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The transition frequencies are determined by one-photon UV spectroscopy in ultracold samples of Cs atoms using a narrowband laser system referenced to a frequency comb. From a global fit of the ionization energy $E_\\mathrm{I}$ and the quantum defects of the two series we determine an improved value of $E_\\mathrm{I} = h c \\cdot 31 406.467 732 5(14)$ cm$^{-1}$ for the ionization energy of Cs with a relative uncertainty of $5\\times10^{-11}$"},"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":"1601.08005","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2016-01-29T09:01:24Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"0810d6abd1184a027935d03ab91a5e0740b6fcf6770ec9bef7ed80c11d0e87b5","abstract_canon_sha256":"d629b773ca2c940ffdea546c17ac262e9bda65c24a34571f21c7451aa292d033"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:21:41.259494Z","signature_b64":"Rqq/dX2p7QnNe1sWIH9HNcu6vJ8ziG6VjOJEhInZF0DszqTjC0piCiszt3QJgXReZWy+4yBhhVzX+A1oNbElBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f78b8e2c106b64bbdd95a195505740afc43e3c2f3d50f554fb28c742bf2326b9","last_reissued_at":"2026-05-18T01:21:41.258904Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:21:41.258904Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Precision measurement of the ionization energy of Cs I","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"physics.atom-ph","authors_text":"Fr\\'ed\\'eric Merkt, Hansj\\\"urg Schmutz, Heiner Sa{\\ss}mannshausen, Holger Herburger, Johannes Deiglmayr, Paul Jansen","submitted_at":"2016-01-29T09:01:24Z","abstract_excerpt":"We present absolute-frequency measurements for the transitions from the 6s$_{1/2}$ ground state of $^{133}$Cs to $n$p$_{1/2}$ and $n$p$_{3/2}$ Rydberg states. 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