{"id":"https://openalex.org/W3026166183","doi":"https://doi.org/10.1088/1681-7575/abb530","title":"A strontium optical lattice clock with 1 \u00d7 10 \u221217 uncertainty and measurement of its absolute frequency","display_name":"A strontium optical lattice clock with 1 \u00d7 10 \u221217 uncertainty and measurement of its absolute frequency","publication_year":2020,"publication_date":"2020-09-03","ids":{"openalex":"https://openalex.org/W3026166183","doi":"https://doi.org/10.1088/1681-7575/abb530","mag":"3026166183"},"language":"en","primary_location":{"id":"doi:10.1088/1681-7575/abb530","doi":"https://doi.org/10.1088/1681-7575/abb530","is_oa":true,"landing_page_url":"https://doi.org/10.1088/1681-7575/abb530","pdf_url":"https://iopscience.iop.org/article/10.1088/1681-7575/abb530/pdf","source":{"id":"https://openalex.org/S7291761","display_name":"Metrologia","issn_l":"0026-1394","issn":["0026-1394","1681-7575"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-b","jufo-2","norway-1","poland-70","russia-white-list-2"],"host_organization":"https://openalex.org/P4310320083","host_organization_name":"IOP Publishing","host_organization_lineage":["https://openalex.org/P4310320083","https://openalex.org/P4310311669"],"host_organization_lineage_names":["IOP Publishing","Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Metrologia","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["arxiv","crossref","datacite"],"open_access":{"is_oa":true,"oa_status":"bronze","oa_url":"https://iopscience.iop.org/article/10.1088/1681-7575/abb530/pdf","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5074530942","display_name":"Richard Hobson","orcid":"https://orcid.org/0000-0002-2838-8241","observed_orcids":["https://orcid.org/0000-0002-2838-8241"]},"institutions":[{"id":"https://openalex.org/I134421475","display_name":"National Physical Laboratory","ror":"https://ror.org/015w2mp89","country_code":"GB","type":"facility","lineage":["https://openalex.org/I134421475"]}],"countries":["GB"],"is_corresponding":true,"raw_author_name":"Richard Hobson","raw_affiliation_strings":["National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom","institution_ids":["https://openalex.org/I134421475"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5020015806","display_name":"William Bowden","orcid":"https://orcid.org/0000-0001-6139-0506","observed_orcids":["https://orcid.org/0000-0001-6139-0506"]},"institutions":[{"id":"https://openalex.org/I134421475","display_name":"National Physical Laboratory","ror":"https://ror.org/015w2mp89","country_code":"GB","type":"facility","lineage":["https://openalex.org/I134421475"]},{"id":"https://openalex.org/I40120149","display_name":"University of Oxford","ror":"https://ror.org/052gg0110","country_code":"GB","type":"education","lineage":["https://openalex.org/I40120149"]}],"countries":["GB"],"is_corresponding":true,"raw_author_name":"William Bowden","raw_affiliation_strings":["Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom","National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom"],"raw_orcid":"https://orcid.org/0000-0001-6139-0506","affiliations":[{"raw_affiliation_string":"Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom","institution_ids":["https://openalex.org/I40120149"]},{"raw_affiliation_string":"National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom","institution_ids":["https://openalex.org/I134421475"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5030837318","display_name":"Alvise Vianello","orcid":"https://orcid.org/0000-0001-8958-5786","observed_orcids":["https://orcid.org/0000-0001-8958-5786"]},"institutions":[{"id":"https://openalex.org/I134421475","display_name":"National Physical Laboratory","ror":"https://ror.org/015w2mp89","country_code":"GB","type":"facility","lineage":["https://openalex.org/I134421475"]},{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":true,"raw_author_name":"Alvise Vianello","raw_affiliation_strings":["Department of Physics, Imperial College London, London SW7 2BB, United Kingdom","National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom"],"raw_orcid":"https://orcid.org/0000-0001-8958-5786","affiliations":[{"raw_affiliation_string":"Department of Physics, Imperial College London, London SW7 2BB, United