{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:ZI6S4FJMNZ2M3MHNIKZW22L5MX","short_pith_number":"pith:ZI6S4FJM","canonical_record":{"source":{"id":"2408.15423","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.chem-ph","submitted_at":"2024-08-27T21:55:34Z","cross_cats_sorted":["cond-mat.stat-mech"],"title_canon_sha256":"f07c196e1e92a6f00f49fa66ac7b8289e6aa98bf63008a516c0e9546e92fc990","abstract_canon_sha256":"ae10aa83a533f3dad9b0ab21b84b9d340f8897f0798beab838669e29b2a1e6a7"},"schema_version":"1.0"},"canonical_sha256":"ca3d2e152c6e74cdb0ed42b36d697d65d31a7249ad0687cc96d2dc534d29b949","source":{"kind":"arxiv","id":"2408.15423","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2408.15423","created_at":"2026-07-05T10:09:08Z"},{"alias_kind":"arxiv_version","alias_value":"2408.15423v1","created_at":"2026-07-05T10:09:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2408.15423","created_at":"2026-07-05T10:09:08Z"},{"alias_kind":"pith_short_12","alias_value":"ZI6S4FJMNZ2M","created_at":"2026-07-05T10:09:08Z"},{"alias_kind":"pith_short_16","alias_value":"ZI6S4FJMNZ2M3MHN","created_at":"2026-07-05T10:09:08Z"},{"alias_kind":"pith_short_8","alias_value":"ZI6S4FJM","created_at":"2026-07-05T10:09:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:ZI6S4FJMNZ2M3MHNIKZW22L5MX","target":"record","payload":{"canonical_record":{"source":{"id":"2408.15423","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.chem-ph","submitted_at":"2024-08-27T21:55:34Z","cross_cats_sorted":["cond-mat.stat-mech"],"title_canon_sha256":"f07c196e1e92a6f00f49fa66ac7b8289e6aa98bf63008a516c0e9546e92fc990","abstract_canon_sha256":"ae10aa83a533f3dad9b0ab21b84b9d340f8897f0798beab838669e29b2a1e6a7"},"schema_version":"1.0"},"canonical_sha256":"ca3d2e152c6e74cdb0ed42b36d697d65d31a7249ad0687cc96d2dc534d29b949","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:09:08.066801Z","signature_b64":"/zETALbGE5F6LHv+7ea3B64uoyskGC8/WUgXDNosO2/GKf8cqXg0Gy6t3u/6GC+N056c0ci1nKgrBoxx1AP1Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ca3d2e152c6e74cdb0ed42b36d697d65d31a7249ad0687cc96d2dc534d29b949","last_reissued_at":"2026-07-05T10:09:08.066390Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:09:08.066390Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2408.15423","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:09:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Cbwo/jjT4B9oClnr2xWaVKFaAjZBzCPZnrevRAQSplQkoIP9E3zv7eARO4/NgLuGuw5vluen3nuy7EYzSwlHAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T14:46:58.853278Z"},"content_sha256":"0d2329c296cfbc5f8ae4e5deb7aa7443db50f3cda88113a51f9d159e20115f53","schema_version":"1.0","event_id":"sha256:0d2329c296cfbc5f8ae4e5deb7aa7443db50f3cda88113a51f9d159e20115f53"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:ZI6S4FJMNZ2M3MHNIKZW22L5MX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Adsorption of Guanidinium Cations to the Air-Water Interface","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cond-mat.stat-mech"],"primary_cat":"physics.chem-ph","authors_text":"Amro Dodin, Constantine Kyprianou, David T. Limmer, Franky Bernal, Richard J. Saykally","submitted_at":"2024-08-27T21:55:34Z","abstract_excerpt":"Combining Deep-UV second harmonic generation spectroscopy with molecular simulations, we confirm and quantify the specific adsorption of guanidinium cations to the air-water interface. Using a Langmuir analysis and measurements at multiple concentrations, we extract the Gibbs free energy of adsorption, finding it larger than typical thermal energies. Molecular simulations clarify the role of polarizability in tuning the thermodynamics of adsorption, and establish the preferential parallel alignment of guanidinium at the air-water interface. Guanidinium is the first polyatomic cation proven to "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2408.15423","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/2408.15423/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:09:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2ba18LXV6f8Zs0muT2zoIndZv7l2CvYX+6DKKcYKMpb0AkTdBbPfzqQ/KOH1//OMP/EqA4EHDSkJYNvQos/ZAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T14:46:58.853833Z"},"content_sha256":"b1536bcc2b861be75b0808ed55339c8a33074e4420c182657e7dfb82f0dd64d3","schema_version":"1.0","event_id":"sha256:b1536bcc2b861be75b0808ed55339c8a33074e4420c182657e7dfb82f0dd64d3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZI6S4FJMNZ2M3MHNIKZW22L5MX/bundle.json","state_url":"https://pith.science/pith/ZI6S4FJMNZ2M3MHNIKZW22L5MX