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APS » Journals » Phys. Rev. Lett. » Volume 100 » Issue 20
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Phys. Rev. Lett. 100, 200801 (2008) [4 pages]

Primary Gas Thermometry by Means of Laser-Absorption Spectroscopy: Determination of the Boltzmann Constant

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G. Casa, A. Castrillo, G. Galzerano*, R. Wehr, A. Merlone†, D. Di Serafino‡, P. Laporta*, and L. Gianfrani§
Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Via Vivaldi 43, I-81100 Caserta, Italy

Received 21 December 2007; published 21 May 2008

We report on a new optical implementation of primary gas thermometry based on laser-absorption spectrometry in the near infrared. The method consists in retrieving the Doppler broadening from highly accurate observations of the line shape of the R(12) ν1+2ν20+ν3 transition in CO2 gas at thermodynamic equilibrium. Doppler width measurements as a function of gas temperature, ranging between the triple point of water and the gallium melting point, allowed for a spectroscopic determination of the Boltzmann constant with a relative accuracy of ∼1.6×10-4.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.200801
DOI:
10.1103/PhysRevLett.100.200801
PACS:
06.20.Jr, 33.20.−t, 42.62.Fi

*Present address: Dipartimento di Fisica, Politecnico di Milano and Istituto di Fotonica e Nanotecnologie (IFN-CNR), Milano, Italy.

†Present address: Istituto Nazionale di Ricerca Metrologica, Torino, Italy.

‡Present address: Dipartimento di Matematica, Seconda Università di Napoli, Caserta, Italy.

§livio.gianfrani@unina2.it

 
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