Excitation Mechanisms in Moderate-Energy Cs

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Excitation processes in Cs+--Ar collisions were studied at laboratory collision energies of 200 \leq E_{\text{lab}} \leq 1000 eV by means of differential scattering spectroscopy. Extensive measurements were performed at the energy of E_{\text{lab}}=650 eV. Doubly differential cross sections \sigma(\Theta)_{k} were measured over a wide range of center-of-mass scattering angles, 8.5 \leq \Theta \leq 176°, by detecting all the scattered particles (Cs+, Cs, Ar+, and Ar), where subscript k means the number of exit channels in the reactions. Excitations of one- and two-electron processes were observed appreciably at the collision energies of E_{\text{lab}} \geq 400 eV. The excitation processes are predominantly due to the two-electron transition, which is markedly different from the excitations for other collision systems between closed-shell particles studied previously. The analysis of the experimental results shows that the electronic transitions take place at the internuclear distances of R< R_{\text{C}} = 1.17\times 10^{-10} m, where the potential V(R) > 91 eV.
2013-12-15