publication . Preprint . Article . 2008

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

Casa, Giovanni; Castrillo, Antonio; Galzerano, G.; Wehr, R.; Merlone, A.; DI SERAFINO, Daniela; Laporta, P.; Gianfrani, Livio;
Open Access English
  • Published: 21 May 2008
  • Country: Italy
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 R(12) $\nu_{1} + 2 \nu_{2}^{\phantom{1}0} + \nu_{3}$ transition in CO$_{2}$ 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 $\sim1.6\times10^{-4}$.
Subjects
arXiv: Astrophysics::Galaxy Astrophysics
free text keywords: Condensed Matter - Statistical Mechanics, Doppler effect — Molecular spectra — Fundamental metrology —, General Physics and Astronomy, Boltzmann constant, symbols.namesake, symbols, Atomic physics, Absorption spectroscopy, Gallium, chemistry.chemical_element, chemistry, Melting point, Triple point, Doppler broadening, Spectroscopy, Physics, Thermodynamic equilibrium

§ Electronic address: livio.gianfrani@unina2.it

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publication . Preprint . Article . 2008

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

Casa, Giovanni; Castrillo, Antonio; Galzerano, G.; Wehr, R.; Merlone, A.; DI SERAFINO, Daniela; Laporta, P.; Gianfrani, Livio;