Linestrength ratio spectroscopy as a new primary thermometer for redefined Kelvin dissemination

Year: 2019

Authors: Santamaria Amato L., Siciliani de Cumis M., Bianco G., Pastore R., Cancio P.

Autors Affiliation: Ctr Geodesia Spaziale, ASI, I-75100 Matera, Italy; Univ Naples Federico II, Dept Chem Mat & Prod Engn, Ple Tecchio 80, I-80125 Naples, Italy; CNR, INO, Via N Carrara 1, I-50019 Sesto Fiorentino, Italy

Abstract: Experimental methods for primary thermometry, after Kelvin unit redefinition on May 2019, become based on a known value of the Boltzmann constant rather than by measuring temperature with respect to a reference point. In this frame, we propose linestrength ratio thermometry (LRT) as a candidate method for primary thermometry in the 9?700 K temperature range. Temperature accuracies at the ppm level are prospected for LRT applied to optical transitions of the CO molecule in the range 80?700 K and of a rare-earth-doped crystal in the 9?100 K one. Future implementations of this technique can contribute to measure the calibration-discrepancies in the ITS-90 metrological scale of thermodynamic temperature which can have a measurable impact in applications ranging from fundamental-physics to meteorology and climatology.


Volume: 21 (11)      Pages from: 113008-1  to: 113008-10

More Information: The authors acknowledge partially financial support by: Project MOST funded by Agenzia Spaziale Italiana, project WhiTech funded by Agenzia Spaziale Italiana and Progetti di Ricerca di Interesse Nazionale (PRIN), Project No. 20152MRAKH of the Italian Ministry of University and Research. We acknowledged I Galli for experimental support and discussions regarding N2O experimental test.
KeyWords: molecular spectroscopy; primary thermometry; laser spectroscopy; carbon monoxide; rare earth doped crystal; Kelvin dissemination
DOI: 10.1088/1367-2630/ab4d07

Citations: 4
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