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- W2314310419 abstract "We report on a new implementation of Doppler broadening thermometry based on precision absorption spectroscopy by means of a pair of offset-frequency locked extended-cavity diode lasers at $1.39text{ }text{ }ensuremath{mu}mathrm{m}$. The method consists in the highly accurate observation of the shape of the ${4}_{4,1}ensuremath{rightarrow}{4}_{4,0}$ line of the ${mathrm{H}}_{2}^{18}mathrm{O}$ ${ensuremath{nu}}_{1}+{ensuremath{nu}}_{3}$ band, in a water vapor sample at thermodynamic equilibrium. A sophisticated and extremely refined spectral analysis procedure is adopted for the retrieval of the Doppler width as a function of the gas pressure, taking into account the Dicke narrowing effect, the speed dependence of relaxation rates, and the physical correlation between velocity-changing and dephasing collisions. A spectroscopic determination of the Boltzmann constant with a combined (type $A$ and type $B$) uncertainty of 24 parts over ${10}^{6}$ is reported. This is the best result obtained so far by means of an optical method. Our determination is in agreement with the recommended CODATA value." @default.
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- W2314310419 date "2013-08-08" @default.
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- W2314310419 title "Determination of the Boltzmann Constant by Means of Precision Measurements of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi mathvariant=normal>H</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mmultiscripts><mml:mi mathvariant=normal>O</mml:mi><mml:mprescripts /><mml:none /><mml:mn>18</mml:mn></mml:mmultiscripts></mml:math>Line Shapes at<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mn>1.39</mml:mn><mml:mtext> </mml:…" @default.
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- W2314310419 doi "https://doi.org/10.1103/physrevlett.111.060803" @default.
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