NDLI: Precision laser absorption spectroscopy for primary thermometry

Content Provider	IEEE Xplore Digital Library
Author	Gar-Wing Truong Anstie, J.D. Stace, T.M. May, E.F. Luiten, A.N.
Copyright Year	2011
Description	Author affiliation: Centre for Energy, School of Mechanical and Chemical Engineering, The University of Western Australia, Perth, WA 6009, Australia (May, E.F.) \|\| Frequency Standards and Metrology Research Group, School of Physics, The University of Western Australia, Perth WA 6009, Australia (Gar-Wing Truong; Anstie, J.D.; Luiten, A.N.) \|\| School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia (Stace, T.M.)
Abstract	There is currently a global effort to refine high-accuracy primary thermometry techniques driven by a call from the Bureau des Internationale de Poid et Measures to remeasure the Boltzmann constant, k, in preparation for the upcoming redefinition of the kelvin. We have used quantitative laser spectroscopy to precisely measure the Doppler broadening of atomic transitions in rubidium and cesium vapors. By using a conventional platinum resistance thermometer and the Doppler thermometry technique, we were able to determine k with a relative uncertainty of 1.4 × $10^{−4}.$ Our experiment, using an effusive atomic vapor, departs significantly from other Doppler-broadened thermometry (DBT) techniques, which rely on weakly absorbing molecules in a diffusive regime. In these circumstances, the dominant systematic effects strongly differ from those of the molecular experiments and thus can lend further confidence if the outcomes of the experiments are all in agreement.
Starting Page	1087
Ending Page	1089
File Size	277618
Page Count	3
File Format	PDF
ISBN	9781457719394
e-ISBN	9780977565788
DOI	10.1109/IQEC-CLEO.2011.6193970
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-28
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical pumping Measurement by laser beam Spectroscopy Uncertainty Nonlinear optics Temperature measurement Educational institutions
Content Type	Text
Resource Type	Article

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