Anisotropic collision-induced Raman scattering by Ne-Ne: Evidence for a nonsmooth spectral wing

We report the anisotropic collision-induced scattering CIS spectrum of two neon atoms at room temperature. The covered spectral range hitherto restricted to 170 cm−1 is here tripled. Both our measurements and quantum-mechanical calculations obtained on the basis of large-scale ab initio anisotropy representations reveal a well-defined saddle-shaped wing. This peculiar structure is experimental evidence of a binary CIS line shape with an aspect other than a smooth wing in a logarithmic plot. Equally interesting is the fact that this feature has been predicted though only qualitatively by the simple semiempirical model long ago reported by Meinander, Tabisz, and Zoppi J. Chem. Phys. 84, 3005 1986 , but no emphasis had at that time been placed on the aspect of the wing of the model spectrum probably due to the lack of high-frequency experimental data.

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