Optical Third-Harmonic Coefficients for Inert Gases

Abstract

Optical third-harmonic coefficients ${\alpha }_{\mathrm{zzzz}}\left(3\mathrm{}\nu \right)$ for the inert gases have been calculated taking the $\mathrm{LS}$ coupling scheme for helium and $\mathrm{Jj}$ and $\mathrm{jl}$ coupling schemes for neon, argon, and krypton. Our calculated values agree reasonably well with the experimental values of set (i) of Ward and New.