Differential scattering in collisions of K⁺ions with Ar atoms

Charge-overlap effect on the electronic transitions in moderate-energy collisions between closed-shell particles with rare-gas structure

“…2,5,22 All the crossing features deduced with the model for symmetric and quasisymmetric systems coincide with those by the MO and energy correlation diagrams. 11 Figure 3 exhibits the difference potentials for the asymmetric Li ϩ -Ne and largely asymmetric Li ϩ -Ar calculated with the overlap model in the same way as for the Na ϩ -Ne.…”

“…Concerning the transitions occurring at the outermost distance, the R c determined experimentally for the M ϩ -Rg systems agrees well with the sum of the atomic radii r i and r j of the interacting particles i and j, [5][6][7][8] which holds also for molecular collisions. 9 ͓The potential height V(R c ) at R c is 40-65 eV, depending weakly on the systems.͔ [5][6][7][8] The distance R c for M ϩ -Rg is almost the same as that for the quasi-one-electron ͑alkali-atom-rare-gas-atom M-Rg͒ system. 10 Furthermore, as is well-known, a twoelectron transition with high excitation energy takes place at nearly the same R c as that for a one-electron transition.…”

“…[5][6][7][8] Since the initial electronic state is X 1 ⌺ ϩ for collisions of closed-shell particles, we have taken into account only the transitions between 1 ⌺ ϩ states with the same symmetry. In order to check the accuracy of our model potential given by Eq.…”

“…Nevertheless, all the transitions take place at a well-defined internuclear distance, and one can directly deduce the critical ͑diabatic crossing͒ distance R c for each transition from differential scattering experiments by referring to the experimental ground-state potential. [5][6][7][8] With increases in the collision energy and scattering angle, excitations taking place at smaller internuclear distances have been observed. Concerning the transitions occurring at the outermost distance, the R c determined experimentally for the M ϩ -Rg systems agrees well with the sum of the atomic radii r i and r j of the interacting particles i and j, [5][6][7][8] which holds also for molecular collisions.…”

“…[5][6][7][8] With increases in the collision energy and scattering angle, excitations taking place at smaller internuclear distances have been observed. Concerning the transitions occurring at the outermost distance, the R c determined experimentally for the M ϩ -Rg systems agrees well with the sum of the atomic radii r i and r j of the interacting particles i and j, [5][6][7][8] which holds also for molecular collisions. 9 ͓The potential height V(R c ) at R c is 40-65 eV, depending weakly on the systems.͔ [5][6][7][8] The distance R c for M ϩ -Rg is almost the same as that for the quasi-one-electron ͑alkali-atom-rare-gas-atom M-Rg͒ system.…”