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

• Isak Silander, Johan Zakrisson, Ove Axner, and Martin Zelan
• received 03/11/2024; accepted 04/11/2024; posted 04/12/2024; Doc. ID 523293
• 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+(5.8x10 ^(−6)P)^2+(26×10^(−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) × 10^-6 m^3/mol, which agrees well with previously determined ones in the literature.