A New Precision Spectroscopy Based Method for Boltzmann Constant Determination and Primary Thermometry

Year: 2018

Authors: Santamaria L. A., Siciliani de Cumis S., Dequal D., Bianco G., Cancio P.

Autors Affiliation: [Luigi, Santamaria Amato; de Cumis, Mario Siciliani; Dequal, Daniele; Bianco, Giuseppe] Agenzia Spaziale Italiana, Ctr Geodesia Spaziale, I-75100 Matera, Italy.
[Pablo, Cancio Pastor] CNR, INO, Largo E Fermi 6, I-50125 Florence, Italy.

Abstract: We propose a new independent thermometry method, line strength ratio thermometry (LRT), based on optical spectroscopy measurement of the line strength intensity ratio R between pairs of molecular transitions. Due to strong dependence of R on kT, a given measurement uncertainty delta R for R reflects in a small uncertainty of kT determination. By assuming experimental uncertainties of R and T to be those reported in literature, we foresee a k determination at the 5 ppm level, which is better than the most precise k determination by using Doppler broadening thermometry (DBT). In the frame of a new definition of the SI Kelvin unit, based on k as fixed constant, once the k constant is exactly established, LRT is proposed as a high resolution noncontact thermometry technique for absolute temperature measurements of gas samples at the ppm level.


Volume: 122 (28)      Pages from: 6026  to: 6030

KeyWords: quantum cascade laser; gas thermometry; frequency comb; units;
DOI: 10.1021/acs.jpca.8b05523

Citations: 3
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