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Electron correlation in highly-charged-ion collisions.

We have used the coupled-channel method to study the significance of electron correlation in the reaction mechanism for two-electron capture in C{sup 5+}-He collisions. Two different sets of calculations were performed. While the static correlation energy was generally included in the calculations, further correlation effects were ignored in the first set of calculations. In the second set of calculations the so-called doubly excited symmetry basis (DESB) states were used to model the spatial electron correlation. The difference between the two sets of results is so profound that we can conclude that electron correlation plays an essential role in the reaction mechanism. The results of the DESB-based calculations are in good agreement with experimental data (Holt {ital et} {ital al}., Phys. Rev. A 43, 607 (1991)).