A comment on the measurements of the Verdet coefficient for inert gases

Experimental Faraday effect data of Ingersoll and Liebenberg for the inert gases helium, neon, argon, krypton and xenon are re-evaluated. From the data for helium a direct calculation of the atomic polarizability at the zero frequency, density limit is obtained and compared with recent discussions. Anomalies exhibited by the neon data are discussed.