All Title Author
Keywords Abstract

Physics  2007 

First direct determination of the Boltzmann constant by an optical method

DOI: 10.1103/PhysRevLett.98.250801

Full-Text   Cite this paper   Add to My Lib


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.


comments powered by Disqus

Contact Us


微信:OALib Journal