Kingdom","institution_ids":["https://openalex.org/I47508984"]},{"raw_affiliation_string":"National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom","institution_ids":["https://openalex.org/I134421475"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5002342447","display_name":"Alissa Silva","orcid":"https://orcid.org/0000-0003-3387-7354","observed_orcids":["https://orcid.org/0000-0003-3387-7354"]},"institutions":[{"id":"https://openalex.org/I134421475","display_name":"National Physical Laboratory","ror":"https://ror.org/015w2mp89","country_code":"GB","type":"facility","lineage":["https://openalex.org/I134421475"]}],"countries":["GB"],"is_corresponding":true,"raw_author_name":"Alissa Silva","raw_affiliation_strings":["National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom","institution_ids":["https://openalex.org/I134421475"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5068871121","display_name":"Charles F. A. Baynham","orcid":"https://orcid.org/0000-0003-4191-8486","observed_orcids":["https://orcid.org/0000-0003-4191-8486"]},"institutions":[{"id":"https://openalex.org/I134421475","display_name":"National Physical Laboratory","ror":"https://ror.org/015w2mp89","country_code":"GB","type":"facility","lineage":["https://openalex.org/I134421475"]},{"id":"https://openalex.org/I40120149","display_name":"University of Oxford","ror":"https://ror.org/052gg0110","country_code":"GB","type":"education","lineage":["https://openalex.org/I40120149"]}],"countries":["GB"],"is_corresponding":true,"raw_author_name":"Charles F A Baynham","raw_affiliation_strings":["Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom","National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom"],"raw_orcid":"https://orcid.org/0000-0003-4191-8486","affiliations":[{"raw_affiliation_string":"Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom","institution_ids":["https://openalex.org/I40120149"]},{"raw_affiliation_string":"National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom","institution_ids":["https://openalex.org/I134421475"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5065490379","display_name":"Helen S. Margolis","orcid":"https://orcid.org/0000-0002-8991-3855","observed_orcids":["https://orcid.org/0000-0002-8991-3855"]},"institutions":[{"id":"https://openalex.org/I134421475","display_name":"National Physical Laboratory","ror":"https://ror.org/015w2mp89","country_code":"GB","type":"facility","lineage":["https://openalex.org/I134421475"]},{"id":"https://openalex.org/I40120149","display_name":"University of Oxford","ror":"https://ror.org/052gg0110","country_code":"GB","type":"education","lineage":["https://openalex.org/I40120149"]}],"countries":["GB"],"is_corresponding":true,"raw_author_name":"Helen S Margolis","raw_affiliation_strings":["Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom","National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom"],"raw_orcid":"https://orcid.org/0000-0002-8991-3855","affiliations":[{"raw_affiliation_string":"Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom","institution_ids":["https://openalex.org/I40120149"]},{"raw_affiliation_string":"National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom","institution_ids":["https://openalex.org/I134421475"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5054932858","display_name":"P. E. G. Baird","orcid":"https://orcid.org/0000-0001-9498-8889","observed_orcids":["https://orcid.org/0000-0001-9498-8889"]},"institutions":[{"id":"https://openalex.org/I40120149","display_name":"University of Oxford","ror":"https://ror.org/052gg0110","country_code":"GB","type":"education","lineage":["https://openalex.org/I40120149"]}],"countries":["GB"],"is_corresponding":true,"raw_author_name":"Patrick E G Baird","raw_affiliation_strings":["Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom","institution_ids":["https://openalex.org/I40120149"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5071073936","display_name":"Patrick Robert Gill","orcid":"https://orcid.org/0000-0002-2920-888X","observed_orcids":["https://orcid.org/0000-0002-2920-888X"]},"institutions":[{"id":"https://openalex.org/I134421475","display_name":"National Physical Laboratory","ror":"https://ror.org/015w2mp89","country_code":"GB","type":"facility","lineage":["https://openalex.org/I134421475"]},{"id":"https://openalex.org/I40120149","display_name":"University of