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZI6S4FJMNZ2M3MHNIKZW22L5MX/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":"2026-08-23T14:46:58Z","links":{"resolver":"https://pith.science/pith/ZI6S4FJMNZ2M3MHNIKZW22L5MX","bundle":"https://pith.science/pith/ZI6S4FJMNZ2M3MHNIKZW22L5MX/bundle.json","state":"https://pith.science/pith/ZI6S4FJMNZ2M3MHNIKZW22L5MX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZI6S4FJMNZ2M3MHNIKZW22L5MX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:ZI6S4FJMNZ2M3MHNIKZW22L5MX","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":"ae10aa83a533f3dad9b0ab21b84b9d340f8897f0798beab838669e29b2a1e6a7","cross_cats_sorted":["cond-mat.stat-mech"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.chem-ph","submitted_at":"2024-08-27T21:55:34Z","title_canon_sha256":"f07c196e1e92a6f00f49fa66ac7b8289e6aa98bf63008a516c0e9546e92fc990"},"schema_version":"1.0","source":{"id":"2408.15423","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2408.15423","created_at":"2026-07-05T10:09:08Z"},{"alias_kind":"arxiv_version","alias_value":"2408.15423v1","created_at":"2026-07-05T10:09:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2408.15423","created_at":"2026-07-05T10:09:08Z"},{"alias_kind":"pith_short_12","alias_value":"ZI6S4FJMNZ2M","created_at":"2026-07-05T10:09:08Z"},{"alias_kind":"pith_short_16","alias_value":"ZI6S4FJMNZ2M3MHN","created_at":"2026-07-05T10:09:08Z"},{"alias_kind":"pith_short_8","alias_value":"ZI6S4FJM","created_at":"2026-07-05T10:09:08Z"}],"graph_snapshots":[{"event_id":"sha256:b1536bcc2b861be75b0808ed55339c8a33074e4420c182657e7dfb82f0dd64d3","target":"graph","created_at":"2026-07-05T10:09:08Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2408.15423/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Combining Deep-UV second harmonic generation spectroscopy with molecular simulations, we confirm and quantify the specific adsorption of guanidinium cations to the air-water interface. Using a Langmuir analysis and measurements at multiple concentrations, we extract the Gibbs free energy of adsorption, finding it larger than typical thermal energies. Molecular simulations clarify the role of polarizability in tuning the thermodynamics of adsorption, and establish the preferential parallel alignment of guanidinium at the air-water interface. Guanidinium is the first polyatomic cation proven to ","authors_text":"Amro Dodin, Constantine Kyprianou, David T. Limmer, Franky Bernal, Richard J. Saykally","cross_cats":["cond-mat.stat-mech"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.chem-ph","submitted_at":"2024-08-27T21:55:34Z","title":"Adsorption of Guanidinium Cations to the Air-Water Interface"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2408.15423","kind":"arxiv","version":1},"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":"sha256:0d2329c296cfbc5f8ae4e5deb7aa7443db50f3cda88113a51f9d159e20115f53","target":"record","created_at":"2026-07-05T10:09:08Z","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":"ae10aa83a533f3dad9b0ab21b84b9d340f8897f0798beab838669e29b2a1e6a7","cross_cats_sorted":["cond-mat.stat-mech"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.chem-ph","submitted_at":"2024-08-27T21:55:34Z","title_canon_sha256":"f07c196e1e92a6f00f49fa66ac7b8289e6aa98bf63008a516c0e9546e92fc990"},"schema_version":"1.0","source":{"id":"2408.15423","kind":"arxiv","version":1}},"canonical_sha256":"ca3d2e152c6e74cdb0ed42b36d697d65d31a7249ad0687cc96d2dc534d29b949","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ca3d2e152c6e74cdb0ed42b36d697d65d31a7249ad0687cc96d2dc534d29b949","first_computed_at":"2026-07-05T10:09:08.066390Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:09:08.066390Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/zETALbGE5F6LHv+7ea3B64uoyskGC8/WUgXDNosO2/GKf8cqXg0Gy6t3u/6GC+N056c0ci1nKgrBoxx1AP1Bw==","signature_status":"signed_v1","signed_at":"2026-07-05T10:09:08.066801Z","signed_message":"canonical_sha256_bytes"},"source_id":"2408.15423","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0d2329c296cfbc5f8ae4e5deb7aa7443db50f3cda88113a51f9d159e20115f53","sha256:b1536bcc2b861be75b0808ed55339c8a33074e4420c182657e7dfb82f0dd64d3"],"state_sha256":"f442978f08fd0cfc95b37038b180ebef9dbc42ca42be85462a84e9d54c6c85df"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bYfwpO3H257sHotY2235rZ+irfvHPIihyuzQFtZ4sLacfhCffq5k3XAx0KCktQ8fEi8F9zzTWFiV4n2cKN8MCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T14:46:58.858439Z","bundle_sha256":"8af534b870260ce8590c9931539fc4122de05b2ea38acbeca1b96db40dc06a6e"}}