Abstract
Capture cross sections for circular Rydberg states have been measured as a function of the angle, \ensuremath{\varphi}, between ion velocity and angular momentum of the circular orbital. The system studied is 2.5 keV $^{23}\mathrm{Na}^{+}$ on Li(1${\mathit{s}}^{2}$,nlm) with n=25, l=n-1, and m=+l, where m is defined relative to a weak, external magnetic field. A strong dependence on \ensuremath{\varphi} is found. It is expected that studies such as the present will lead to an improved understanding of the three-body problem in the region of sufficiently large quantum numbers and impact velocities for classical physics to be accurate.
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