Accurate lineshape spectroscopy and the Boltzmann constant

Truong, G.-W., Anstie, J. D., May, E. F., Stace, T. M. and Luiten, A. N. (2015) Accurate lineshape spectroscopy and the Boltzmann constant. Nature Communications, 6 8245: 1-6. doi:10.1038/ncomms9345


Author Truong, G.-W.
Anstie, J. D.
May, E. F.
Stace, T. M.
Luiten, A. N.
Title Accurate lineshape spectroscopy and the Boltzmann constant
Journal name Nature Communications   Check publisher's open access policy
ISSN 2041-1723
Publication date 2015-10-14
Year available 2015
Sub-type Article (original research)
DOI 10.1038/ncomms9345
Open Access Status DOI
Volume 6
Issue 8245
Start page 1
End page 6
Total pages 6
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Subject 1600 Chemistry
1300 Biochemistry, Genetics and Molecular Biology
3100 Physics and Astronomy
Abstract Spectroscopy 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.
Keyword Multidisciplinary Sciences
Science & Technology - Other Topics
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID CE110001013
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
 
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