Anisotropies of the Na2–rare gas interaction potentials from angularly resolved inelastic scattering

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Abstract
Rotational rainbow angular positions in the inelastic differential scattering cross sections of argon, krypton, and xenon from Na2 are reported. The observed transitions for small rotational quantum number change (Δj≤16) are analyzed in terms of the classical model of hard ellipsoid scattering which relates the rainbow angle to the anisotropy ε of the potential, where ε is the difference in length of the long and short axes. The analysis yields ε=0.67±0.05, 0.79±0.09, and 0.66±0.05 Å for the systems Na2–Ar, Kr, and Xe, respectively. From earlier work, the anisotropies for Na2–He and Na2–Ne are known to be ε=0.70 (calculated) and 0.72±0.05 Å. The data demonstrate the similarity within this model for the anisotropies of all the Na2–rare gas interaction potentials for low effective collision energies.