{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:XYYVD3DHMIY6D6AL4FAUABWVBA","short_pith_number":"pith:XYYVD3DH","schema_version":"1.0","canonical_sha256":"be3151ec676231e1f80be1414006d50830f5abc15ebfdf58728a8a52d9f335df","source":{"kind":"arxiv","id":"1904.09581","version":1},"attestation_state":"computed","paper":{"title":"First astrophysical detection of the helium hydride ion (HeH$^+$)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"Bernd Klein, Christophe Risacher, David Neufeld, Helmut Wiesemeyer, J\\\"urgen Stutzki, Karl Jacobs, Karl M. Menten, Oliver Ricken, Rolf G\\\"usten, Urs U. Graf","submitted_at":"2019-04-21T11:50:31Z","abstract_excerpt":"During the dawn of chemistry when the temperature of the young Universe had fallen below $\\sim$4000 K, the ions of the light elements produced in Big Bang nucleosynthesis recombined in reverse order of their ionization potential. With its higher ionization potentials, He$^{++}$ (54.5 eV) and He$^+$ (24.6 eV) combined first with free electrons to form the first neutral atom, prior to the recombination of hydrogen (13.6 eV). At that time, in this metal-free and low-density environment, neutral helium atoms formed the Universe's first molecular bond in the helium hydride ion HeH$^+$, by radiative"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1904.09581","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-04-21T11:50:31Z","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"title_canon_sha256":"a3dc82756fb2cdb57f7265e7340aac24385f9167e103650c4beef358c49ee2dd","abstract_canon_sha256":"f22476bc681684c11c38fc2f7da299e7bab610b789e93497fd14a8872b54f1b6"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:43:02.479750Z","signature_b64":"ciZOi3+ReVzVAmXX2k8A9ipWHcJnqTXjDgCjOhtRdZZDXNCliPD+gn/883r6oF7c5evHqhVoych2M6Vw93WrBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"be3151ec676231e1f80be1414006d50830f5abc15ebfdf58728a8a52d9f335df","last_reissued_at":"2026-05-17T23:43:02.479205Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:43:02.479205Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"First astrophysical detection of the helium hydride ion (HeH$^+$)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"Bernd Klein, Christophe Risacher, David Neufeld, Helmut Wiesemeyer, J\\\"urgen Stutzki, Karl Jacobs, Karl M. Menten, Oliver Ricken, Rolf G\\\"usten, Urs U. Graf","submitted_at":"2019-04-21T11:50:31Z","abstract_excerpt":"During the dawn of chemistry when the temperature of the young Universe had fallen below $\\sim$4000 K, the ions of the light elements produced in Big Bang nucleosynthesis recombined in reverse order of their ionization potential. With its higher ionization potentials, He$^{++}$ (54.5 eV) and He$^+$ (24.6 eV) combined first with free electrons to form the first neutral atom, prior to the recombination of hydrogen (13.6 eV). At that time, in this metal-free and low-density environment, neutral helium atoms formed the Universe's first molecular bond in the helium hydride ion HeH$^+$, by radiative"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.09581","kind":"arxiv","version":1},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1904.09581","created_at":"2026-05-17T23:43:02.479289+00:00"},{"alias_kind":"arxiv_version","alias_value":"1904.09581v1","created_at":"2026-05-17T23:43:02.479289+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.09581","created_at":"2026-05-17T23:43:02.479289+00:00"},{"alias_kind":"pith_short_12","alias_value":"XYYVD3DHMIY6","created_at":"2026-05-18T12:33:33.725879+00:00"},{"alias_kind":"pith_short_16","alias_value":"XYYVD3DHMIY6D6AL","created_at":"2026-05-18T12:33:33.725879+00:00"},{"alias_kind":"pith_short_8","alias_value":"XYYVD3DH","created_at":"2026-05-18T12:33:33.725879+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/XYYVD3DHMIY6D6AL4FAUABWVBA","json":"https://pith.science/pith/XYYVD3DHMIY6D6AL4FAUABWVBA.json","graph_json":"https://pith.science/api/pith-number/XYYVD3DHMIY6D6AL4FAUABWVBA/graph.json","events_json":"https://pith.science/api/pith-number/XYYVD3DHMIY6D6AL4FAUABWVBA/events.json","paper":"https://pith.science/paper/XYYVD3DH"},"agent_actions":{"view_html":"https://pith.science/pith/XYYVD3DHMIY6D6AL4FAUABWVBA","download_json":"https://pith.science/pith/XYYVD3DHMIY6D6AL4FAUABWVBA.json","view_paper":"https://pith.science/paper/XYYVD3DH","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1904.09581&json=true","fetch_graph":"https://pith.science/api/pith-number/XYYVD3DHMIY6D6AL4FAUABWVBA/graph.json","fetch_events":"https://pith.science/api/pith-number/XYYVD3DHMIY6D6AL4FAUABWVBA/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XYYVD3DHMIY6D6AL4FAUABWVBA/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XYYVD3DHMIY6D6AL4FAUABWVBA/action/storage_attestation","attest_author":"https://pith.science/pith/XYYVD3DHMIY6D6AL4FAUABWVBA/action/author_attestation","sign_citation":"https://pith.science/pith/XYYVD3DHMIY6D6AL4FAUABWVBA/action/citation_signature","submit_replication":"https://pith.science/pith/XYYVD3DHMIY6D6AL4FAUABWVBA/action/replication_record"}},"created_at":"2026-05-17T23:43:02.479289+00:00","updated_at":"2026-05-17T23:43:02.479289+00:00"}