{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:IJO3O6T6TLVEC2GZVDD2HZ4NLZ","short_pith_number":"pith:IJO3O6T6","canonical_record":{"source":{"id":"1606.01841","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-06-06T17:34:20Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"f5edb4adc4d9cee5b3cb4e1499fbd0dd1a0dfa563821d7bfa063e205eeb83581","abstract_canon_sha256":"c79dc24c3a9502d8b8c0c92822f2d199d6d0f81a83d266d85ae2abe02bea1f86"},"schema_version":"1.0"},"canonical_sha256":"425db77a7e9aea4168d9a8c7a3e78d5e79fcbe41686f985b1c046a2cb7f44578","source":{"kind":"arxiv","id":"1606.01841","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.01841","created_at":"2026-05-18T01:00:19Z"},{"alias_kind":"arxiv_version","alias_value":"1606.01841v1","created_at":"2026-05-18T01:00:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.01841","created_at":"2026-05-18T01:00:19Z"},{"alias_kind":"pith_short_12","alias_value":"IJO3O6T6TLVE","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"IJO3O6T6TLVEC2GZ","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"IJO3O6T6","created_at":"2026-05-18T12:30:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:IJO3O6T6TLVEC2GZVDD2HZ4NLZ","target":"record","payload":{"canonical_record":{"source":{"id":"1606.01841","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-06-06T17:34:20Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"f5edb4adc4d9cee5b3cb4e1499fbd0dd1a0dfa563821d7bfa063e205eeb83581","abstract_canon_sha256":"c79dc24c3a9502d8b8c0c92822f2d199d6d0f81a83d266d85ae2abe02bea1f86"},"schema_version":"1.0"},"canonical_sha256":"425db77a7e9aea4168d9a8c7a3e78d5e79fcbe41686f985b1c046a2cb7f44578","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:00:19.286898Z","signature_b64":"y4NmetjNgSwG7tuORcacX3OYhJ/+LElWtUD8AiJPD1GVJc+gZX3uY2BUHYlqN9J6yqLJDZkvGJ38L/1Ga+rRAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"425db77a7e9aea4168d9a8c7a3e78d5e79fcbe41686f985b1c046a2cb7f44578","last_reissued_at":"2026-05-18T01:00:19.286301Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:00:19.286301Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1606.01841","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":"2026-05-18T01:00:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EqioCv9OvBhlDb7M93G91u90ysWlBUrZGD4G3PtBO3gy/F1niP04jqKijDal/W4k4U+lZI/UoQA7UAOSWdP4Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T21:28:11.127733Z"},"content_sha256":"5a36db2034bef8e97972992ef3079870b2d1d821b201b300526e5c23ea3395df","schema_version":"1.0","event_id":"sha256:5a36db2034bef8e97972992ef3079870b2d1d821b201b300526e5c23ea3395df"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:IJO3O6T6TLVEC2GZVDD2HZ4NLZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Dynamic disorder, phonon lifetimes, and the assignment of modes to the vibrational spectra of methylammonium lead halide perovskites","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Alejandro R. Go\\~ni, Anuradha Pallipurath, Aron Walsh, Aur\\'elien M. A. Leguy, Federico Brivio, Jarvist M. Frost, Jenny Nelson, Jonathan Skelton, Mariano Campoy-Quiles, Mark T. Weller, M. Isabel Alonso, Oliver J. Weber, Piers R. F. Barnes, Xabier Rodr\\'iguez-Mart\\'inez","submitted_at":"2016-06-06T17:34:20Z","abstract_excerpt":"We present Raman and terahertz absorbance spectra of methylammonium lead halide single crystals (MAPbX3, X = I, Br, Cl) at temperatures between 80 and 370 K. These results show good agreement with density-functional-theory phonon calculations.1 Comparison of experimental spectra and calculated vibrational modes enables confident assignment of most of the vibrational features between 50 and 3500 cm-1. Reorientation of the methylammonium cations, unlocked in their cavities at the orthorhombic-to-tetragonal phase transition, plays a key role in shaping the vibrational spectra of the different