Oxford","ror":"https://ror.org/052gg0110","country_code":"GB","type":"education","lineage":["https://openalex.org/I40120149"]}],"countries":["GB"],"is_corresponding":true,"raw_author_name":"Patrick Gill","raw_affiliation_strings":["Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom","National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom","institution_ids":["https://openalex.org/I40120149"]},{"raw_affiliation_string":"National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom","institution_ids":["https://openalex.org/I134421475"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5081637581","display_name":"Ian R. Hill","orcid":"https://orcid.org/0000-0002-0123-6838","observed_orcids":["https://orcid.org/0000-0002-0123-6838"]},"institutions":[{"id":"https://openalex.org/I134421475","display_name":"National Physical Laboratory","ror":"https://ror.org/015w2mp89","country_code":"GB","type":"facility","lineage":["https://openalex.org/I134421475"]}],"countries":["GB"],"is_corresponding":true,"raw_author_name":"Ian R Hill","raw_affiliation_strings":["National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom"],"raw_orcid":"https://orcid.org/0000-0002-0123-6838","affiliations":[{"raw_affiliation_string":"National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom","institution_ids":["https://openalex.org/I134421475"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":3,"corresponding_author_ids":["https://openalex.org/A5002342447","https://openalex.org/A5020015806","https://openalex.org/A5030837318","https://openalex.org/A5054932858","https://openalex.org/A5065490379","https://openalex.org/A5068871121","https://openalex.org/A5071073936","https://openalex.org/A5074530942","https://openalex.org/A5081637581"],"corresponding_institution_ids":["https://openalex.org/I134421475","https://openalex.org/I40120149","https://openalex.org/I47508984"],"apc_list":{"value":3325,"currency":"USD","value_usd":3325},"apc_paid":null,"fwci":2.3508,"has_fulltext":true,"cited_by_count":50,"citation_normalized_percentile":{"value":0.89911175,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":93,"max":99},"biblio":{"volume":"57","issue":"6","first_page":"065026","last_page":"065026"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12004","display_name":"Advanced Frequency and Time Standards","score":1.0,"subfield":{"id":"https://openalex.org/subfields/3107","display_name":"Atomic and Molecular Physics, and Optics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T12004","display_name":"Advanced Frequency and Time Standards","score":1.0,"subfield":{"id":"https://openalex.org/subfields/3107","display_name":"Atomic and Molecular Physics, and Optics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11890","display_name":"Scientific Measurement and Uncertainty Evaluation","score":0.0,"subfield":{"id":"https://openalex.org/subfields/3105","display_name":"Instrumentation"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12300","display_name":"Advanced Electrical Measurement Techniques","score":0.0,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/strontium-optical-lattice-clock","display_name":"strontium optical lattice clock","score":0.871999979019165},{"id":"https://openalex.org/keywords/87sr","display_name":"87Sr","score":0.9020000100135803},{"id":"https://openalex.org/keywords/absolute-frequency-measurement","display_name":"absolute frequency measurement","score":0.8679999709129333},{"id":"https://openalex.org/keywords/si-second","display_name":"SI second","score":0.6330000162124634},{"id":"https://openalex.org/keywords/systematic-frequency-shifts","display_name":"systematic frequency shifts","score":0.7070000171661377},{"id":"https://openalex.org/keywords/frequency-uncertainty","display_name":"frequency uncertainty","score":0.39899998903274536},{"id":"https://openalex.org/keywords/international-atomic-time","display_name":"International Atomic Time","score":0.6850000023841858}],"concepts":[{"id":"https://openalex.org/C93751859","wikidata":"https://www.wikidata.org/wiki/Q2027451","display_name":"Optical lattice","level":3,"score":0.6592258214950562},{"id":"https://openalex.org/C2994224358","wikidata":"https://www.wikidata.org/wiki/Q13649246","display_name":"Standard uncertainty","level":3,"score":0.5667870044708252},{"id":"https://openalex.org/C131221115","wikidata":"https://www.wikidata.org/wiki/Q362396","display_name":"Frequency