Realization of the Pascal based on Argon using a Fabry-Pérot refractometer

Abstract

Based on a recent experimental determination of the static polarizability and a first-principles calculation of the frequency-dependent dipole polarizability of argon, this work presents, by use of a Fabry-Pérot refractometer operated at 1550 nm, a realization of the SI unit of pressure, the pascal, for pressures up to 100 kPa, with an uncertainty of [(0.98 mPa)${}^2+(5.8\times 10^{-6}P{)}^2+(26\times 10^{-12}{P}^2{)}^2{]}^{1/2}$. The work also presents a value of the molar polarizability of N${}_2$ at 1550 nm of 4.396572(26)$\times 10^{-6}$m${}^3$/mol, which agrees well with previously determined ones in the literature.

5 pages, 2 figures