Refractive index of solid krypton and solid argon

Abstract

Jones and Smith (1960) determined the refractive index (n) of solid argon over the temperature range 74°K to 84°K. The results indicated a probable increase of the Lorentz-Lorenz function (n ²- 1)/(n ² + 2)ρ with increasing density (ρ) but this result depended upon a revised assessment of the available measurements of density near the triple point. In this note corresponding measurements of the refractive index of solid krypton are reported, together with some new determinations of the density of solid argon near the triple point which confirm the conclusion of the earlier paper.