{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2022:A4NNZ332CEOWLKYHYA4GA63SLY","short_pith_number":"pith:A4NNZ332","schema_version":"1.0","canonical_sha256":"071adcef7a111d65ab07c038607b725e2231b40a30e02bd80d3ff7df1793d511","source":{"kind":"arxiv","id":"2207.08608","version":1},"attestation_state":"computed","paper":{"title":"Long-Lived States of Methylene Protons in Achiral Molecules","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.chem-ph","authors_text":"Aiky Razanahoera, Anna Sonnefeld, Geoffrey Bodenhausen, Kirill Sheberstov","submitted_at":"2022-07-18T13:54:39Z","abstract_excerpt":"It is shown that long-lived states (LLS) involving pairs of methylene protons in nuclear magnetic resonance (NMR) can be readily excited in common molecules that contain two or more neighboring CH$_2$ groups. Accessing such LLS does not require any isotopic enrichment, nor does it require any stereogenic centers to lift the chemical equivalence of CH$_2$ protons. The excitation of LLS is achieved by polychromatic spinlock-induced crossing (poly-SLIC). In a variety of metabolites, neurotransmitters, vitamins, amino acids, and other molecules, LLS were created for the first time. One can excite "},"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":"2207.08608","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"physics.chem-ph","submitted_at":"2022-07-18T13:54:39Z","cross_cats_sorted":[],"title_canon_sha256":"b3e42d08850ca4f977ac73eb863b91d74d0b849bee16d7ed084d17b64ce1f11a","abstract_canon_sha256":"88529163e1d7b230264fc1adaa471138b062c3e5c4f4fe20d93cea441f6d0a9d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:41:06.564823Z","signature_b64":"4R7f+63xfpRxlthJD5oEz0x131kCVi4OelHlVIHRNXKDNi3quD8J9o1IckdiTFPGkRtDo6o9u0SCQYzXWfw8AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"071adcef7a111d65ab07c038607b725e2231b40a30e02bd80d3ff7df1793d511","last_reissued_at":"2026-07-05T04:41:06.564383Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:41:06.564383Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Long-Lived States of Methylene Protons in Achiral Molecules","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.chem-ph","authors_text":"Aiky Razanahoera, Anna Sonnefeld, Geoffrey Bodenhausen, Kirill Sheberstov","submitted_at":"2022-07-18T13:54:39Z","abstract_excerpt":"It is shown that long-lived states (LLS) involving pairs of methylene protons in nuclear magnetic resonance (NMR) can be readily excited in common molecules that contain two or more neighboring CH$_2$ groups. Accessing such LLS does not require any isotopic enrichment, nor does it require any stereogenic centers to lift the chemical equivalence of CH$_2$ protons. The excitation of LLS is achieved by polychromatic spinlock-induced crossing (poly-SLIC). In a variety of metabolites, neurotransmitters, vitamins, amino acids, and other molecules, LLS were created for the first time. One can excite "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2207.08608","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2207.08608/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2207.08608","created_at":"2026-07-05T04:41:06.564440+00:00"},{"alias_kind":"arxiv_version","alias_value":"2207.08608v1","created_at":"2026-07-05T04:41:06.564440+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2207.08608","created_at":"2026-07-05T04:41:06.564440+00:00"},{"alias_kind":"pith_short_12","alias_value":"A4NNZ332CEOW","created_at":"2026-07-05T04:41:06.564440+00:00"},{"alias_kind":"pith_short_16","alias_value":"A4NNZ332CEOWLKYH","created_at":"2026-07-05T04:41:06.564440+00:00"},{"alias_kind":"pith_short_8","alias_value":"A4NNZ332","created_at":"2026-07-05T04:41:06.564440+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/A4NNZ332CEOWLKYHYA4GA63SLY","json":"https://pith.science/pith/A4NNZ332CEOWLKYHYA4GA63SLY.json","graph_json":"https://pith.science/api/pith-number/A4NNZ332CEOWLKYHYA4GA63SLY/graph.json","events_json":"https://pith.science/api/pith-number/A4NNZ332CEOWLKYHYA4GA63SLY/events.json","paper":"https://pith.science/paper/A4NNZ332"},"agent_actions":{"view_html":"https://pith.science/pith/A4NNZ332CEOWLKYHYA4GA63SLY","download_json":"https://pith.science/pith/A4NNZ332CEOWLKYHYA4GA63SLY.json","view_paper":"https://pith.science/paper/A4NNZ332","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2207.08608&json=true","fetch_graph":"https://pith.science/api/pith-number/A4NNZ332CEOWLKYHYA4GA63SLY/graph.json","fetch_events":"https://pith.science/api/pith-number/A4NNZ332CEOWLKYHYA4GA63SLY/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/A4NNZ332CEOWLKYHYA4GA63SLY/action/timestamp_anchor","attest_storage":"https://pith.science/pith/A4NNZ332CEOWLKYHYA4GA63SLY/action/storage_attestation","attest_author":"https://pith.science/pith/A4NNZ332CEOWLKYHYA4GA63SLY/action/author_attestation","sign_citation":"https://pith.science/pith/A4NNZ332CEOWLKYHYA4GA63SLY/action/citation_signature","submit_replication":"https://pith.science/pith/A4NNZ332CEOWLKYHYA4GA63SLY/action/replication_record"}},"created_at":"2026-07-05T04:41:06.564440+00:00","updated_at":"2026-07-05T04:41:06.564440+00:00"}