Linestrength ratio spectroscopy as a new primary thermometer for redefined Kelvin dissemination. (1st November 2019)

• Record Type: Journal Article
• Authors: Santamaria Amato, Luigi; Siciliani de Cumis, Mario; Bianco, Giuseppe; Pastore, Raffaele; Cancio Pastor, Pablo
• Is Part Of: New journal of physics. Volume 21:Number 11(2019:Nov.)
• Publication Date: 2019-11-01
• Subjects: molecular spectroscopy -- primary thermometry -- laser spectroscopy -- carbon monoxide -- rare earth doped crystal -- Kelvin dissemination; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/ab4d07
• Languages: English
• ISSNs: 1367-2630

Abstract

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.