Collision-induced absorption in He-Ar mixture

The absorption coefficient for collision-induced absorption in a He-Ar mixture is calculated for frequencies between 67 and 733 ${\mathrm{cm}}^{-1\mathrm{}}$ in the 200-400 °K temperature range. Starting with a Lennard-Jones (6-12) interatomic potential derived from atomic-beam work, the absorption coefficient is computed for five different dipole-moment functions. The calculation is quantum mechanical, dynamically exact, and uses no adjustable parameters. The results are compared with the room-temperature experimental results as well as with previous theoretical work.