPxptAezvsiBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a1d2cc9ce60f67ee1ece34360005878ae8c5f1febe04f1943fdd632045318866","last_reissued_at":"2026-05-18T00:16:50.136761Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:16:50.136761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.07111","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":"2026-05-18T00:16:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1+0i6CVdYQtNkLB7Wdk4XBaPopUSUfNRMMLlqEDqJIoK+EEotoFU8GnHZfXXYMGKqd5DTf7oQQ4AhIloO/JvBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T02:08:03.333113Z"},"content_sha256":"2c7e8488942c437d5e802927746bca7ab27e3cdd4a07d891de7828fe0d806d85","schema_version":"1.0","event_id":"sha256:2c7e8488942c437d5e802927746bca7ab27e3cdd4a07d891de7828fe0d806d85"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:UHJMZHHGB5T64HWOGQ3AABMHRL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measurement of electron-calcium ionization integral cross section using an ion trap with a low-energy, pulsed electron gun","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph"],"primary_cat":"physics.ins-det","authors_text":"Daniel Lisak, {\\L}ukasz K{\\l}osowski, Mariusz Piwi\\'nski, Szymon W\\'ojtewicz","submitted_at":"2018-02-20T13:50:30Z","abstract_excerpt":"An apparatus for production of various atomic and molecular ions inside a linear Paul trap has been set up. The system applies a custom-made, low energy, pulsed electron gun to produce ions in electron impact process. Such ionization method can find some interesting possible applications such as derivation of ions inaccessible other-ways, which can be used in molecular ion experiments. The technique allows also for determination of cross sections for various collisional processes.\n  As a feasibility study, the apparatus was used for determination of ionization integral cross section of calcium"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07111","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":""},"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":"2026-05-18T00:16:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"giEDalz7QZrMLvHYb/Kbwy0lpCaTZ3vOPecKkFTlxQIrmkir6pmuRubi+g5rXtObmXALs0NRmXI2j04WaQEjCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T02:08:03.333505Z"},"content_sha256":"3335605d97b8b1237fe9a5c6d12f9366188fd1757aca319cef28fd638bbe6e07","schema_version":"1.0","event_id":"sha256:3335605d97b8b1237fe9a5c6d12f9366188fd1757aca319cef28fd638bbe6e07"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UHJMZHHGB5T64HWOGQ3AABMHRL/bundle.json","state_url":"https://pith.science/pith/UHJMZHHGB5T64HWOGQ3AABMHRL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UHJMZHHGB5T64HWOGQ3AABMHRL/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":"2026-06-29T02:08:03Z","links":{"resolver":"https://pith.science/pith/UHJMZHHGB5T64HWOGQ3AABMHRL","bundle":"https://pith.science/pith/UHJMZHHGB5T64HWOGQ3AABMHRL/bundle.json","state":"https://pith.science/pith/UHJMZHHGB5T64HWOGQ3AABMHRL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UHJMZHHGB5T64HWOGQ3AABMHRL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:UHJMZHHGB5T64HWOGQ3AABMHRL","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":"c58533ab2872a35335e121cb1236c1930229e03f053eb0a2eef2c4ef91e65d14","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-02-20T13:50:30Z","title_canon_sha256":"0c5842d61fc905b7ed73532b32f3e94c384600dda99b350a4b94e51d3fe60772"},"schema_version":"1.0","source":{"id":"1802.07111","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07111","created_at":"2026-05-18T00:16:50Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07111v2","created_at":"2026-05-18T00:16:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07111","created_at":"2026-05-18T00:16:50Z"},{"alias_kind":"pith_short_12","alias_value":"UHJMZHHGB5T6","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"UHJMZHHGB5T64HWO","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"UHJMZHHG","created_at":"2026-05-18T12:32:56Z"}],"graph_snapshots":[{"event_id":"sha256:3335605d97b8b1237fe9a5c6d12f9366188fd1757aca319cef28fd638bbe6e07","target":"graph","created_at":"2026-05-18T00:16:50Z","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":"An apparatus for production of various atomic and molecular ions inside a linear Paul trap has been set up. The system applies a custom-made, low energy, pulsed electron gun to produce ions in electron impact process. Such ionization method can find some interesting possible applications such as derivation of ions inaccessible other-ways, which can be used in molecular ion experiments. The technique allows also for determination of cross sections for various collisional processes.\n  As a feasibility study, the apparatus was used for determination of ionization integral cross section of calcium","authors_text":"Daniel Lisak, {\\L}ukasz K{\\l}osowski, Mariusz Piwi\\'nski, Szymon W\\'ojtewicz","cross_cats":["physics.atom-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-02-20T13:50:30Z","title":"Measurement of electron-calcium ionization integral cross section using an ion trap with a low-energy, pulsed electron gun"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07111","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":"sha256:2c7e8488942c437d5e802927746bca7ab27e3cdd4a07d891de7828fe0d806d85","target":"record","created_at":"2026-05-18T00:16:50Z","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":"c58533ab2872a35335e121cb1236c1930229e03f053eb0a2eef2c4ef91e65d14","cross_cats_sorted":["physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2018-02-20T13:50:30Z","title_canon_sha256":"0c5842d61fc905b7ed73532b32f3e94c384600dda99b350a4b94e51d3fe60772"},"schema_version":"1.0","source":{"id":"1802.07111","kind":"arxiv","version":2}},"canonical_sha256":"a1d2cc9ce60f67ee1ece34360005878ae8c5f1febe04f1943fdd632045318866","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a1d2cc9ce60f67ee1ece34360005878ae8c5f1febe04f1943fdd632045318866","first_computed_at":"2026-05-18T00:16:50.136761Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:16:50.136761Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xvcDNXd/tmf8SziN8S2SoI8A8XW8KVuCviGjfaoIt9EM4p8Uuf5KV5bpvjhUXFNMUGKNHEwiJsPxptAezvsiBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:16:50.137328Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.07111","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2c7e8488942c437d5e802927746bca7ab27e3cdd4a07d891de7828fe0d806d85","sha256:3335605d97b8b1237fe9a5c6d12f9366188fd1757aca319cef28fd638bbe6e07"],"state_sha256":"d88463a83750e76a3793607de42eb36d8263befc38515424bc7eca5c9f8c7e6a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c6AXeE/xsXCbhUnAIy0Mz86UM50K614sVXY1PejvXIobt4Mz5ttP6B/tmjQnrRwCQNre3N8Yq1Kuq8l/RNBBCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-29T02:08:03.336678Z","bundle_sha256":"a7227dde2864bde65d88edb325630256d501d82fa68bf8e2a6e1cb29aa574a11"}}