standard","level":2,"score":0.5588812232017517},{"id":"https://openalex.org/C137209882","wikidata":"https://www.wikidata.org/wiki/Q1403517","display_name":"Measurement uncertainty","level":2,"score":0.5494066476821899},{"id":"https://openalex.org/C2781204021","wikidata":"https://www.wikidata.org/wiki/Q6497091","display_name":"Lattice (music)","level":2,"score":0.5356701612472534},{"id":"https://openalex.org/C196597080","wikidata":"https://www.wikidata.org/wiki/Q227467","display_name":"Atomic clock","level":2,"score":0.5133708715438843},{"id":"https://openalex.org/C518915863","wikidata":"https://www.wikidata.org/wiki/Q938","display_name":"Strontium","level":2,"score":0.49746015667915344},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.4954937696456909},{"id":"https://openalex.org/C195766429","wikidata":"https://www.wikidata.org/wiki/Q394","display_name":"Metrology","level":2,"score":0.4653879702091217},{"id":"https://openalex.org/C97278139","wikidata":"https://www.wikidata.org/wiki/Q81182","display_name":"Absolute zero","level":2,"score":0.4555661678314209},{"id":"https://openalex.org/C30475298","wikidata":"https://www.wikidata.org/wiki/Q909554","display_name":"Computational physics","level":1,"score":0.4350108504295349},{"id":"https://openalex.org/C184779094","wikidata":"https://www.wikidata.org/wiki/Q26383","display_name":"Atomic physics","level":1,"score":0.38197147846221924},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.34344130754470825},{"id":"https://openalex.org/C121864883","wikidata":"https://www.wikidata.org/wiki/Q677916","display_name":"Statistical physics","level":1,"score":0.3229222595691681},{"id":"https://openalex.org/C120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","level":1,"score":0.3226831555366516},{"id":"https://openalex.org/C62520636","wikidata":"https://www.wikidata.org/wiki/Q944","display_name":"Quantum mechanics","level":1,"score":0.1958734691143036},{"id":"https://openalex.org/C185544564","wikidata":"https://www.wikidata.org/wiki/Q81197","display_name":"Nuclear physics","level":1,"score":0.19500717520713806},{"id":"https://openalex.org/C24890656","wikidata":"https://www.wikidata.org/wiki/Q82811","display_name":"Acoustics","level":1,"score":0.10472962260246277},{"id":"https://openalex.org/C25536358","wikidata":"https://www.wikidata.org/wiki/Q106667","display_name":"Superfluidity","level":2,"score":0.0}],"mesh":[],"locations_count":4,"locations":[{"id":"doi:10.1088/1681-7575/abb530","doi":"https://doi.org/10.1088/1681-7575/abb530","is_oa":true,"landing_page_url":"https://doi.org/10.1088/1681-7575/abb530","pdf_url":"https://iopscience.iop.org/article/10.1088/1681-7575/abb530/pdf","source":{"id":"https://openalex.org/S7291761","display_name":"Metrologia","issn_l":"0026-1394","issn":["0026-1394","1681-7575"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-b","jufo-2","norway-1","poland-70","russia-white-list-2"],"host_organization":"https://openalex.org/P4310320083","host_organization_name":"IOP Publishing","host_organization_lineage":["https://openalex.org/P4310320083","https://openalex.org/P4310311669"],"host_organization_lineage_names":["IOP Publishing","Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Metrologia","raw_type":"journal-article"},{"id":"pmh:oai:arXiv.org:2005.10857","doi":null,"is_oa":true,"landing_page_url":"http://arxiv.org/abs/2005.10857","pdf_url":"https://arxiv.org/pdf/2005.10857","source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"text"},{"id":"pmh:oai:eprints.ucl.ac.uk.OAI2:10147641","doi":null,"is_oa":false,"landing_page_url":"https://discovery.ucl.ac.uk/id/eprint/10147641/","pdf_url":null,"source":{"id":"https://openalex.org/S4306400024","display_name":"UCL Discovery (University College London)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I45129253","host_organization_name":"University College London","host_organization_lineage":["https://openalex.org/I45129253"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Metrologia , 57 (6) , Article 065026. (2020)","raw_type":"Article"},{"id":"doi:10.48550/arxiv.2005.10857","doi":"https://doi.org/10.48550/arxiv.2005.10857","is_oa":true,"landing_page_url":"https://doi.org/10.48550/arxiv.2005.10857","pdf_url":null,"source":{"id":"https://openalex.org/S4306400194","display_name":"arXiv (Cornell University)","issn_l":"2331-8422","issn":["2331-8422"],"is_oa":true,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I205783295","host_organization_name":"Cornell