{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:2ZRWQ5BRD4MJWKYFADQMNXZFXY","short_pith_number":"pith:2ZRWQ5BR","canonical_record":{"source":{"id":"1507.07906","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-07-28T19:22:18Z","cross_cats_sorted":[],"title_canon_sha256":"a5f1be599829b9016695150322eb1e16fa0a05ff630a6c47ccf5eca10822eb1d","abstract_canon_sha256":"cdbf839591e4952a60f150d70c7a7c36d59ab99786b74e613c81544ec30c95bd"},"schema_version":"1.0"},"canonical_sha256":"d6636874311f189b2b0500e0c6df25be38e16335b07579ad657e6507307c46b8","source":{"kind":"arxiv","id":"1507.07906","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.07906","created_at":"2026-05-18T01:36:08Z"},{"alias_kind":"arxiv_version","alias_value":"1507.07906v2","created_at":"2026-05-18T01:36:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.07906","created_at":"2026-05-18T01:36:08Z"},{"alias_kind":"pith_short_12","alias_value":"2ZRWQ5BRD4MJ","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"2ZRWQ5BRD4MJWKYF","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"2ZRWQ5BR","created_at":"2026-05-18T12:29:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:2ZRWQ5BRD4MJWKYFADQMNXZFXY","target":"record","payload":{"canonical_record":{"source":{"id":"1507.07906","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-07-28T19:22:18Z","cross_cats_sorted":[],"title_canon_sha256":"a5f1be599829b9016695150322eb1e16fa0a05ff630a6c47ccf5eca10822eb1d","abstract_canon_sha256":"cdbf839591e4952a60f150d70c7a7c36d59ab99786b74e613c81544ec30c95bd"},"schema_version":"1.0"},"canonical_sha256":"d6636874311f189b2b0500e0c6df25be38e16335b07579ad657e6507307c46b8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:36:08.874630Z","signature_b64":"hlaxqoultsKrpChku22tfZB39+80j7r4+SnKp6z8Q3Zxqksv6jBuNZeXsNj0Z6ZZTU4+mfCtkmvw+xlkrueRCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d6636874311f189b2b0500e0c6df25be38e16335b07579ad657e6507307c46b8","last_reissued_at":"2026-05-18T01:36:08.873998Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:36:08.873998Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1507.07906","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":"2026-05-18T01:36:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LSMK+iVcIhKtlqcg4DxpMy5rxqqMiVoyMQD6IcUbDMS7cvCAmFrfH7Ye6nebIygRKxSUm+DKveuYu9YZ1Yg3BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T16:32:43.054328Z"},"content_sha256":"ce07a0896368f039c9ff47b2327f42f673b6b00aa7f319a20de5ad5ffdcd6c02","schema_version":"1.0","event_id":"sha256:ce07a0896368f039c9ff47b2327f42f673b6b00aa7f319a20de5ad5ffdcd6c02"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:2ZRWQ5BRD4MJWKYFADQMNXZFXY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Sputtering of Oxygen Ice by Low Energy Ions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"A. Fitzsimmons, C. A. Hunniford, E. A. Muntean, P. Lacerda, R. W. McCullough, T. A. Field","submitted_at":"2015-07-28T19:22:18Z","abstract_excerpt":"Naturally occurring ices lie on both interstellar dust grains and on celestial objects, such as those in the outer solar system. These ices are continu- ously subjected to irradiation by ions from the solar wind and/or cosmic rays, which modify their surfaces. As a result, new molecular species may form which can be sputtered off into space or planetary atmospheres. We determined the experimental values of sputtering yields for irradiation of oxygen ice at 10 K by singly (He+, C+, N+, O+ and Ar+) and doubly (C2+, N2+ and O2+) charged ions with 4 keV kinetic energy. In these laboratory experime"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.07906","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":"2026-05-18T01:36:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2EUCQiZs+4HmTAGcQ1pKTcmmkyaQO8FF72wMLw1z3rixkT659V5SBAYdfF0mezIjCSymenYTlYmjX2FAkaeODg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T16:32:43.054705Z"},"content_sha256":"7525a3b33502f65e7f9829d9eb1ff3de1bb8b1e5ec17b770b72a33cf78bc82b5","schema_version":"1.0","event_id":"sha256:7525a3b33502f65e7f9829d9eb1ff3de1bb8b1e5ec17b770b72a33cf78bc82b5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2ZRWQ5BRD4MJWKYFADQMNXZFXY/bundle.json","state_url":"https://pith.science/pith/2ZRWQ5BRD4MJWKYFADQMNXZFXY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2ZRWQ5BRD4MJWKYFADQMNXZFXY/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":"2026-05-28T16:32:43Z","links":{"resolver":"https://pith.science/pith/2ZRWQ5BRD4MJWKYFADQMNXZFXY","bundle":"https://pith.science/pith/2ZRWQ5BRD4MJWKYFADQMNXZFXY/bundle.json","state":"https://pith.science/pith/2ZRWQ5BRD4MJWKYFADQMNXZFXY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2ZRWQ5BRD4MJWKYFADQMNXZFXY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:2ZRWQ5BRD4MJWKYFADQMNXZFXY","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":"cdbf839591e4952a60f150d70c7a7c36d59ab99786b74e613c81544ec30c95bd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-07-28T19:22:18Z","title_canon_sha256":"a5f1be599829b9016695150322eb1e16fa0a05ff630a6c47ccf5eca10822eb1d"},"schema_version":"1.0","source":{"id":"1507.07906","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.07906","created_at":"2026-05-18T01:36:08Z"},{"alias_kind":"arxiv_version","alias_value":"1507.07906v2","created_at":"2026-05-18T01:36:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.07906","created_at":"2026-05-18T01:36:08Z"},{"alias_kind":"pith_short_12","alias_value":"2ZRWQ5BRD4MJ","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"2ZRWQ5BRD4MJWKYF","created_at":"2026-05-18T12:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"2ZRWQ5BR","created_at":"2026-05-18T12:29:02Z"}],"graph_snapshots":[{"event_id":"sha256:7525a3b33502f65e7f9829d9eb1ff3de1bb8b1e5ec17b770b72a33cf78bc82b5","target":"graph","created_at":"2026-05-18T01:36:08Z","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":"Naturally occurring ices lie on both interstellar dust grains and on celestial objects, such as those in the outer solar system. These ices are continu- ously subjected to irradiation by ions from the solar wind and/or cosmic rays, which modify their surfaces. As a result, new molecular species may form which can be sputtered off into space or planetary atmospheres. We determined the experimental values of sputtering yields for irradiation of oxygen ice at 10 K by singly (He+, C+, N+, O+ and Ar+) and doubly (C2+, N2+ and O2+) charged ions with 4 keV kinetic energy. In these laboratory experime","authors_text":"A. Fitzsimmons, C. A. Hunniford, E. A. Muntean, P. Lacerda, R. W. McCullough, T. A. Field","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-07-28T19:22:18Z","title":"Sputtering of Oxygen Ice by Low Energy Ions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.07906","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:ce07a0896368f039c9ff47b2327f42f673b6b00aa7f319a20de5ad5ffdcd6c02","target":"record","created_at":"2026-05-18T01:36:08Z","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":"cdbf839591e4952a60f150d70c7a7c36d59ab99786b74e613c81544ec30c95bd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2015-07-28T19:22:18Z","title_canon_sha256":"a5f1be599829b9016695150322eb1e16fa0a05ff630a6c47ccf5eca10822eb1d"},"schema_version":"1.0","source":{"id":"1507.07906","kind":"arxiv","version":2}},"canonical_sha256":"d6636874311f189b2b0500e0c6df25be38e16335b07579ad657e6507307c46b8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d6636874311f189b2b0500e0c6df25be38e16335b07579ad657e6507307c46b8","first_computed_at":"2026-05-18T01:36:08.873998Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:36:08.873998Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hlaxqoultsKrpChku22tfZB39+80j7r4+SnKp6z8Q3Zxqksv6jBuNZeXsNj0Z6ZZTU4+mfCtkmvw+xlkrueRCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:36:08.874630Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.07906","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce07a0896368f039c9ff47b2327f42f673b6b00aa7f319a20de5ad5ffdcd6c02","sha256:7525a3b33502f65e7f9829d9eb1ff3de1bb8b1e5ec17b770b72a33cf78bc82b5"],"state_sha256":"7f4a92ff91da5b74a8bb40588e4eb06250fa7b5d1cc2a46f5cbcb5556df6317f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X8Ni4dfZfkV21GtPUH8UBvl2PwIVHWNx7miFNykrtixOz6747TqE7Lzh1B2iLM0lU3zS1e3386HLuDRAttpcBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T16:32:43.056715Z","bundle_sha256":"af3350f824d23768d4b0e5a81429569d659cc0ba326a722cbbb245bf18a7f876"}}