{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:IPXSDV2POISAFFG7XQTWJAJG5M","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":"bdd747845d00c39bdc9931929316c96cb6e0d1a823f91c5fbb306e4dc5d9dfc5","cross_cats_sorted":["physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2018-01-31T18:12:58Z","title_canon_sha256":"3a3622f8f3d387c6818ec52fef67a45b25dcfdab638cc17000da1b78f2947e0d"},"schema_version":"1.0","source":{"id":"1801.10586","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.10586","created_at":"2026-05-18T00:20:02Z"},{"alias_kind":"arxiv_version","alias_value":"1801.10586v2","created_at":"2026-05-18T00:20:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.10586","created_at":"2026-05-18T00:20:02Z"},{"alias_kind":"pith_short_12","alias_value":"IPXSDV2POISA","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"IPXSDV2POISAFFG7","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"IPXSDV2P","created_at":"2026-05-18T12:32:31Z"}],"graph_snapshots":[{"event_id":"sha256:d52d27062e2e8934c8271a7e5f6e50dbc9c479014c62b00a9af67cf25a764e05","target":"graph","created_at":"2026-05-18T00:20:02Z","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":"We have designed, constructed, and commissioned a cryogenic helium buffer-gas source for producing a cryogenially-cooled molecular beam and evaluated the effect of different cell geometries on the intensity of the produced molecular beam, using ammonia as a test molecule. Planar and conical entrance and exit geometries are tested. We observe a three fold enhancement in the NH$_3$ signal for a cell with planar-entrance and conical-exit geometry, compared to that for a typically used `box'-like geometry with planar entrance and exit. These observations are rationalized by flow-field simulations ","authors_text":"Amit K. Samanta, Daniel A. Horke, Daniel Gusa, Igor Rubinsky, Jochen K\\\"upper, Nils Roth, Tim Ossenbr\\\"uggen, Vijay Singh","cross_cats":["physics.flu-dyn"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2018-01-31T18:12:58Z","title":"Optimized cell geometry for buffer-gas-cooled molecular-beam sources"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.10586","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:c2360b507d00cb85aabd5a0d06c3b01810e755f500f3bc37734fbf1be355cfb0","target":"record","created_at":"2026-05-18T00:20:02Z","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":"bdd747845d00c39bdc9931929316c96cb6e0d1a823f91c5fbb306e4dc5d9dfc5","cross_cats_sorted":["physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2018-01-31T18:12:58Z","title_canon_sha256":"3a3622f8f3d387c6818ec52fef67a45b25dcfdab638cc17000da1b78f2947e0d"},"schema_version":"1.0","source":{"id":"1801.10586","kind":"arxiv","version":2}},"canonical_sha256":"43ef21d74f72240294dfbc27648126eb32ee31fbfed3bcd171b3e84fbd2cb0e1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"43ef21d74f72240294dfbc27648126eb32ee31fbfed3bcd171b3e84fbd2cb0e1","first_computed_at":"2026-05-18T00:20:02.388432Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:20:02.388432Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"keDEy1wuBlAp5iAr1CmyrGhZ3kctNwgOjP1K7Sbuk1GYByC0YlalsSzfyxTBpuAiahCnLYhfjuAKOy+IOEj2BA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:20:02.389082Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.10586","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c2360b507d00cb85aabd5a0d06c3b01810e755f500f3bc37734fbf1be355cfb0","sha256:d52d27062e2e8934c8271a7e5f6e50dbc9c479014c62b00a9af67cf25a764e05"],"state_sha256":"fe73cba1a29715a807619890a45cbb718d6e8de62c834b79336f4289808b774c"}