Abstract
Crossed molecular beam experiments have been performed measuring differential cross sections for Na scattered from CH 3I, (CH 3) 3CCl, (CH 3) 3CBr and (CH 3) 3CI at collision energies of 0.170 to 0.220 eV. The angular distributions show pronounced double rainbow structure which is attributed to the anisotropy of the interaction potential. The origin and the conditions for this structure are investigated by calculations in the infinite order sudden approximation. The effect is used to determine the anisotropic interaction potentials for the measured systems which all exhibit minima in the linear configuration of the collision complex ranging from 30 to 60 meV.
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