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

2008/04/11 by Giovanni Della Casa, G. Casa, A. Castrillo +9 · 4 citations
Chemistry · Decision Sciences · Earth and Planetary Sciences · Physics and Astronomy · #Atmospheric Ozone and Climate #Scientific Measurement and Uncertainty Evaluation #Spectroscopy and Laser Applications #cond-mat.stat-mech

paper · pdf · doi:10.1103/physrevlett.100.200801

Submitted to Physical Review Letters

arxiv created 2008/04/11 · openalex publication_date 2008/05/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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) \ensuremathν₁+2\ensuremathν₂⁰+\ensuremathν₃ 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 \ensuremath∼1.6\ifmmode×\else\texttimes\fi10^\ensuremath-4.

Citations

• Computation of the Complex Error Function

Cited by

• Primary Tunnel Junction Thermometry
• Progress towards an accurate determination of the Boltzmann constant by Doppler spectroscopy
• Quantum limits of thermometry
• Measuring the Boltzmann constant by mid-infrared laser spectroscopy of ammonia

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