University","host_organization_lineage":["https://openalex.org/I205783295"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":"article-journal"}],"best_oa_location":{"id":"doi:10.1088/1681-7575/abb530","doi":"https://doi.org/10.1088/1681-7575/abb530","is_oa":true,"landing_page_url":"https://doi.org/10.1088/1681-7575/abb530","pdf_url":"https://iopscience.iop.org/article/10.1088/1681-7575/abb530/pdf","source":{"id":"https://openalex.org/S7291761","display_name":"Metrologia","issn_l":"0026-1394","issn":["0026-1394","1681-7575"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-b","jufo-2","norway-1","poland-70","russia-white-list-2"],"host_organization":"https://openalex.org/P4310320083","host_organization_name":"IOP Publishing","host_organization_lineage":["https://openalex.org/P4310320083","https://openalex.org/P4310311669"],"host_organization_lineage_names":["IOP Publishing","Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Metrologia","raw_type":"journal-article"},"sustainable_development_goals":[],"study_designs":[],"awards":[{"id":"https://openalex.org/G1487468959","display_name":null,"funder_award_id":"15SIB03 \u201cOC18\u201d","funder_id":"https://openalex.org/F4320338394","funder_display_name":"European Metrology Programme for Innovation and Research"},{"id":"https://openalex.org/G2880660377","display_name":null,"funder_award_id":"15SIB03","funder_id":"https://openalex.org/F4320338394","funder_display_name":"European Metrology Programme for Innovation and Research"},{"id":"https://openalex.org/G4653915163","display_name":null,"funder_award_id":"SIB55-ITOC","funder_id":"https://openalex.org/F4320313458","funder_display_name":"European Association of National Metrology Institutes"},{"id":"https://openalex.org/G7330474162","display_name":null,"funder_award_id":"15SIB03-OC18","funder_id":"https://openalex.org/F4320313458","funder_display_name":"European Association of National Metrology Institutes"}],"funders":[{"id":"https://openalex.org/F4320312933","display_name":"Department for Business, Energy and Industrial Strategy, UK Government","ror":"https://ror.org/019ya6433"},{"id":"https://openalex.org/F4320313458","display_name":"European Association of National Metrology Institutes","ror":"https://ror.org/03csrq586"},{"id":"https://openalex.org/F4320320300","display_name":"European Commission","ror":"https://ror.org/00k4n6c32"},{"id":"https://openalex.org/F4320338394","display_name":"European Metrology Programme for Innovation and Research","ror":"https://ror.org/042k5q325"}],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W3026166183.pdf","grobid_xml":"https://content.openalex.org/works/W3026166183.grobid-xml"},"referenced_works_count":97,"referenced_works":["https://openalex.org/W1828427991","https://openalex.org/W1939294614","https://openalex.org/W1965276912","https://openalex.org/W1969928411","https://openalex.org/W1986906454","https://openalex.org/W1989221171","https://openalex.org/W1991731564","https://openalex.org/W1995655737","https://openalex.org/W1995840092","https://openalex.org/W2002119104","https://openalex.org/W2007132189","https://openalex.org/W2009958141","https://openalex.org/W2011144370","https://openalex.org/W2013573047","https://openalex.org/W2015575484","https://openalex.org/W2016860894","https://openalex.org/W2017506794","https://openalex.org/W2019389329","https://openalex.org/W2021772724","https://openalex.org/W2021909579","https://openalex.org/W2023494863","https://openalex.org/W2032078432","https://openalex.org/W2042620409","https://openalex.org/W2043850228","https://openalex.org/W2047595182","https://openalex.org/W2055074816","https://openalex.org/W2055997412","https://openalex.org/W2058209208","https://openalex.org/W2065737281","https://openalex.org/W2066746329","https://openalex.org/W2069914545","https://openalex.org/W2070410132","https://openalex.org/W2072099674","https://openalex.org/W2073489541","https://openalex.org/W2073958075","https://openalex.org/W2076039468","https://openalex.org/W2084431730","https://openalex.org/W2085868878","https://openalex.org/W2098371052","https://openalex.org/W2113944695","https://openalex.org/W2121832766","https://openalex.org/W2131819852","https://openalex.org/W2141829094","https://openalex.org/W2147430953","https://openalex.org/W2148106425","https://openalex.org/W2151958322","https://openalex.org/W2159731143","https://openalex.org/W2162126832","https://openalex.org/W2170619459","https://openalex.org/W2233029113","https://openalex.org/W2252829057","https://openalex.org/W2262162657","https://openalex.org/W2265805915","https://openalex.org/W2271355027","https://openalex.org/W2279201053","https://openalex.org/W2287800111","https://openalex.org/W2295004978","https://openalex.org/W2295139653","https://openalex.org/W2356207235","https://openalex.org/W2466471046","https://openalex.org/W2521124600","https://openalex.org/W2523316020","https://openalex.org/W2531397648","https://openalex.org/W2542630258","https://openalex.org/W2559131273","https://openalex.org/W2578211730","https://openalex.org/W2595844539","https://openalex.org/W2605002306","https://openalex.org/W2605209510","https://openalex.org/W2612253094","https://openalex.org/W2728318801","https://openalex.org/W2743882218","https://openalex.org/W2763613630","https://openalex.org/W2773728726","https://openalex.org/W2785731053","https://openalex.org/W2794062977","https://openalex.org/W2871261900","https://openalex.org/W2902127691","https://openalex.org/W2903630052","https://openalex.org/W2907461682","https://openalex.org/W2916254706","https://openalex.org/W2931365765","https://openalex.org/W2935935908","https://openalex.org/W2945884165","https://openalex.org/W2949469742","https://openalex.org/W2954292079","https://openalex.org/W2962718768","https://openalex.org/W2962890181","https://openalex.org/W2963666495","https://openalex.org/W2982223298","https://openalex.org/W2999639132","https://openalex.org/W3014491804","https://openalex.org/W3016766079","https://openalex.org/W3024242885","https://openalex.org/W3098907617","https://openalex.org/W3103665728","https://openalex.org/W4285719527"],"related_works":["https://openalex.org/W7034136547","https://openalex.org/W1969928411","https://openalex.org/W4313539443","https://openalex.org/W3046808934","https://openalex.org/W2121832766","https://openalex.org/W7202136143","https://openalex.org/W3143605276","https://openalex.org/W2103870848","https://openalex.org/W3132886050","https://openalex.org/W1965276912"],"abstract_inverted_index":{"Abstract":[0],"We":[1,35,132],"present":[2],"a":[3,28,60,123],"measurement":[4],"of":[5,9,31,64,75,101,108,126,158,171],"the":[6,10,32,37,44,72,94,102,106,109,141,145,172,187],"absolute":[7,169],"frequency":[8,55,107,147,162,170],"5":[11],"s":[12],"2":[13],"1":[14,65,127],"S":[15],"0":[16,21],"to":[17,71,81,111,122,155],"5s5p":[18],"3":[19],"P":[20],"transition":[22,110,173],"in":[23,49,134,175,183],"87":[24],"Sr":[25],"which":[26,120,164],"is":[27,77,174],"secondary":[29,161],"representation":[30],"SI":[33],"second.":[34],"describe":[36,133],"optical":[38,146],"lattice":[39,95],"clock":[40,96],"apparatus":[41],"used":[42],"for":[43],"measurement,":[45],"and":[46,90,160],"we":[47,104],"focus":[48],"detail":[50,135],"on":[51,98],"how":[52,136],"its":[53],"systematic":[54],"shifts":[56],"are":[57],"evaluated":[58],"with":[59,93,178],"total":[61],"fractional":[62,124],"uncertainty":[63,125,138],"\u00d7":[66,128],"10":[67,129],"\u221217":[68],".":[69,131],"Traceability":[70],"International":[73,82],"System":[74],"Units":[76],"provided":[78],"via":[79],"comparison":[80],"Atomic":[83],"Time":[84],"(TAI).":[85],"Gathering":[86],"data":[87],"over":[88],"5-":[89],"15-day":[91],"periods,":[92],"operating":[97],"average":[99],"74%":[100],"time,":[103],"measure":[105],"be":[112],"429":[113],"228":[114],"004":[115],"229":[116],"873.1":[117],"(5)":[118],"Hz,":[119],"corresponds":[121],"\u221215":[130],"this":[137],"arises":[139],"from":[140],"intermediate":[142],"steps":[143],"linking":[144],"standard,":[148],"through":[149],"our":[150],"local":[151],"time":[152],"scale":[153],"UTC(NPL),":[154],"an":[156],"ensemble":[157],"primary":[159],"standards":[163],"steer":[165],"TAI.":[166],"The":[167],"calculated":[168],"good":[176],"agreement":[177],"recent":[179],"measurements":[180],"carried":[181],"out":[182],"other":[184],"laboratories":[185],"around":[186],"world.":[188]},"counts_by_year":[{"year":2026,"cited_by_count":4},{"year":2025,"cited_by_count":13},{"year":2024,"cited_by_count":10},{"year":2023,"cited_by_count":9},{"year":2022,"cited_by_count":8},{"year":2021,"cited_by_count":4},{"year":2020,"cited_by_count":2}],"updated_date":"2026-11-07T11:25:07.637180","created_date":"2020-05-29T00:00:00"}