com"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.01841","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:00:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ktP3qOWLHGnV8d7/0lC+WrDUE1xuOka6AbtCXOQIxuj+hcR7cmbTmVMqtMdOFsdk0zRPpcgHHf66vqjrSibeCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T21:28:11.128145Z"},"content_sha256":"1f5543247cde3b06432192f1de5ce050bd7f405fb033f000dd80d56cb254559a","schema_version":"1.0","event_id":"sha256:1f5543247cde3b06432192f1de5ce050bd7f405fb033f000dd80d56cb254559a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IJO3O6T6TLVEC2GZVDD2HZ4NLZ/bundle.json","state_url":"https://pith.science/pith/IJO3O6T6TLVEC2GZVDD2HZ4NLZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IJO3O6T6TLVEC2GZVDD2HZ4NLZ/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":"2026-05-25T21:28:11Z","links":{"resolver":"https://pith.science/pith/IJO3O6T6TLVEC2GZVDD2HZ4NLZ","bundle":"https://pith.science/pith/IJO3O6T6TLVEC2GZVDD2HZ4NLZ/bundle.json","state":"https://pith.science/pith/IJO3O6T6TLVEC2GZVDD2HZ4NLZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IJO3O6T6TLVEC2GZVDD2HZ4NLZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:IJO3O6T6TLVEC2GZVDD2HZ4NLZ","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":"c79dc24c3a9502d8b8c0c92822f2d199d6d0f81a83d266d85ae2abe02bea1f86","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-06-06T17:34:20Z","title_canon_sha256":"f5edb4adc4d9cee5b3cb4e1499fbd0dd1a0dfa563821d7bfa063e205eeb83581"},"schema_version":"1.0","source":{"id":"1606.01841","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1606.01841","created_at":"2026-05-18T01:00:19Z"},{"alias_kind":"arxiv_version","alias_value":"1606.01841v1","created_at":"2026-05-18T01:00:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.01841","created_at":"2026-05-18T01:00:19Z"},{"alias_kind":"pith_short_12","alias_value":"IJO3O6T6TLVE","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"IJO3O6T6TLVEC2GZ","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"IJO3O6T6","created_at":"2026-05-18T12:30:22Z"}],"graph_snapshots":[{"event_id":"sha256:1f5543247cde3b06432192f1de5ce050bd7f405fb033f000dd80d56cb254559a","target":"graph","created_at":"2026-05-18T01:00:19Z","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 present Raman and terahertz absorbance spectra of methylammonium lead halide single crystals (MAPbX3, X = I, Br, Cl) at temperatures between 80 and 370 K. These results show good agreement with density-functional-theory phonon calculations.1 Comparison of experimental spectra and calculated vibrational modes enables confident assignment of most of the vibrational features between 50 and 3500 cm-1. Reorientation of the methylammonium cations, unlocked in their cavities at the orthorhombic-to-tetragonal phase transition, plays a key role in shaping the vibrational spectra of the different com","authors_text":"Alejandro R. Go\\~ni, Anuradha Pallipurath, Aron Walsh, Aur\\'elien M. A. Leguy, Federico Brivio, Jarvist M. Frost, Jenny Nelson, Jonathan Skelton, Mariano Campoy-Quiles, Mark T. Weller, M. Isabel Alonso, Oliver J. Weber, Piers R. F. Barnes, Xabier Rodr\\'iguez-Mart\\'inez","cross_cats":["physics.chem-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-06-06T17:34:20Z","title":"Dynamic disorder, phonon lifetimes, and the assignment of modes to the vibrational spectra of methylammonium lead halide perovskites"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.01841","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":"sha256:5a36db2034bef8e97972992ef3079870b2d1d821b201b300526e5c23ea3395df","target":"record","created_at":"2026-05-18T01:00:19Z","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":"c79dc24c3a9502d8b8c0c92822f2d199d6d0f81a83d266d85ae2abe02bea1f86","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-06-06T17:34:20Z","title_canon_sha256":"f5edb4adc4d9cee5b3cb4e1499fbd0dd1a0dfa563821d7bfa063e205eeb83581"},"schema_version":"1.0","source":{"id":"1606.01841","kind":"arxiv","version":1}},"canonical_sha256":"425db77a7e9aea4168d9a8c7a3e78d5e79fcbe41686f985b1c046a2cb7f44578","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"425db77a7e9aea4168d9a8c7a3e78d5e79fcbe41686f985b1c046a2cb7f44578","first_computed_at":"2026-05-18T01:00:19.286301Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:00:19.286301Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"y4NmetjNgSwG7tuORcacX3OYhJ/+LElWtUD8AiJPD1GVJc+gZX3uY2BUHYlqN9J6yqLJDZkvGJ38L/1Ga+rRAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:00:19.286898Z","signed_message":"canonical_sha256_bytes"},"source_id":"1606.01841","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5a36db2034bef8e97972992ef3079870b2d1d821b201b300526e5c23ea3395df","sha256:1f5543247cde3b06432192f1de5ce050bd7f405fb033f000dd80d56cb254559a"],"state_sha256":"90e94c4f976a12543af16331e52071e193bbd1ed12bfff0c5a8660523208cffe"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xEPTVVCA9luo8Bk5rW7/Uwsi8BWqH2y9g/uSYFEOv6jowDMOJz3L4SGkRgsymuSf7XowXb2hfVmimmL2GFO2BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T21:28:11.131178Z","bundle_sha256":"19728c3c0d6f96d9aedb769def7e4922e67d13c4d504dd5af106873b9e211a95"}}