Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/95714
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dc.contributor.authorTruong, G.en
dc.contributor.authorAnstie, J.en
dc.contributor.authorMay, E.en
dc.contributor.authorStace, T.en
dc.contributor.authorLuiten, A.en
dc.date.issued2015en
dc.identifier.citationNature communications, 2015; 6(1):8345-1-8345-6en
dc.identifier.issn2041-1723en
dc.identifier.issn2041-1723en
dc.identifier.urihttp://hdl.handle.net/2440/95714-
dc.description.abstractSpectroscopy has an illustrious history delivering serendipitous discoveries and providing a stringent testbed for new physical predictions, including applications from trace materials detection, to understanding the atmospheres of stars and planets, and even constraining cosmological models. Reaching fundamental-noise limits permits optimal extraction of spectroscopic information from an absorption measurement. Here, we demonstrate a quantum-limited spectrometer that delivers high-precision measurements of the absorption lineshape. These measurements yield a very accurate measurement of the excited-state (6P1/2) hyperfine splitting in Cs, and reveals a breakdown in the well-known Voigt spectral profile. We develop a theoretical model that accounts for this breakdown, explaining the observations to within the shot-noise limit. Our model enables us to infer the thermal velocity dispersion of the Cs vapour with an uncertainty of 35 p.p.m. within an hour. This allows us to determine a value for Boltzmann's constant with a precision of 6 p.p.m., and an uncertainty of 71 p.p.m.en
dc.description.statementofresponsibilityG.-W. Truong, J.D. Anstie, E.F. May, T.M. Stace and A.N. Luitenen
dc.language.isoenen
dc.publisherNature Publishing Groupen
dc.rights© 2015 Macmillan Publishers Limited. All rights reserved.en
dc.titleAccurate lineshape spectroscopy and the Boltzmann constanten
dc.typeJournal articleen
dc.identifier.rmid0030037180en
dc.identifier.doi10.1038/ncomms9345en
dc.relation.granthttp://purl.org/au-research/grants/arc/CE1101013en
dc.relation.granthttp://purl.org/au-research/grants/arc/FT0991631en
dc.relation.granthttp://purl.org/au-research/grants/arc/DP1094500en
dc.identifier.pubid216737-
pubs.library.collectionIPAS publicationsen
pubs.library.teamDS14en
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
dc.identifier.orcidLuiten, A. [0000-0001-5284-7244]en
Appears in Collections:IPAS publications

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