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Electron capture cross sections for coherent elliptic Rydberg states have been measured as a function of eccentricity. The ion impact velocity was parallel to the minor axis of the associated, classical elliptic orbit and both clockwise and anticlockwise orbital motion of the electron were studied. The incoming ions were 2.5 keV 23Na+ and the Rydberg target, with principal quantum number n=25, was formed by laser excitation of Li atoms with subsequent adiabatic switching of crossed, external electric and magnetic fields. A strong dependence on eccentricity and sense of orbital motion was found.

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Relative measurements of total charge lransfer in Nat+ Na(n,/) collisions at 30 to 2000 eV for selected s and d Rydberg states. nj = 22-41. are reported. The cross sections fall off with increasing reduced velocity (a= vjan/uc) more gradually than H + + H ( l s ) capture below a= 1. The mean functional dependence agrees with classical trajectory Monte Carlo (CTMC) calculations, but previously unreported bumps occur at reduced velocities near 0.5 and 0.8. The validity of high-n CTMC calculations for low reduced velocity is discussed.

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