Scientific Results

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.

Journal/Review: NEW JOURNAL OF PHYSICS

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

KeyWords: molecular spectroscopy; primary thermometry; laser spectroscopy; carbon monoxide; rare earth doped crystal; Kelvin dissemination
DOI: 10.1088/1367-2630/ab4d07

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