{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:WCS5WUC3U6DJFGTJHS45BTH5XH","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":"2012d62aeaae17631077623180e1d5a7ba21453db9e5537ad749027b159b4b64","cross_cats_sorted":["physics.atom-ph","physics.chem-ph","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-02-28T17:54:20Z","title_canon_sha256":"893a1cb833030dca02a6d507464a776c2fb6deb97ad3a129afa2053492f0552b"},"schema_version":"1.0","source":{"id":"1902.11249","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.11249","created_at":"2026-05-17T23:52:25Z"},{"alias_kind":"arxiv_version","alias_value":"1902.11249v1","created_at":"2026-05-17T23:52:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.11249","created_at":"2026-05-17T23:52:25Z"},{"alias_kind":"pith_short_12","alias_value":"WCS5WUC3U6DJ","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"WCS5WUC3U6DJFGTJ","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"WCS5WUC3","created_at":"2026-05-18T12:33:30Z"}],"graph_snapshots":[{"event_id":"sha256:e94c855715a98394a28c36697e66c27b6e65c37014be92bd1533831ff41c7daf","target":"graph","created_at":"2026-05-17T23:52:25Z","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":"A laser frequency combs is a broad spectrum composed of equidistant narrow lines. Initially invented for frequency metrology, such combs enable new approaches to spectroscopy over broad spectral bandwidths, of particular relevance to molecules. With optical frequency combs, the performance of existing spectrometers, such as Michelson-based Fourier transform interferometers or crossed dispersers, involving e.g. virtual imaging phase array (VIPA) \\'etalons, is dramatically enhanced. Novel types of instruments, such as dual-comb spectrometers, lead to a new class of devices without moving parts f","authors_text":"Nathalie Picqu\\'e, Theodor W. H\\\"ansch","cross_cats":["physics.atom-ph","physics.chem-ph","physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-02-28T17:54:20Z","title":"Frequency comb spectroscopy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.11249","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":"sha256:200ee312b883a3e4b8fc74e52a84b50eb050ea2bbb06b0cbd80268bc8c47fae2","target":"record","created_at":"2026-05-17T23:52:25Z","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":"2012d62aeaae17631077623180e1d5a7ba21453db9e5537ad749027b159b4b64","cross_cats_sorted":["physics.atom-ph","physics.chem-ph","physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-02-28T17:54:20Z","title_canon_sha256":"893a1cb833030dca02a6d507464a776c2fb6deb97ad3a129afa2053492f0552b"},"schema_version":"1.0","source":{"id":"1902.11249","kind":"arxiv","version":1}},"canonical_sha256":"b0a5db505ba786929a693cb9d0ccfdb9c6bb536847d0b4b0c2b41916b0cebb2e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b0a5db505ba786929a693cb9d0ccfdb9c6bb536847d0b4b0c2b41916b0cebb2e","first_computed_at":"2026-05-17T23:52:25.097125Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:52:25.097125Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ka6eMr4GALhkdPdDGW1ytKxJR4fWOwgeWMYZqrXb5jW1AxLjegsPwVTvcTFmHDEUfzNLsju8PsXkvhWF4kknCQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:52:25.097841Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.11249","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:200ee312b883a3e4b8fc74e52a84b50eb050ea2bbb06b0cbd80268bc8c47fae2","sha256:e94c855715a98394a28c36697e66c27b6e65c37014be92bd1533831ff41c7daf"],"state_sha256":"778419c13a27eacb05ea1c839a71cdb868fe0710539aa8a27ba31d1c8c2982da"}