Abstract
Description is given about the structure and characteristics of an apparatus recently constructed for scattering experiments of ion beams, in the energy range of 500-4000 eV, in collision with room temperature gas molecules. Attenuation method with this apparatus gives a total cross section of elastic scattering through effective laboratory angles greater than 5× 10-3 rad. The repulsive potential determined by the experiment on K+ -Ar system is well represented by V(r)=1780 exp(-3.46r)eV for1.79<r<2.43(A)in good agreement with the result obtained by Amdur, et al.
