First direct determination of the Boltzmann constant by an optical method

Details First direct determination of the Boltzmann constant by an optical method First direct determination of the Boltzmann constant by an optical method

2007-01-24

arxiv.org/abs/quant-ph/0701176v1

physical review Letters 98 (18/06/2007) 250801

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.98.250801

We have recorded the Doppler profile of a well-isolated rovibrational line in the \nu2 band of 14NH3. 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, kB, by laser spectroscopy. A relative uncertainty of 2x10-4 has been obtained. The present determination should be significantly improved in the near future and contribute to a new definition of the kelvin.

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