{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:75KGIIK6WNLBCJKNDSVGN63SQ2","short_pith_number":"pith:75KGIIK6","canonical_record":{"source":{"id":"1104.1452","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2011-04-07T22:20:28Z","cross_cats_sorted":[],"title_canon_sha256":"884f9a3555dd747cc49b478eab94e362c24e79b5e11d0f8d01c3138a90d25552","abstract_canon_sha256":"4b524eb3265570c491b71745cc14b689e2e47171996214d97b61fbc500e85454"},"schema_version":"1.0"},"canonical_sha256":"ff5464215eb35611254d1caa66fb7286bd08a0546a58640039f99307270b65b7","source":{"kind":"arxiv","id":"1104.1452","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1104.1452","created_at":"2026-05-18T02:22:10Z"},{"alias_kind":"arxiv_version","alias_value":"1104.1452v3","created_at":"2026-05-18T02:22:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1104.1452","created_at":"2026-05-18T02:22:10Z"},{"alias_kind":"pith_short_12","alias_value":"75KGIIK6WNLB","created_at":"2026-05-18T12:26:22Z"},{"alias_kind":"pith_short_16","alias_value":"75KGIIK6WNLBCJKN","created_at":"2026-05-18T12:26:22Z"},{"alias_kind":"pith_short_8","alias_value":"75KGIIK6","created_at":"2026-05-18T12:26:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:75KGIIK6WNLBCJKNDSVGN63SQ2","target":"record","payload":{"canonical_record":{"source":{"id":"1104.1452","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2011-04-07T22:20:28Z","cross_cats_sorted":[],"title_canon_sha256":"884f9a3555dd747cc49b478eab94e362c24e79b5e11d0f8d01c3138a90d25552","abstract_canon_sha256":"4b524eb3265570c491b71745cc14b689e2e47171996214d97b61fbc500e85454"},"schema_version":"1.0"},"canonical_sha256":"ff5464215eb35611254d1caa66fb7286bd08a0546a58640039f99307270b65b7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:22:10.427798Z","signature_b64":"EsPJPt7Ty55jwZWcgziRJhK9xqQkJfukefFbK0LJinTj+e14jRkPqYv+2CYldxnUVwpjKg38HD62Q3hF0G0lAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ff5464215eb35611254d1caa66fb7286bd08a0546a58640039f99307270b65b7","last_reissued_at":"2026-05-18T02:22:10.427332Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:22:10.427332Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1104.1452","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:22:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9+LxwQYVObS2dDRaKd3w/MGTm+rgJx2ITxIvZ9djmcBwMM/PKemozlal/1I0KKWPEZm5H/6q7Tq86j3z6Rv8Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T22:59:25.972553Z"},"content_sha256":"398fb6324749cf42c297a78187aa4dd5d70beff7630aba11ec177bb36ebe1715","schema_version":"1.0","event_id":"sha256:398fb6324749cf42c297a78187aa4dd5d70beff7630aba11ec177bb36ebe1715"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:75KGIIK6WNLBCJKNDSVGN63SQ2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultrafast laser-triggered emission from hafnium carbide tips","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"Catherine Kealhofer, Mark A. Kasevich, Seth M. Foreman, Stefan Gerlich","submitted_at":"2011-04-07T22:20:28Z","abstract_excerpt":"Electron emission from hafnium carbide (HfC) field emission tips induced by a sub-10 fs, 150 MHz repetition rate Ti:sapphire laser is studied. Two-photon emission is observed at low power with a moderate electric bias field applied to the tips. As the bias field and/or laser power is increased, the average current becomes dominated by thermally-enhanced field emission due to laser heating: both the low thermal conductivity of HfC and the laser's high repetition rate can lead to a temperature rise of several hundred Kelvin at the tip apex. The contribution of current from a thermal transient at"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1104.1452","kind":"arxiv","version":3},"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":"2026-05-18T02:22:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EXcLgFH/i9gN61bTjeYi03u6NAkMW+wJt+bao+7uro9i1b1n3oTgXK+lUocFh/+RAh8VEKF24HahQFoXCQRRBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-01T22:59:25.972909Z"},"content_sha256":"d6172f9eb79871523cb2d7428acb446a31d249dbbda79dfab9b64b107f0f7d95","schema_version":"1.0","event_id":"sha256:d6172f9eb79871523cb2d7428acb446a31d249dbbda79dfab9b64b107f0f7d95"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/75KGIIK6WNLBCJKNDSVGN63SQ2/bundle.json","state_url":"https://pith.science/pith/75KGIIK6WNLBCJKNDSVGN63SQ2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/75KGIIK6WNLBCJKNDSVGN63SQ2/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":"2026-07-01T22:59:25Z","links":{"resolver":"https://pith.science/pith/75KGIIK6WNLBCJKNDSVGN63SQ2","bundle":"https://pith.science/pith/75KGIIK6WNLBCJKNDSVGN63SQ2/bundle.json","state":"https://pith.science/pith/75KGIIK6WNLBCJKNDSVGN63SQ2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/75KGIIK6WNLBCJKNDSVGN63SQ2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:75KGIIK6WNLBCJKNDSVGN63SQ2","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":"4b524eb3265570c491b71745cc14b689e2e47171996214d97b61fbc500e85454","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2011-04-07T22:20:28Z","title_canon_sha256":"884f9a3555dd747cc49b478eab94e362c24e79b5e11d0f8d01c3138a90d25552"},"schema_version":"1.0","source":{"id":"1104.1452","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1104.1452","created_at":"2026-05-18T02:22:10Z"},{"alias_kind":"arxiv_version","alias_value":"1104.1452v3","created_at":"2026-05-18T02:22:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1104.1452","created_at":"2026-05-18T02:22:10Z"},{"alias_kind":"pith_short_12","alias_value":"75KGIIK6WNLB","created_at":"2026-05-18T12:26:22Z"},{"alias_kind":"pith_short_16","alias_value":"75KGIIK6WNLBCJKN","created_at":"2026-05-18T12:26:22Z"},{"alias_kind":"pith_short_8","alias_value":"75KGIIK6","created_at":"2026-05-18T12:26:22Z"}],"graph_snapshots":[{"event_id":"sha256:d6172f9eb79871523cb2d7428acb446a31d249dbbda79dfab9b64b107f0f7d95","target":"graph","created_at":"2026-05-18T02:22:10Z","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":"Electron emission from hafnium carbide (HfC) field emission tips induced by a sub-10 fs, 150 MHz repetition rate Ti:sapphire laser is studied. Two-photon emission is observed at low power with a moderate electric bias field applied to the tips. As the bias field and/or laser power is increased, the average current becomes dominated by thermally-enhanced field emission due to laser heating: both the low thermal conductivity of HfC and the laser's high repetition rate can lead to a temperature rise of several hundred Kelvin at the tip apex. The contribution of current from a thermal transient at","authors_text":"Catherine Kealhofer, Mark A. Kasevich, Seth M. Foreman, Stefan Gerlich","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2011-04-07T22:20:28Z","title":"Ultrafast laser-triggered emission from hafnium carbide tips"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1104.1452","kind":"arxiv","version":3},"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":"sha256:398fb6324749cf42c297a78187aa4dd5d70beff7630aba11ec177bb36ebe1715","target":"record","created_at":"2026-05-18T02:22:10Z","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":"4b524eb3265570c491b71745cc14b689e2e47171996214d97b61fbc500e85454","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2011-04-07T22:20:28Z","title_canon_sha256":"884f9a3555dd747cc49b478eab94e362c24e79b5e11d0f8d01c3138a90d25552"},"schema_version":"1.0","source":{"id":"1104.1452","kind":"arxiv","version":3}},"canonical_sha256":"ff5464215eb35611254d1caa66fb7286bd08a0546a58640039f99307270b65b7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ff5464215eb35611254d1caa66fb7286bd08a0546a58640039f99307270b65b7","first_computed_at":"2026-05-18T02:22:10.427332Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:22:10.427332Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EsPJPt7Ty55jwZWcgziRJhK9xqQkJfukefFbK0LJinTj+e14jRkPqYv+2CYldxnUVwpjKg38HD62Q3hF0G0lAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:22:10.427798Z","signed_message":"canonical_sha256_bytes"},"source_id":"1104.1452","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:398fb6324749cf42c297a78187aa4dd5d70beff7630aba11ec177bb36ebe1715","sha256:d6172f9eb79871523cb2d7428acb446a31d249dbbda79dfab9b64b107f0f7d95"],"state_sha256":"29c24332a5411a242b11f90a5497b364027252968d819f5f143d9ffdf6bc840e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WXlHH7ed1M77k9L9IxzUqlfCzVdDYfvFP/fcslSH5pvKjJThAxDIvHiO799pN/dGcAXd2O2Cq9K8AtM8K6MWDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-01T22:59:25.975084Z","bundle_sha256":"64b3abc06a4e0c9ef0384890f618883e5f6576253f388072e9e9fd0792b4c8cf"}}