Polarizability of Helium, Neon, and Argon: New Perspectives For Gas Metrology

With dielectric-constant gas thermometry (DCGT), the molar polarizability of helium, neon and argon has been determined with relative standard uncertainties of about 2 parts per million (ppm). A series of isotherms measured with the three noble gases and two different experimental setups led to this unprecedented level of uncertainty. This data is crucial for scientists in the field of gas metrology, working on pressure and temperature standards. Furthermore, with the new benchmark values for neon and argon, theoretical calculations, today about three orders of magnitude larger in uncertainty, can be checked and improved.

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