L Kristensen et al 2000 J. Phys. B: At. Mol. Opt. Phys. 33 1103 doi:10.1088/0953-4075/33/5/322
L Kristensen
, T Bové
, B D DePaola
, T Ehrenreich
, E Horsdal-Pedersen and O E Povlsen![]()
The total cross section,
, 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,
, 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 ,
) = (0.74-2.09, 0-1, 0-2
). The velocity range includes the region of matching velocities (v r
1) where
for given geometrical parameters attains its maximum value and the high-velocity region where
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
in some region of parameter space (v r ,e ,
) and in another the momentum distribution prevails.
Issue 5 (14 March 2000)
Received 6 December 1999
L Kristensen et al 2000 J. Phys. B: At. Mol. Opt. Phys. 33 1103
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