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The uncertainty is\n  2.4 times smaller than achieved by our group in 2003 and more than 4 times smaller than for any independent radio-frequency measurement. The specific combination of the 2S and 1S hyperfine intervals predicted by QED theory $D_{21}=8 f_{\\rm HFS}({2S}) - f_{\\rm HFS}({1S})=48 953(3)$ Hz is in good agreement with the value of 48 923(54) Hz obtained from this experiment."},"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":"0812.3509","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2008-12-18T18:49:44Z","cross_cats_sorted":[],"title_canon_sha256":"c686ce678da5f30e8a57cf5fd76df400912c50cee098aa7b7953b8f86224c1fa","abstract_canon_sha256":"a0a5f766b5c93a81cdf37cdf4d8f4ecb3275196be94fbe1577ce4d7a85b8c9c5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:24:08.675336Z","signature_b64":"heYL+PEIadWduBEMX37eO9J8UtGrrnhx2ax7oDIKwecxUQeof8bVE9f65CEHwdlaNBoDr8jCN3fbyKQWr5S1Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3f0e2576cc7cb15c34c6afc40045f1105929dccd00df8c63c39ed2942fc8d9b2","last_reissued_at":"2026-05-18T03:24:08.674571Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:24:08.674571Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"New Measurement of the 2S Hyperfine Interval in Atomic Hydrogen","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"A. 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