Experimental study of single, double, and multiple electron capture in slow 15N7++Ne collisions using recoil-ion momentum spectroscopy -: art. no. 012715

Single, double, triple, quadruple, and quintuple capture of electrons in N-15(7+) + Ne collision at the energy of 105 keV have been investigated using recoil-ion momentum spectroscopy. Relative cross sections, stabilization ratios, ratios between single- and multiple-electron capture, along with the branching ratios of subprocesses involved in multiple capture, have been obtained and compared with calculations by the extended classical over-barrier model [A. Niehaus, J. Phys. B 19, 2925 (1986)] and the semiempirical scaling laws [N. Selberg et nl., Phys. Rev. A 54, 4127 (1989)]. For single capture, it state relative populations and projectile scattering angle distributions are given. In the case of double capture, we find the autoionizing double capture dominates and populates the symmetric N5+(3l3l') and near-symmetric N5+(3l4l') state, while the true double capture mainly gives rise to N5+(2lnl') (n>2) configurations. The relative cross sections and stabilization ratios far double electron capture are evaluated. In the more than two-electrons capture, we have obtained stabilization ratios and branching ratios of different subprocesses. The configurations populated by more than two-electron captures have been identified. Our results also show that the electron-electron correlation is important in multiple electron capture.