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- W2077004080 abstract "We have recorded the Doppler profile of a well-isolated rovibrational line in the ${ensuremath{nu}}_{2}$ band of $^{14}mathrm{NH}_{3}$. Ammonia gas was placed in an absorption cell thermalized by a water-ice bath. By extrapolating to zero pressure, we have deduced the Doppler width which gives a first measurement of the Boltzmann constant ${k}_{B}$ by laser spectroscopy. A relative uncertainty of $2ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}$ has been obtained. The present determination should be significantly improved in the near future and contribute to a new definition of the kelvin." @default.
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- W2077004080 date "2007-06-18" @default.
- W2077004080 modified "2023-10-10" @default.
- W2077004080 title "Direct Determination of the Boltzmann Constant by an Optical Method" @default.
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- W2077004080 doi "https://doi.org/10.1103/physrevlett.98.250801" @default.
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