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Electron capture from elliptic Rydberg states: impact perpendicular to the minor axis

L Kristensen-+, T Bové-+, B D DePaola++, T Ehrenreich++, E Horsdal-Pedersen and O E Povlsen-+

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The total cross section, sigma , for electron capture by Na+ ions from oriented coherent elliptic states (CES) of Li with principal quantum number n = 25 was studied experimentally for impact perpendicular to the minor axis of the elliptic orbit. The remaining geometrical parameters of the CES, which are the eccentricity, e , and the angle, varphi , between the major axis and the beam direction, were varied in the course of the experiments, as was the reduced impact velocity v r = nv , where v is the projectile velocity in atomic units. Several representative cuts were chosen within the parameter space (v r ,e ,varphi ) = (0.74-2.09, 0-1, 0-2pi ). The velocity range includes the region of matching velocities (v r simeq 1) where sigma for given geometrical parameters attains its maximum value and the high-velocity region where sigma is a strongly decreasing function of v r . The cross section depends sensitively on each geometrical parameter, and the dependences change dramatically as v r is varied. The spatial distribution of the CES apparently governs sigma in some region of parameter space (v r ,e ,varphi ) and in another the momentum distribution prevails.


PACS

34.70.+e Charge transfer

34.10.+x General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.)

34.50.-s Scattering of atoms and molecules

Subjects

Atomic and molecular physics

Dates

Issue 5 (14 March 2000)

Received 6 December 1999



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