Differential charge-transfer cross sections for Na⁺ with Rb collisions at low energies

Teck Ghee Lee, Hai Nguyen
(J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506-2601)

Flechard Xavier
(LPC CAEN, BVD du Maréchal Juin, 14050 CAEN CEDEX, France)

Brett Depaola, Chii Dong Lin
(J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506-2601)

J.R. Macdonald Laboratory Collaboration, LPC CAEN Collaboration

We report a theoretical and experimental study of state-selective differential single electron transfer cross sections between Na⁺ ions with Rb(5s,5p) atoms at collision energies of 2, 5, 7 keV. A two-center multi-channels semi-classical impact parameter Close-Coupling method (TC-AOCC) with straight-line trajectories was used to obtain single electron capture amplitudes. By combining with the Eikonal approximation, we calculated the angular differential cross sections. These results are compared to the experimental data obtained with cold Rb targets cooled in a magnetic optical trap (MOT). It is shown that there is a general good agreement between the present calculations and the experiments. Despite of the higher resolution offered from the cold target, the rapid oscillations in the differential cross sections are not resolved by the experiments.

This work was supported by the Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy.

Submitted to DAMOP 2002, May 2002 in Williamsburg, VA.

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