Scattering of low energy He2+ ions by Ne,Ar, and Kr atoms |
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Authors: | TM Austin JM Mullen TL Bailey |
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Institution: | Department of Physics, University of Florida, Gainesville, Florida 32611 USA |
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Abstract: | Experimental studies of collisions of He2+ ions with Ne, Ar, and Kr atoms have been carried out at laboratory kinetic energies in the range 8 ? E1 ? 10 eV. For each collision pair, relative differential cross sections for elastic scattering, and for the formation of He+ by single charge transfer e.g., He2+ + R = He+ + (R+)*] were measured. Information concerning the initial states of the charge transfer products was also obtained, from measurements of the kinetic energy distributions of the He+ + He = Ne+(2s 2p62S) ± He+(2S), whereas for the other systems, transfer proceeds via a number of channels. The He+-ion kinetic energy measurements indicated that for He2+. Ar both Ar+ both Ar+ and Ar2+ are formed in transfer, and that for He2+, Kr only Kr2+ (and no Kr+) was formed.The differential elastic scattering patterns were analyzed by means of cross section calculations based on an approximate form of the optical model. These calculations indicated that the pronounced shoulders observed in the σel(θ) versus θ curves arose from scattering from an attractive potential well, in the presence of concurrent inelastic scattering. Using parametrized Morse potentials to represent the ground electronic states of (HeNe)2+, (HeAr)2+, and (HeKr)2+, the corresponding well-depth are estimated to be, respectively: 1.0 eV, 2.1 eV and 2.6 eV. |
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