Dielectronic processes producing radiative stabilization in slow Ne10++He collisions.

Abstract

Different contributions to radiative stabilization in ${\mathrm{Ne}}^{10+}$+He collisions at projectile energies of 10 and 150 keV are studied. For both energies, radiative stabilization is found to be equal to \ensuremath{\approxeq}0.3 when referred to the total double capture. In ${\mathrm{Ne}}^{10+}$+He collisions doubly excited states 3${\mathit{lnl}}^{\ensuremath{'}}$ and 4${\mathit{lnl}}^{\ensuremath{'}}$ (n\ensuremath{\ge}4) are either produced by uncorrelated two-electron transitions or by dielectronic mechanisms due to electron-electron interaction. A strong contribution (\ensuremath{\approxeq}0.15) to the stabilization follows from the decay of near-equivalent electrons 3${\mathit{lnl}}^{\ensuremath{'}}$ and 4${\mathit{lnl}}^{\ensuremath{'}}$(n=4,5). Another major contribution (0.10--0.25) to stabilization is due to the decay of configurations 3${\mathit{lnl}}^{\ensuremath{'}}$ (n\ensuremath{\ge}6) of nonequivalent electrons produced by the dielectronic process of autoexcitation. A small contribution is found to be due to the configurations 3${\mathit{lnl}}^{\ensuremath{'}}$ (n\ensuremath{\gtrsim}9) created by dielectronic phenomena in the postcollisional and asymptotic regions (\ensuremath{\approxeq}0.04). \textcopyright{} 1996 The American Physical Society.