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https://hdl.handle.net/2440/95714
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Type: | Journal article |
Title: | Accurate lineshape spectroscopy and the Boltzmann constant |
Author: | Truong, G. Anstie, J. May, E. Stace, T. Luiten, A. |
Citation: | Nature Communications, 2015; 6(1):8345-1-8345-6 |
Publisher: | Nature Publishing Group |
Issue Date: | 2015 |
ISSN: | 2041-1723 2041-1723 |
Statement of Responsibility: | G.-W. Truong, J.D. Anstie, E.F. May, T.M. Stace and A.N. Luiten |
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. |
Rights: | © 2015 Macmillan Publishers Limited. All rights reserved. |
DOI: | 10.1038/ncomms9345 |
Grant ID: | http://purl.org/au-research/grants/arc/CE1101013 http://purl.org/au-research/grants/arc/FT0991631 http://purl.org/au-research/grants/arc/DP1094500 |
Published version: | http://dx.doi.org/10.1038/ncomms9345 |
Appears in Collections: | Aurora harvest 3 IPAS publications |
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