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 Publish in OALib Journal ISSN: 2333-9721 APC: Only $99  Views Downloads  Relative Articles Determination of the Boltzmann Constant Using the Differential - Cylindrical Procedure Progress towards an accurate determination of the Boltzmann constant by Doppler spectroscopy Primary gas thermometry by means of laser-absorption spectroscopy: Determination of the Boltzmann constant Determination of the Boltzmann constant by laser spectroscopy as a basis for future measurements of the thermodynamic temperature Accurate determination of the Boltzmann constant by Doppler spectroscopy: Towards a new definition of the kelvin Evidence for speed-dependent effects in NH3 self-broadened spectra: towards a new determination of the Boltzmann constant Spectrophotometric Determination of the First Hydrolysis Constant of Praseodymium (III) An Electronic Measurement of the Boltzmann Constant First direct determination of the superallowed$β$-decay$Q_{EC}$-value for$^{14}\$O Measurement of the Boltzmann constant by the Doppler broadening technique at a 3,8x10-5 accuracy level More...
Physics  2007

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

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Abstract:

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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