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 R12 1 202 3 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 1:6 104.

Primary Gas Thermometry by Means of Laser-Absorption Spectroscopy: Determination of the Boltzmann Constant / G., Casa; A., Castrillo; G., Galzerano; R., Wehr; Merlone, Andrea; D., DI SERAFINO; P., Laporta; AND L., Gianfrani. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 100:(2008), pp. 200801-1-200801-4. [10.1103/PhysRevLett. 100.200801]

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

MERLONE, ANDREA;
2008

Abstract

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 R12 1 202 3 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 1:6 104.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/30139
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